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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 157,436 $ 133,932 $ 136,726
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 11,221 19,859 24,405
Specific reserve, other real estate owned 710 2,351 1,023
Depreciation of bank premises and equipment 25,281 24,738 25,009
(Gain) loss on sale of bank premises and equipment (38) (450) 14
(Gain) loss on sale of other real estate owned (703) 86 (57)
Accretion of investment securities discounts (393) (539) (1,704)
Amortization of investment securities premiums 24,040 26,873 28,000
Investment securities transactions, net 4,774 2,626 3,682
Impairment charges on available for sale securities   354 954
Amortization of identified intangible assets 25 128 644
Stock based compensation expense 903 1,082 1,172
Earnings from affiliates and other investments (13,198) (14,315) (12,176)
Deferred tax expense (benefit) 4,570 7,306 (332)
Increase in accrued interest receivable (2,284) (600) (111)
(Increase) decrease in other assets (16,117) 7,494 2,967
Net increase (decrease)in other liabilities 592 (7,705) (6,567)
Net cash provided by operating activities 196,819 203,220 203,649
Investing activities:      
Proceeds from maturities of securities   1,200 1,075
Proceeds from sales and calls of available for sale securities 396,066 352,743 164,163
Purchases of available for sale securities (1,182,006) (1,325,657) (352,513)
Principal collected on mortgage backed securities 780,097 919,594 854,736
Net increase in loans (394,267) (38,523) (297,689)
Purchases of other investments (26,193) (49,013) (16,355)
Distributions from other investments 20,344 23,276 18,293
Purchases of bank premises and equipment (14,315) (38,856) (19,831)
Proceeds from sales of bank premises and equipment 2,201 3,701 4,515
Proceeds from sales of other real estate owned 14,266 13,772 16,831
Net cash (used in) provided by investing activities (403,807) (137,763) 373,225
Financing activities:      
Net increase in non-interest bearing demand deposits 85,204 8,433 219,365
Net increase (decrease) in savings and interest bearing demand deposits 41,403 183,506 (5,458)
Net decrease in time deposits (191,804) (118,103) (116,279)
Net decrease in securities sold under repurchase agreements (151,180) (322,787) (30,578)
Net increase (decrease) in other borrowed funds 461,850 227,625 (568,194)
Redemption of long-term debt   (1,000) (14,000)
Purchase of treasury stock (187) (7,966) (6,678)
Proceeds from stock transactions 1,455 549 1,370
Payments of cash dividends - common (43,594) (39,569) (38,515)
Net cash provided by (used in) financing activities 203,147 (69,312) (558,967)
(Decrease) increase in cash and cash equivalents (3,841) (3,855) 17,907
Cash and cash equivalents at beginning of period 269,198 273,053  
Cash and cash equivalents at end of period 265,357 269,198 273,053
Supplemental cash flow information:      
Interest paid 38,995 44,069 44,560
Income taxes paid 66,983 49,925 65,234
Non-cash investing and financing activities:      
Net transfers from loans to other real estate owned $ 2,588 $ 2,563 $ 3,775