Condensed 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						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 withholdings to satisfy employee tax obligations (in shares)						62
Stock issued for share-based awards, net of withholdings 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, 2019						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										41,133
Other comprehensive income (loss)									8,195	8,194
Balance (in shares) at Sep. 30, 2020						22,692
Balance at Sep. 30, 2020						$ 36,500	41,256	341,970	8,872	428,598
Balance (in shares) at Mar. 31, 2020						22,665
Balance at Mar. 31, 2020						$ 36,408	38,367	328,475	6,452	409,702
Net income						0	0	13,368	0	13,368
Other comprehensive income (loss)						0	0	0	2,364	2,364
Stock compensation expense						$ 0	976	0	0	976
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations (in shares)						2
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations						$ 8	96	(163)	0	(59)
Cash dividends declared						0	0	(6,120)	0	(6,120)
Shares cancelled						$ (1)	(14)	15	0	0
Balance (in shares) at Jun. 30, 2020						22,667
Balance at Jun. 30, 2020						$ 36,415	39,425	335,575	8,816	420,231
Net income						0	0	14,533	0	14,533
Other comprehensive income (loss)						0	0	0	56	56
Stock compensation expense						$ 0	843	0	0	843
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations (in shares)						27
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations						$ 91	1,049	(2,083)	0	(943)
Cash dividends declared						$ 0	0	(6,122)	0	(6,122)
Shares cancelled (in shares)						(2)
Shares cancelled						$ (6)	(61)	67	0	0
Balance (in shares) at Sep. 30, 2020						22,692
Balance at Sep. 30, 2020						$ 36,500	41,256	341,970	8,872	428,598
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 withholdings to satisfy employee tax obligations (in shares)						89
Stock issued for share-based awards, net of withholdings 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
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										50,056
Other comprehensive income (loss)										(11,372)
Balance (in shares) at Sep. 30, 2021						26,585
Balance at Sep. 30, 2021						$ 49,462	241,254	375,462	(2,631)	663,547
Balance (in shares) at Mar. 31, 2021						22,781
Balance at Mar. 31, 2021						$ 36,796	46,879	362,607	(3,050)	443,232
Net income						0	0	4,184	0	4,184
Other comprehensive income (loss)						0	0	0	4,840	4,840
Stock compensation expense						0	1,414	0	0	1,414
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations						(2)	(26)	(45)	0	(73)
Cash dividends declared						$ 0	0	(7,178)	0	(7,178)
Stock issued for KB acquisition (in shares)						3,808
Stock issued for KB acquisition						$ 12,682	191,988	0	0	204,670
Shares cancelled (in shares)						(1)
Shares cancelled						$ (5)	(55)	60	0	0
Balance (in shares) at Jun. 30, 2021						26,588
Balance at Jun. 30, 2021						$ 49,471	240,200	359,628	1,790	651,089
Net income						0	0	23,162	0	23,162
Other comprehensive income (loss)						0	0	0	(4,421)	(4,421)
Stock compensation expense						0	1,165	0	0	1,165
Stock issued for share-based awards, net of withholdings to satisfy employee tax obligations						(1)	(10)	0	0	(11)
Cash dividends declared						$ 0	0	(7,437)	0	(7,437)
Shares cancelled (in shares)						(3)
Shares cancelled						$ (8)	(101)	109	0	0
Balance (in shares) at Sep. 30, 2021						26,585
Balance at Sep. 30, 2021						$ 49,462	$ 241,254	$ 375,462	$ (2,631)	$ 663,547