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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

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