CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2017	$ 110,445	$ 74,983	$ (2,073)	$ 183,355
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	20,168	0	20,168
Other comprehensive income (loss)	0	0	(1,779)	(1,779)
Cash dividends paid	0	(7,805)	0	(7,805)
Cash in lieu of fractional share for 5 for 4 stock split	0	(13)	0	(13)
Stock issued to acquire subsidiary, net	22,358	0	0	22,358
Stock options exercised	193	0	0	193
Stock based compensation expense	252	0	0	252
Balance at Dec. 31, 2018	133,248	87,333	(3,852)	216,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	24,196	0	24,196
Other comprehensive income (loss)	0	0	7,555	7,555
Cash dividends paid	0	(8,786)	0	(8,786)
Stock options exercised	246	0	0	246
Stock based compensation expense	301	0	0	301
Balance at Dec. 31, 2019	133,795	102,743	3,703	240,241
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	22,438	0	22,438
Other comprehensive income (loss)	0	0	5,716	5,716
Cash dividends paid	0	(8,803)	0	(8,803)
Stock options exercised	35	0	0	35
Stock based compensation expense	280	0	0	280
Balance at Dec. 31, 2020	$ 134,110	$ 116,378	$ 9,419	$ 259,907