Document and Entity Information Document and Entity Information Statement [Table] Legal Entity [Axis] Entity [Domain] Parent Company [Member] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Trading Symbol Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Assets Cash and due from banks Cash and Due from Banks, Total Interest-bearing deposits with banks Federal funds sold and securities purchased under resale agreements or similar arrangements Federal Funds Sold and Securities Purchased under Agreements to Resell, Total Segregated cash due from banks Trading securities at fair value Trading Securities, Total Securities available for sale at fair value ($1,263 and $1,201 covered by FDIC loss share at March 31,2010 and December 31, 2009,respectively) Available-for-sale Securities, Total Loans held for sale at fair value Loans Receivable Held-for-sale, Net, Ending Balance Loans Receivable Held-for-sale, Net, Beginning Balance Loans Receivable Held-for-sale, Net, Total Loans and leases ($7,458 and $8,019 covered by FDIC loss share at March 31,2010 and December 31, 2009,respectively) Loans and Leases Receivable, Net of Deferred Income, Total Allowance for loan and lease losses Allowance for loan and lease losses Loans and Leases Receivable, Allowance, Ending Balance Loans and Leases Receivable, Allowance, Beginning Balance Loans and Leases Receivable, Allowance, Total Loans and leases, net of allowance for loan and lease losses Loans and leases, net of allowance for loan and lease losses FDIC loss share receivable FDIC loss share receivable Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Premises and equipment Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Core deposit and other intangible assets Intangible Assets, Net (Excluding Goodwill), Total Residential mortgage servicing rights at fair value Servicing Asset at Fair Value, Amount, Ending Balance Servicing Asset at Fair Value, Amount, Beginning Balance Other assets ($229 and $215 of foreclosed property and other assets covered by FDIC loss share at March 31, 2010 and December 31, 2009, respectively) Other Assets, Total Total assets Total assets Liabilities and Shareholders' Equity Deposits: Noninterest-bearing deposits Noninterest-bearing Deposit Liabilities, Total Interest checking Other client deposits The aggregate amount of time deposits, including certificates of deposits, individual retirement accounts and open accounts, excluding wholesale certificates of deposits. Client certificates of deposit Other interest-bearing deposits Total deposits Total deposits Federal funds purchased, securities sold under repurchase agreements and short-term borrowed funds Short-term Borrowings, Total Long-term debt Long-term Debt, Total Accounts payable and other liabilities Other Liabilities, Total Total liabilities Total liabilities Commitments and contingencies 2009 Commitments and contingencies (Note 13) Shareholders' equity: Preferred stock, liquidation preference of $1,000,000 per share Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Common stock, $5 par Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained earnings Accumulated other comprehensive loss, net of deferred income taxes of $(183) and $(257) at March 31, 2010 and December 31, 2009, respectively Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Total Noncontrolling interest Total shareholders' equity Ending Balance Beginning Balance Total shareholders' equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Common shares outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common shares authorized Preferred shares authorized Securities available for sale at fair value, covered by FDIC loss share Securities available for sale at fair value, covered by FDIC loss share Loans And Leases Covered By FDIC Loss Share Loans and leases covered by FDIC loss share Other Assets Foreclosed Property And Other Assets Covered By FDIC Loss Share Other assets: foreclosed property and other assets covered by FDIC loss share Preferred stock, liquidation preference per share Common stock, par Accumulated other comprehensive loss, deferred income taxes Income Statement [Abstract] Interest Income Interest and fees on loans and leases Interest and Fee Income, Loans and Leases, Total Interest and dividends on securities Interest and Dividend Income, Securities, Total Interest on other earning assets Total interest income Total interest income Interest Expense Interest on deposits Interest Expense, Deposits, Total Interest on federal funds purchased, securities sold under repurchase agreements and short-term borrowed funds Interest Expense, Short-term Borrowings, Total Interest on long-term debt Interest Expense, Long-term Debt, Total Total interest expense Total interest expense Net Interest Income Net Interest Income Provision for credit losses Provision for Loan, Lease, and Other Losses, Total Net Interest Income After Provision for Credit Losses Net Interest Income After Provision for Credit Losses Noninterest Income Insurance income Service charges on deposits The noninterest income derived from mortgage banking activities (fees and commissions), including fees earned from servicing third party assets. Mortgage banking income Investment banking and brokerage fees and commissions Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions, Total Other nondeposit fees and commissions Income earned from debit cards, such as interchange from point of sale purchases and fees for withdrawals at foreign ATMs. Fees And Commissions Credit And Debit Cards Checkcard fees Checkcard fees Bankcard fees and merchant discounts Trust and investment advisory revenues Fees and Commissions, Fiduciary and Trust Activities, Total Income from bank-owned life insurance Other income Securities gains (losses), net Realized gains (losses), net Marketable Securities, Realized Gain (Loss), Total Other-than-temporary impairments Other-than-temporary impairments Amount of unrealized losses of other than temporarily impaired securities that are non-credit related. These amounts are recognized as a component of other comprehensive income. Noncredit Portion Of Other Than Temporary Impairments Less non-credit portion recognized in other comprehensive income (Gain) loss on sales of securities, net Loss (gain) on sales of securities, net Total securities (losses) gains, net Total noninterest income Total noninterest income Noninterest Expense Personnel expense Labor and Related Expense, Total Foreclosed property expense Occupancy and equipment expense Professional services Regulatory charges includes FDIC insurance expense and examination