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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating activities:    
Net income $ 82,115 $ 96,776
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for probable loan losses 16,741 7,833
Specific reserve, other real estate owned 2,032 8,075
Accretion of time deposit discounts   (11)
Depreciation of bank premises and equipment 20,335 24,749
Gain on sale of bank premises and equipment (734) (267)
Gain on sale of other real estate owned (239) (49)
Accretion of investment securities discounts (2,346) (1,387)
Amortization of investment securities premiums 20,290 13,968
Investment securities transactions (35,527) (9,448)
Impairment charges on available-for-sale investment securities 647 701
Amortization of junior subordinated debenture discounts   9
Amortization of identified intangible assets 3,463 3,950
Stock based compensation expense 366 280
Earnings from affiliates and other investments (8,836) (11,542)
Deferred tax expense 2,267 766
Decrease in accrued interest receivable 1,516 5,481
Net (increase) decrease in other assets (271) 48,944
Net increase in other liabilities 16,793 7,976
Net cash provided by operating activities 118,612 196,804
Investing activities:    
Proceeds from maturities of held-to-maturity securities 1,125 1,300
Proceeds from sales and calls of available for sale securities 1,279,963 926,869
Purchases of available for sale securities (2,383,774) (1,596,603)
Principal collected on mortgage-backed securities 955,550 703,618
Net decrease in loans 86,501 181,902
Purchases of other investments (2,956) (1,941)
Distributions received on other investments 8,845 23,504
Purchases of bank premises and equipment (23,650) (13,450)
Proceeds from sales of other real estate owned 25,643 7,477
Proceeds from sale of bank premises and equipment 3,795 1,180
Net cash (used in) provided by investing activities (48,958) 233,856
Financing activities:    
Net increase in non-interest bearing demand deposits 182,477 163,707
Net (decrease) increase in savings and interest bearing demand deposits (22,938) 102,312
Net decrease in time deposits (114,460) (111,980)
Net decrease in securities sold under repurchase agreements (175,017) (46,453)
Net increase (decrease) in other borrowed funds 120,900 (469,036)
Repayment of long-term debt   (10,400)
Purchase of treasury stock (1,092) (6,333)
Redemption of senior preferred shares (40,000)  
Proceeds from stock transactions 43 112
Payments of dividends on common stock (13,450) (12,864)
Payments of dividends on preferred stock (7,911) (8,100)
Net cash used in financing activities (71,448) (399,035)
(Decrease) increase in cash and cash equivalents (1,794) 31,625
Cash and cash equivalents at beginning of period 261,885 197,814
Cash and cash equivalents at end of period 260,091 229,439
Supplemental cash flow information:    
Interest paid 60,651 75,533
Income taxes paid 22,271 45,022
Non-cash investing and financing activities:    
Accrued dividends, preferred shares 1,100 1,350
Dividends declared, not yet paid on common stock 13,445 12,784
Net transfer from loans to other real estate owned 55,694 46,119
Purchases of available-for-sale securities not yet settled 442,240  
Sales of securities available-for-sale not yet settled   $ 2,027