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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net income $ 215,931,000 $ 157,436,000 $ 133,932,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 6,112,000 11,221,000 19,859,000
Specific reserve, other real estate owned 3,071,000 710,000 2,351,000
Depreciation of bank premises and equipment 25,873,000 25,281,000 24,738,000
Gain on sale of bank premises and equipment (1,456,000) (38,000) (450,000)
Gain (loss) on sale of other real estate owned (1,465,000) (703,000) 86,000
Accretion of investment securities discounts (271,000) (393,000) (539,000)
Amortization of investment securities premiums 20,087,000 24,040,000 26,873,000
Investment securities transactions, net 141,000 4,774,000 2,626,000
Impairment charges on available for sale securities     354,000
Unrealized loss on equity securities with readily determinable fair values 388,000    
Amortization of identified intangible assets   25,000 128,000
Stock based compensation expense 1,035,000 903,000 1,082,000
Earnings from affiliates and other investments (15,484,000) (13,198,000) (14,315,000)
Deferred tax expense 5,143,000 4,570,000 7,306,000
Increase in accrued interest receivable (2,347,000) (2,284,000) (600,000)
(Increase) decrease in other assets (51,827,000) (16,117,000) 7,494,000
Net increase (decrease) in other liabilities 24,916,000 592,000 (7,705,000)
Net cash provided by operating activities 229,847,000 196,819,000 203,220,000
Investing activities:      
Proceeds from maturities of securities 2,275,000   1,200,000
Proceeds from sales and calls of available for sale securities 38,175,000 396,066,000 352,743,000
Proceeds from sales of equity securities with readily determinable fair values 21,607,000    
Purchases of available for sale securities (47,346,000) (1,182,006,000) (1,325,657,000)
Principal collected on mortgage backed securities 675,304,000 780,097,000 919,594,000
Net increase in loans (258,142,000) (394,267,000) (38,523,000)
Purchases of other investments (43,418,000) (26,193,000) (49,013,000)
Distributions from other investments 3,668,000 20,344,000 23,276,000
Purchases of bank premises and equipment (21,395,000) (14,315,000) (38,856,000)
Proceeds from sales of bank premises and equipment 4,533,000 2,201,000 3,701,000
Proceeds from sales of other real estate owned 4,179,000 14,266,000 13,772,000
Net cash provided by (used in) investing activities 379,440,000 (403,807,000) (137,763,000)
Financing activities:      
Net increase in non-interest bearing demand deposits 211,585,000 85,204,000 8,433,000
Net increase in savings and interest bearing demand deposits 23,106,000 41,403,000 183,506,000
Net decrease in time deposits (83,038,000) (191,804,000) (118,103,000)
Net decrease in securities sold under repurchase agreements (123,816,000) (151,180,000) (322,787,000)
Net (decrease) increase in other borrowed funds (489,560,000) 461,850,000 227,625,000
Redemption of long-term debt     (1,000,000)
Repurchase of outstanding common stock warrant (29,005,000)    
Purchase of treasury stock (19,042,000) (187,000) (7,966,000)
Proceeds from stock transactions 1,522,000 1,455,000 549,000
Payments of cash dividends - common (49,599,000) (43,594,000) (39,569,000)
Net cash (used in) provided by financing activities (557,847,000) 203,147,000 (69,312,000)
Increase (decrease) in cash and cash equivalents 51,440,000 (3,841,000) (3,855,000)
Cash and cash equivalents at beginning of period 265,357,000 269,198,000 273,053,000
Cash and cash equivalents at end of period 316,797,000 265,357,000 269,198,000
Supplemental cash flow information:      
Interest paid 50,623,000 38,995,000 44,069,000
Income taxes paid 40,565,000 66,983,000 49,925,000
Non-cash investing and financing activities:      
Net transfers from loans to other real estate owned $ 32,610,000 $ 2,588,000 $ 2,563,000