Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at beginning of period at Dec. 31, 2020	$ 130,589	$ 6,769	$ 59,307	$ 68,935	$ 1,528	$ (5,950)
Increase (Decrease) in Stockholders' Equity
Net income	16,527			16,527
Other comprehensive loss	(3,100)				(3,100)
Purchase of treasury stock	(2,148)					(2,148)
Stock dividend	0	255	5,130	(5,385)
Cash dividends declared, common stock	(2,774)			(2,774)
Balance at end of period at Sep. 30, 2021	139,094	7,024	64,437	77,303	(1,572)	(8,098)
Balance at beginning of period at Jun. 30, 2021	136,503	6,769	64,692	72,499	641	(8,098)
Increase (Decrease) in Stockholders' Equity
Net income	5,796			5,796
Other comprehensive loss	(2,213)				(2,213)
Stock dividend	0	255	(255)	0
Cash dividends declared, common stock	(992)			(992)
Balance at end of period at Sep. 30, 2021	139,094	7,024	64,437	77,303	(1,572)	(8,098)
Balance at beginning of period at Dec. 31, 2021	148,956	7,024	64,437	82,300	3,293	(8,098)
Increase (Decrease) in Stockholders' Equity
Net income	16,025			16,025
Other comprehensive loss	(43,438)				(43,438)
Purchase of treasury stock	(2,892)					(2,892)
Stock dividend	0	260	6,605	(6,865)
Cash dividends declared, common stock	(3,246)			(3,246)
Balance at end of period at Sep. 30, 2022	115,405	7,284	71,042	88,214	(40,145)	(10,990)
Balance at beginning of period at Jun. 30, 2022	124,058	7,024	71,302	84,437	(27,715)	(10,990)
Increase (Decrease) in Stockholders' Equity
Net income	4,927			4,927
Other comprehensive loss	(12,430)				(12,430)
Purchase of treasury stock	0					0
Stock dividend	0	260	(260)	0
Cash dividends declared, common stock	(1,150)			(1,150)
Balance at end of period at Sep. 30, 2022	$ 115,405	$ 7,284	$ 71,042	$ 88,214	$ (40,145)	$ (10,990)