Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]		Total
Balance (in shares) at Dec. 31, 2016	22,617
Balance at Dec. 31, 2016	$ 36,250	$ 26,682	$ 252,439	$ (1,499)		$ 313,872
Net income	0	0	38,043	0		38,043
Net change in accumulated other comprehensive income	0	0	0	(431)		(431)
Stock compensation expense	$ 0	2,892	0	0		2,892
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations (in shares)	69
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations	$ 231	2,500	(5,336)	0		(2,605)
Cash dividends declared	$ 0	0	(18,127)	0		(18,127)
Shares repurchased or cancelled (in shares)	(7)
Shares repurchased or cancelled	$ (24)	(150)	174	0		0
Balance (in shares) at Dec. 31, 2017	22,679
Balance at Dec. 31, 2017	$ 36,457	31,924	267,193	(1,930)	[1]	333,644
Net income	0	0	55,517	0		55,517
Net change in accumulated other comprehensive income	0	0	0	(2,706)		(2,706)
Stock compensation expense	$ 0	4,027	0	0		4,027
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations (in shares)	75
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations	$ 249	987	(3,394)	0		(2,158)
Cash dividends declared	$ 0	0	(21,824)	0		(21,824)
Shares repurchased or cancelled (in shares)	(5)
Shares repurchased or cancelled	$ (17)	(141)	158	0		0
Reclassification adjustment - ASU 2018-02	$ 0	0	506	(506)		0
Balance (in shares) at Dec. 31, 2018	22,749
Balance at Dec. 31, 2018	$ 36,689	36,797	298,156	(5,142)		366,500
Net income	0	0	66,067	0		66,067
Net change in accumulated other comprehensive income	0	0	0	5,819		5,819
Stock compensation expense	$ 0	3,578	0	0		3,578
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations (in shares)	116
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations	$ 385	3,701	(7,010)	0		(2,924)
Cash dividends declared	$ 0	0	(23,579)	0		(23,579)
Shares repurchased or cancelled (in shares)	(2)
Shares repurchased or cancelled	$ (6)	(59)	65	0		0
Repurchase of common stock (in shares)	(259)
Repurchase of common stock	$ (861)	(8,303)	0	0		(9,164)
Balance (in shares) at Dec. 31, 2019	22,604
Balance at Dec. 31, 2019	$ 36,207	$ 35,714	$ 333,699	$ 677		$ 406,297

[1] December 31, 2017 AOCI component balances reflect a correction of incorrectly reported year-end balances in the Footnote titled "Other Comprehensive Income (Loss)" of the 2017 Form 10-K, which were presented as $(2,278), $234, and $(392) for securities AFS, cash flow hedges, and minimum pension liability, respectively.