Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2019	0					22,604
Balance at Dec. 31, 2019	$ 0	$ 0	$ (8,823)	$ 0	$ (8,823)	$ 36,207	$ 35,714	$ 333,699	$ 677	$ 406,297
Net income						0	0	13,232	0	13,232
Other comprehensive income (loss)						0	0	0	5,775	5,775
Stock compensation expense						$ 0	817	0	0	817
Stock issued for share-based awards, net of witholdings to satisfy employee tax obligations (in shares)						62
Stock issued for share-based awards, net of witholdings to satisfy employee tax obligations						$ 203	1,858	(3,546)	0	(1,485)
Cash dividends declared						$ 0	0	(6,111)	0	(6,111)
Shares cancelled (in shares)						(1)
Shares cancelled						$ (2)	(22)	24	0	0
Balance (in shares) at Mar. 31, 2020						22,665
Balance at Mar. 31, 2020						$ 36,408	38,367	328,475	6,452	409,702
Balance (in shares) at Dec. 31, 2020						22,692
Balance at Dec. 31, 2020						$ 36,500	41,886	353,574	8,741	440,701
Net income						0	0	22,710	0	22,710
Other comprehensive income (loss)						0	0	0	(11,791)	(11,791)
Stock compensation expense						$ 0	849	0	0	849
Stock issued for share-based awards, net of witholdings to satisfy employee tax obligations (in shares)						89
Stock issued for share-based awards, net of witholdings to satisfy employee tax obligations						$ 296	4,144	(7,533)	0	(3,093)
Cash dividends declared						$ 0	0	(6,144)	0	(6,144)
Balance (in shares) at Mar. 31, 2021						22,781
Balance at Mar. 31, 2021						$ 36,796	$ 46,879	$ 362,607	$ (3,050)	$ 443,232