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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities:      
Net income $ 127,149 $ 130,023 $ 142,742
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 17,318 22,812 58,833
Specific reserve, other real estate owned 9,806 657 44
Accretion of time deposit discounts (11) (14) (14)
Depreciation of bank premises and equipment 34,935 35,395 35,879
(Gain) loss on sale of bank premises and equipment (361) (22) 80
Gain on sale of other real estate owned (738) (266) (291)
Depreciation and amortization of leased assets     300
Accretion of investment securities discounts (2,081) (1,693) (1,940)
Amortization of investment securities premiums 18,362 13,211 6,911
Investment securities transactions, net (17,285) (33,209) (11,956)
Impairment charges on available for sale securities 977 8,416  
Accretion of junior subordinated debenture discounts 9 35 34
Amortization of identified intangible assets 5,293 5,284 5,286
Stock based compensation expense 387 534 655
Earnings from affiliates and other investments (11,633) (15,023) (16,891)
Deferred tax benefit (2,299) (3,532) (3,035)
Decrease in accrued interest receivable 3,658 6,071 6,981
Decrease (increase) in other assets 3,376 7,824 (28,656)
(Decrease) increase in other liabilities (4,966) 1,652 (12,253)
Net cash provided by operating activities 181,896 178,155 182,709
Investing activities:      
Proceeds from maturities of securities 1,425 4,423 1,637
Proceeds from sales and calls of available for sale securities 1,102,849 1,149,021 579,099
Purchases of available for sale securities (2,231,330) (2,666,596) (1,280,925)
Principal collected on mortgage backed securities 999,419 1,085,817 1,224,938
Proceeds from matured time deposits with banks     396
Net decrease in loans 317,718 164,241 112,663
Purchases of other investments (11,941) (7,438) (11,430)
Distributions from other investments 33,320 20,910 56,988
Purchases of bank premises and equipment (20,393) (15,953) (61,015)
Proceeds from sales of bank premises and equipment 1,719 2,005 1,052
Proceeds from sales of other real estate owned 13,448 8,362 15,066
Purchase, adjustment of identified intangible asset (174) (235) (259)
Net cash provided by (used in) investing activities 206,060 (255,443) 638,210
Financing activities:      
Net increase in non-interest bearing demand deposits 287,942 122,277 57,129
Net increase in savings and interest bearing demand deposits 184,851 260,290 180,950
Net (decrease) increase in time deposits (126,248) 38,998 81,158
Net (decrease) increase in securities sold under repurchase agreements (84,641) (8,547) 686
Other borrowed funds, net (532,619) (320,845) (1,175,361)
Repayment of long-term debt (10,400)    
Purchase of treasury stock (6,435) (6,949) (9,346)
Proceeds from stock transactions 113 484 2,705
Payments of cash dividends-common (25,648) (24,444) (23,262)
Payments of cash dividends-preferred (10,800) (10,800) (9,660)
Net cash (used in) provided by financing activities (323,885) 50,464 (895,001)
Increase (decrease) in cash and cash equivalents 64,071 (26,824) (74,082)
Cash and cash equivalents at beginning of year 197,814 224,638 298,720
Cash and cash equivalents at end of year 261,885 197,814 224,638
Supplemental cash flow information:      
Interest paid 97,699 116,037 146,778
Income taxes paid 60,922 78,435 83,830
Purchases of available-for-sale securities not yet settled 72,538 160,216 100,829
Net transfers from loans to other real estate owned 21,202 59,429 22,487
Accrued dividends, preferred shares $ 1,350 $ 1,350 $ 1,350