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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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