CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance, beginning at Dec. 31, 2019	$ 574	$ 4,482	$ 111,944	$ 1,600	$ (1,912)	$ 116,688
Net income			2,165			2,165
Other comprehensive loss net of tax				(497)		(497)
Treasury stock purchased					(1,098)	(1,098)
Treasury stock issued		(6)			156	150
Cash dividends paid			(902)			(902)
Balance, ending at Mar. 31, 2020	574	4,476	113,207	1,103	(2,854)	116,506
Balance, beginning at Dec. 31, 2019	574	4,482	111,944	1,600	(1,912)	116,688
Net income						8,699
Balance, ending at Sep. 30, 2020	574	4,456	117,960	5,756	(3,438)	125,308
Balance, beginning at Mar. 31, 2020	574	4,476	113,207	1,103	(2,854)	116,506
Net income			3,599			3,599
Other comprehensive loss net of tax				3,419		3,419
Treasury stock purchased					(627)	(627)
Treasury stock issued		(10)			167	157
Cash dividends paid			(892)			(892)
Balance, ending at Jun. 30, 2020	574	4,466	115,914	4,522	(3,314)	122,162
Net income			2,935			2,935
Other comprehensive loss net of tax				1,234		1,234
Treasury stock purchased					(304)	(304)
Treasury stock issued		(10)			180	170
Cash dividends paid			(889)			(889)
Balance, ending at Sep. 30, 2020	574	4,456	117,960	5,756	(3,438)	125,308
Balance, beginning at Dec. 31, 2020	574	4,444	120,670	7,958	(3,430)	130,216
Net income			4,504			4,504
Other comprehensive loss net of tax				(5,034)		(5,034)
Treasury stock purchased					(149)	(149)
Treasury stock issued		16			157	173
Cash dividends paid			(889)			(889)
Balance, ending at Mar. 31, 2021	574	4,460	124,285	2,924	(3,422)	128,821
Balance, beginning at Dec. 31, 2020	574	4,444	120,670	7,958	(3,430)	130,216
Net income						12,194
Balance, ending at Sep. 30, 2021	574	4,498	130,082	4,326	(3,263)	136,217
Balance, beginning at Mar. 31, 2021	574	4,460	124,285	2,924	(3,422)	128,821
Net income			3,551			3,551
Other comprehensive loss net of tax				4,438		4,438
Treasury stock purchased					(155)	(155)
Treasury stock issued		20			211	231
Cash dividends paid			(945)			(945)
Balance, ending at Jun. 30, 2021	574	4,480	126,891	7,362	(3,366)	135,941
Net income			4,139			4,139
Other comprehensive loss net of tax				(3,036)		(3,036)
Treasury stock purchased					(68)	(68)
Treasury stock issued		18			171	189
Cash dividends paid			(948)			(948)
Balance, ending at Sep. 30, 2021	$ 574	$ 4,498	$ 130,082	$ 4,326	$ (3,263)	$ 136,217