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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating activities:      
Net income $ 107,835,000 $ 127,149,000 $ 130,023,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 27,959,000 17,318,000 22,812,000
Specific reserve, other real estate owned 1,776,000 9,806,000 657,000
Accretion of time deposit discounts   (11,000) (14,000)
Depreciation of bank premises and equipment 26,756,000 34,935,000 35,395,000
Gain on sale of bank premises and equipment (538,000) (361,000) (22,000)
Loss (gain) on sale of other real estate owned 488,000 (738,000) (266,000)
Accretion of investment securities discounts (3,195,000) (2,081,000) (1,693,000)
Amortization of investment securities premiums 30,501,000 18,362,000 13,211,000
Investment securities transactions, net (38,446,000) (17,285,000) (33,209,000)
Impairment charges on available for sale securities 1,039,000 977,000 8,416,000
Accretion of junior subordinated debenture discounts   9,000 35,000
Amortization of identified intangible assets 4,651,000 5,293,000 5,284,000
Stock based compensation expense 474,000 387,000 534,000
Earnings from affiliates and other investments (9,892,000) (11,633,000) (15,023,000)
Deferred tax expense (benefit) 7,923,000 (2,299,000) (3,532,000)
Decrease in accrued interest receivable 968,000 3,658,000 6,071,000
(Increase) decrease in other assets (5,392,000) 2,303,000 7,824,000
Increase (decrease) in other liabilities 7,106,000 (4,966,000) 1,652,000
Net cash provided by operating activities 160,013,000 180,823,000 178,155,000
Investing activities:      
Proceeds from maturities of securities 1,125,000 1,425,000 4,423,000
Proceeds from sales and calls of available for sale securities 1,382,231,000 1,102,849,000 1,149,021,000
Purchases of available for sale securities (3,081,034,000) (2,231,330,000) (2,666,596,000)
Principal collected on mortgage backed securities 1,294,197,000 999,419,000 1,085,817,000
Net decrease in loans 170,072,000 306,915,000 164,241,000
Purchases of other investments (4,228,000) (11,941,000) (7,438,000)
(Contributions) distributions from other investments (7,410,000) 33,320,000 20,910,000
Purchases of bank premises and equipment (62,030,000) (20,393,000) (15,953,000)
Proceeds from sales of bank premises and equipment 7,575,000 1,719,000 2,005,000
Proceeds from sales of other real estate owned 38,766,000 25,324,000 8,362,000
Purchase of identified intangible asset (280,000) (174,000) (235,000)
Net cash (used in) provided by investing activities (261,016,000) 207,133,000 (255,443,000)
Financing activities:      
Net increase in non-interest bearing demand deposits 538,732,000 287,942,000 122,277,000
Net increase in savings and interest bearing demand deposits 159,458,000 184,851,000 260,290,000
Net (decrease) increase in time deposits (357,069,000) (126,248,000) 38,998,000
Net decrease in securities sold under repurchase agreements (218,950,000) (84,641,000) (8,547,000)
Other borrowed funds, net 254,866,000 (532,619,000) (320,845,000)
Repayment of long-term debt   (10,400,000)  
Purchase of treasury stock (1,716,000) (6,435,000) (6,949,000)
Redemption of Series A preferred shares (216,000,000)    
Proceeds from stock transactions 51,000 113,000 484,000
Payments of cash dividends - common (26,894,000) (25,648,000) (24,444,000)
Payments of cash dividends - preferred (10,260,000) (10,800,000) (10,800,000)
Net cash provided by (used in) financing activities 122,218,000 (323,885,000) 50,464,000
Increase (decrease) in cash and cash equivalents 21,215,000 64,071,000 (26,824,000)
Cash and cash equivalents at beginning of year 261,885,000 197,814,000 224,638,000
Cash and cash equivalents at end of year 283,100,000 261,885,000 197,814,000
Supplemental cash flow information:      
Interest paid 77,431,000 97,699,000 116,037,000
Income taxes paid 36,303,000 60,922,000 78,435,000
Non-cash investing and financing activities:      
Purchases of available-for-sale securities not yet settled   72,538,000 160,216,000
Net transfers from loans to other real estate owned 54,441,000 32,005,000 59,429,000
Accrued dividends, preferred shares   $ 1,350,000 $ 1,350,000