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Consolidated Statements of Cash Flows (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Operating activities:    
Net income $ 66,145 $ 66,054
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for probable loan losses 2,163 8,658
Accretion of time deposit discounts (7) (7)
Depreciation of bank premises and equipment 16,258 17,981
Gain on sale of bank premises and equipment (332) (192)
Accretion of investment securities discounts (870) (793)
Amortization of investment securities premiums 10,223 4,940
Investment securities transactions, net (2,861) (30,837)
Impairment charges on available-for-sale investment securities 415 7,461
Amortization of junior subordinated debenture discounts 9 18
Amortization of identified intangible assets 2,626 2,625
Stock based compensation expense 195 297
Earnings from affiliates and other investments (8,980) (6,490)
Deferred tax benefit (2,283) (10,374)
Decrease in accrued interest receivable 1,691 2,599
Net decrease (increase) in other assets 7,149 5,867
Net increase in other liabilities 2,942 28,448
Net cash provided by operating activities 94,483 96,255
Investing activities:    
Proceeds from maturities of securities 500 600
Proceeds from sales and calls of available for sale securities 774,856 1,051,172
Purchases of available for sale securities (1,331,496) (1,238,690)
Principal collected on mortgage-backed securities 497,445 458,264
Net decrease in loans 104,376 89,232
Purchases of other investments (2,173) (1,014)
Distributions of other investments 13,556 43,912
Purchases of bank premises and equipment (9,018) (8,553)
Proceeds from sale of bank premises and equipment 1,109 1,678
Net cash provided by investing activities 49,155 396,601
Financing activities:    
Net increase in non-interest bearing demand deposits 107,280 44,561
Net increase in savings and interest bearing demand deposits 149,421 121,767
Net (decrease) increase in time deposits (69,367) 135,544
Net (decrease) increase in securities sold under repurchase agreements (9,681) 48,700
Net decrease in other borrowed funds (270,879) (804,125)
Repayment of long-term debt (5,200)  
Purchase of treasury stock (2,951) (2,663)
Proceeds from stock transactions 110 1
Payments of dividends on common stock (12,863) (11,578)
Payments of dividends on preferred stock (5,400) (5,400)
Net cash used in financing activities (119,530) (473,193)
Increase in cash and cash equivalents 24,108 19,663
Cash and cash equivalents at beginning of period 197,814 224,638
Cash and cash equivalents at end of period 221,922 244,301
Supplemental cash flow information:    
Interest paid 52,494 60,729
Income taxes paid 42,773 45,552
Accrued dividends, preferred shares 1,350 1,350
Sales of available-for-sale securities not yet settled   15,271
Net transfer from loans to other real estate owned 41,280 25,724
Purchases of available-for-sale securities not yet settled   28,269
Accrued partial redemption of trust preferred securities, IB Capital Trust I $ 5,200