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Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities [Abstract]      
Net income $ 51,493 $ 47,346 $ 46,432
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]      
Depreciation 4,007 3,904 3,932
Stock-based compensation 636 458 783
Excess tax benefits of stock-based compensation 0 100 104
Gain on debt repurchase (560) 0 0
Changes in [Abstract]      
Other assets (4,412) (3,205) (6,274)
Other liabilities 1,631 2,874 (2,488)
Net cash provided by operating activities 62,351 61,425 54,979
Cash flows from investing activities [Abstract]      
Purchase of premises and equipment (2,400) (3,498) (2,246)
Net cash used in investing activities (186,586) (86,107) (108,349)
Cash flows from financing activities [Abstract]      
Issuance of common stock 1,513 2,985 2,082
Repurchase of common stock 0 (382) (189)
Excess tax benefits of stock-based compensation 0 (100) (104)
Dividends paid (22,981) (22,190) (21,330)
Net cash provided by (used in) financing activities 154,793 (18,213) 135,464
Net increase (decrease) in cash and cash equivalents 30,558 (42,895) 82,094
Cash and cash equivalents at beginning of year 144,716 187,611 105,517
Cash and cash equivalents at end of year 175,274 144,716 187,611
Parent Company [Member]      
Cash flows from operating activities [Abstract]      
Net income 51,493 47,346 46,432
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]      
Depreciation 116 107 130
Equity in undistributed earnings of subsidiaries (29,180) (28,586) (28,604)
Stock-based compensation 636 458 783
Excess tax benefits of stock-based compensation 0 100 104
Gain on debt repurchase (560) 0 0
Changes in [Abstract]      
Other assets 145 519 240
Other liabilities 412 (90) 968
Net cash provided by operating activities 23,062 19,854 20,053
Cash flows from investing activities [Abstract]      
Payment for investment in subsidiary (1,440) 0 0
Purchase of premises and equipment (179) (104) (45)
Net cash used in investing activities (1,619) (104) (45)
Cash flows from financing activities [Abstract]      
Issuance of common stock 1,513 2,985 2,082
Repurchase of common stock 0 (382) (189)
Excess tax benefits of stock-based compensation 0 (100) (104)
Dividends paid (22,981) (22,190) (21,330)
Net cash provided by (used in) financing activities (21,468) (19,687) (19,541)
Net increase (decrease) in cash and cash equivalents (25) 63 467
Cash and cash equivalents at beginning of year 1,525 1,462 995
Cash and cash equivalents at end of year $ 1,500 $ 1,525 $ 1,462