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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net income $ 133,932,000 $ 136,726,000 $ 153,151,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for probable loan losses 19,859,000 24,405,000 14,423,000
Specific reserve, other real estate owned 2,351,000 1,023,000 779,000
Depreciation of bank premises and equipment 24,738,000 25,009,000 24,013,000
(Gain) loss on sale of bank premises and equipment (450,000) 14,000 (3,658,000)
Loss (gain) on sale of other real estate owned 86,000 (57,000) (933,000)
Accretion of investment securities discounts (539,000) (1,704,000) (2,608,000)
Amortization of investment securities premiums 26,873,000 28,000,000 26,729,000
Investment securities transactions, net 2,626,000 3,682,000 (1,283,000)
Impairment charges on available for sale securities 354,000 954,000 817,000
Amortization of identified intangible assets 128,000 644,000 2,389,000
Stock based compensation expense 1,082,000 1,172,000 1,058,000
Earnings from affiliates and other investments (14,315,000) (12,176,000) (10,903,000)
Deferred tax expense (benefit) 7,306,000 (332,000) (1,027,000)
Increase in accrued interest receivable (600,000) (111,000) (807,000)
Decrease (increase) in other assets 7,494,000 2,967,000 (1,621,000)
Net increase in other liabilities (7,705,000) (6,567,000) (7,482,000)
Net cash provided by operating activities 203,220,000 203,649,000 193,037,000
Investing activities:      
Proceeds from maturities of securities 1,200,000 1,075,000  
Proceeds from sales and calls of available for sale securities 352,743,000 164,163,000 621,588,000
Purchases of available for sale securities (1,325,657,000) (352,513,000) (971,358,000)
Principal collected on mortgage-backed securities 919,594,000 854,736,000 787,361,000
Net increase in loans (38,523,000) (297,689,000) (502,129,000)
Purchases of other investments (49,013,000) (16,355,000) (20,602,000)
Distributions from other investments 23,276,000 18,293,000 18,152,000
Purchases of bank premises and equipment (38,856,000) (19,831,000) (50,360,000)
Proceeds from sales of bank premises and equipment 3,701,000 4,515,000 8,424,000
Proceeds from sales of other real estate owned 13,772,000 16,831,000 18,525,000
Net cash (used in) provided by investing activities (137,763,000) 373,225,000 (90,399,000)
Financing activities:      
Net increase in non-interest bearing demand deposits 8,433,000 219,365,000 263,743,000
Net increase (decrease) in savings and interest bearing demand deposits 183,506,000 (5,458,000) 100,068,000
Net decrease in time deposits (118,103,000) (116,279,000) (168,611,000)
Net decrease in securities sold under repurchase agreements (322,787,000) (30,578,000) (99,031,000)
Net increase (decrease) in other borrowed funds 227,625,000 (568,194,000) (150,006,000)
Redemption of long-term debt (1,000,000) (14,000,000) (15,310,000)
Purchase of treasury stock (7,966,000) (6,678,000) (18,923,000)
Proceeds from stock transactions 549,000 1,370,000 555,000
Payments of cash dividends - common (39,569,000) (38,515,000) (34,762,000)
Net cash used in financing activities (69,312,000) (558,967,000) (122,277,000)
(Decrease) increase in cash and cash equivalents (3,855,000) 17,907,000 (19,639,000)
Cash and cash equivalents at beginning of period 273,053,000 255,146,000 274,785,000
Cash and cash equivalents at end of period 269,198,000 273,053,000 255,146,000
Supplemental cash flow information:      
Interest paid 44,069,000 44,560,000 47,273,000
Income taxes paid 49,925,000 65,234,000 80,374,000
Non-cash investing and financing activities:      
Net transfer from loans to other real estate owned $ 2,563,000 $ 3,775,000 $ 2,363,000