and other fees paid to federal and state regulatory authorities. Regulatory Assessments Regulatory charges Loan processing expenses Amortization of intangibles Amortization of Intangible Assets, Total Merger-related and restructuring charges, net Restructuring Charges, Total Other expenses Total noninterest expense Total noninterest expense Earnings Income before income taxes Income before income taxes Provision for income taxes Income Tax Expense (Benefit), Total Net income Net income Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Noncontrolling interest Dividends and accretion on preferred stock Preferred Stock Dividends and Other Adjustments, Total Net income available to common shareholders Net income available to common shareholders Earnings Per Common Share Earnings Per Share, Basic Earnings Per Share, Basic, Total Basic Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Diluted Cash dividends declared Cash dividends declared on common stock, per share Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic, Total Basic Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Diluted Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Common Stock Preferred Stock Additional Paid-In Capital Retained Earnings Accumulated Other Comprehensive Income (Loss) Noncontrolling Interest Number of shares of stock held by shareholders. Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Add (Deduct): Comprehensive income (loss): Net change in other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Total Total comprehensive income (loss) (Note 12) Total comprehensive income (loss) (Note 10) Stock Transactions [Abstract] Stock Transactions [Abstract] Stock issued: In purchase acquisitions (in shares) In purchase acquisitions In connection with stock option exercises and other employee benefits, net of cancellations (in shares) In connection with stock option exercises and other employee benefits, net of cancellations In connection with dividend reinvestment plan (in shares) In connection with dividend reinvestment plan Number of shares issued during the period to employees related to the company's ESOP and 401(k) plans. Stock Issued During Period Shares Esop 401k Contribution In connection with 401(k) plan (in shares) Stock Issued During Period Value ESOP 401K Contribution Stock Issued During Period Value ESOP 401K Contribution In connection with 401(k) plan Cash dividends declared on common stock, $.92 in 2009, $1.87 in 2008, and $1.80 in 2007 per share Cash dividends declared on common stock Cash dividends accrued on preferred stock Cash dividends accrued on preferred stock Equity-based compensation expense Stockholders' Equity, Other Other, net Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Adjustments to reconcile net income to net cash provided by (used in) operating activities: Depreciation Equity-based compensation Share-based Compensation, Total Discount accretion and premium amortization on long-term debt, net Net (increase) decrease in trading account securities Net increase in trading securities Increase (Decrease) in Trading Securities, Total Net increase in loans held for sale Net decrease (increase) in loans held for sale Increase (Decrease) in Loans Held-for-sale, Total The net change during the reporting period in the balance of the FDIC Loss Share Receivable. Net decrease in FDIC loss share receivable Net decrease in FDIC loss share receivable Net increase in other assets Net increase in other assets Net decrease in accounts payable and other liabilities Increase (Decrease) in Operating Liabilities, Total Decrease Increase In Segregated Cash Due From Banks Decrease Increase In Segregated Cash Due From Banks Decrease in segregated cash due from banks Increase (Decrease) in Other Operating Assets and Liabilities, Net Other, net Net cash (used in) provided by operating activities Net cash provided by (used in) operating activities Cash Flows From Investing Activities: Proceeds from sales of securities available for sale Proceeds from Sale of Available-for-sale Securities, Total Proceeds from maturities, calls and paydowns of securities available for sale Purchases of securities available for sale Purchases of securities available for sale Payments to Acquire Available-for-sale Securities, Total Originations and purchases of loans and leases, net of principal collected Originations and purchases of loans and leases, net of principal collected Payments for (Proceeds from) Loans and Leases, Total Net cash paid for divestitures Proceeds from Divestiture of Businesses, Net of Cash Divested Proceeds from Divestiture of Businesses, Net of Cash Divested, Total Net cash acquired (paid) in business combinations Net cash paid in business combinations Payments to Acquire Businesses, Net of Cash Acquired, Total Proceeds from disposals of premises and equipment Proceeds from Sale of Property, Plant, and Equipment, Total Purchases of premises and equipment Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment, Total Proceeds from sales of foreclosed property or other real estate held for sale Payments for (Proceeds from) Other Investing Activities Other, net Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Cash Flows From Financing Activities: Net decrease in deposits Increase (Decrease) in Deposits, Total Net (decrease) increase in federal funds purchased, securities sold under repurchase agreements and short-term borrowed funds Proceeds from (Repayments of) Other Debt, Total Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt, Total Repayment of long-term debt Repayment of long-term debt Repayments of Long-term Debt, Total Net proceeds from common stock issued Cash dividends paid on common stock Cash dividends paid on common stock Cash dividends paid on preferred stock Cash dividends paid on preferred stock Other, net Net cash (used in) provided by financing activities Net cash (used in) financing activities Net (Decrease) Increase in Cash and Cash Equivalents Net Decrease in Cash and Cash Equivalents Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents at End of Period Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents, at Carrying Value, Total Supplemental Disclosure of Cash Flow Information: Cash Paid During Period For [Abstract] Cash Paid During Period For [Abstract] Cash paid during the period for: Interest Interest Paid, Net, Total Income Taxes Paid, Net Income Taxes Paid, Net, Total Income taxes Noncash investing and financing activities: Transfer of loans to foreclosed property Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Basis of Presentation Business Combinations Securities