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Parent Company Financial Statements, Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities [Abstract]
Net income	$ 64,540	$ 59,228	$ 51,493
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	5,515	3,786	4,007
Deferred taxes	(1,412)	(246)	(3,090)
Stock-based compensation	859	710	636
Gain on debt repurchase	(219)	0	(560)
Changes in [Abstract]
Other assets	4,941	(14,694)	(2,996)
Other liabilities	(2,440)	9,660	2,659
Net cash provided by operating activities	83,458	65,487	62,351
Cash flows from investing activities [Abstract]
Purchase of premises and equipment	(2,570)	(2,832)	(2,400)
Net cash used in investing activities	(34,491)	(100,590)	(186,586)
Cash flows from financing activities [Abstract]
Issuance of common stock	1,264	1,230	1,513
Dividends paid	(26,235)	(24,395)	(22,981)
Net cash provided by financing activities	74,266	1,279	154,793
Cash and cash equivalents at beginning of year	141,450
Cash and cash equivalents at end of year	264,683	141,450
Parent Company [Member]
Cash flows from operating activities [Abstract]
Net income	64,540	59,228	51,493
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]
Depreciation	144	135	116
Equity in undistributed earnings of subsidiaries	(34,621)	(36,379)	(29,180)
Deferred taxes	(4,907)	(12)	192
Stock-based compensation	859	710	636
Gain on debt repurchase	(219)	0	(560)
Changes in [Abstract]
Other assets	1	(50)	(47)
Other liabilities	683	53	412
Net cash provided by operating activities	26,480	23,685	23,062
Cash flows from investing activities [Abstract]
Payment for investment in subsidiary	(1,281)	0	(1,440)
Purchase of premises and equipment	(78)	(81)	(179)
Net cash used in investing activities	(1,359)	(81)	(1,619)
Cash flows from financing activities [Abstract]
Issuance of common stock	1,264	1,230	1,513
Dividends paid	(26,235)	(24,395)	(22,981)
Net cash provided by financing activities	(24,971)	(23,165)	(21,468)
Net increase (decrease) in cash and cash equivalents	150	439	(25)
Cash and cash equivalents at beginning of year	1,939	1,500	1,525
Cash and cash equivalents at end of year	$ 2,089	$ 1,939	$ 1,500

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