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Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities [Abstract] |  |  |
Net income | $ 59,228 | $ 51,493 | $ 47,346
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation | 3,786 | 4,007 | 3,904
Stock-based compensation | 710 | 636 | 458
Excess tax benefits of stock-based compensation | 0 | 0 | 100
Gain on debt repurchase | 0 | (560) | 0
Changes in [Abstract] |  |  |
Other assets | (15,788) | (4,412) | (3,205)
Other liabilities | 8,986 | 1,631 | 2,874
Net cash provided by operating activities | 65,487 | 62,351 | 61,425
Cash flows from investing activities [Abstract] |  |  |
Purchase of premises and equipment | (2,832) | (2,400) | (3,498)
Net cash used in investing activities | (100,590) | (186,586) | (86,107)
Cash flows from financing activities [Abstract] |  |  |
Issuance of common stock | 1,230 | 1,513 | 2,985
Repurchase of common stock | 0 | 0 | (382)
Excess tax benefits of stock-based compensation | 0 | 0 | (100)
Dividends paid | (24,395) | (22,981) | (22,190)
Net cash provided by (used in) financing activities | 1,279 | 154,793 | (18,213)
Net increase (decrease) in cash and cash equivalents | (33,824) | 30,558 | (42,895)
Cash and cash equivalents at beginning of year | 175,274 | 144,716 | 187,611
Cash and cash equivalents at end of year | 141,450 | 175,274 | 144,716
Parent Company [Member] |  |  |
Cash flows from operating activities [Abstract] |  |  |
Net income | 59,228 | 51,493 | 47,346
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |  |
Depreciation | 135 | 116 | 107
Equity in undistributed earnings of subsidiaries | (36,379) | (29,180) | (28,586)
Stock-based compensation | 710 | 636 | 458
Excess tax benefits of stock-based compensation | 0 | 0 | 100
Gain on debt repurchase | 0 | (560) | 0
Changes in [Abstract] |  |  |
Other assets | (62) | 145 | 519
Other liabilities | 53 | 412 | (90)
Net cash provided by operating activities | 23,685 | 23,062 | 19,854
Cash flows from investing activities [Abstract] |  |  |
Payment for investment in subsidiary | 0 | (1,440) | 0
Purchase of premises and equipment | (81) | (179) | (104)
Net cash used in investing activities | (81) | (1,619) | (104)
Cash flows from financing activities [Abstract] |  |  |
Issuance of common stock | 1,230 | 1,513 | 2,985
Repurchase of common stock | 0 | 0 | (382)
Excess tax benefits of stock-based compensation | 0 | 0 | (100)
Dividends paid | (24,395) | (22,981) | (22,190)
Net cash provided by (used in) financing activities | (23,165) | (21,468) | (19,687)
Net increase (decrease) in cash and cash equivalents | 439 | (25) | 63
Cash and cash equivalents at beginning of year | 1,500 | 1,525 | 1,462
Cash and cash equivalents at end of year | $ 1,939 | $ 1,500 | $ 1,525

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