Consolidated Statements of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss), net of Tax	Cumulative effect of adoption of accounting principles	Cumulative effect of adoption of accounting principles  Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		6,251,000
Beginning balance, value at Dec. 31, 2020	$ 221,575	$ 6,251	$ 41,808	$ 173,498	$ 18	$ 2,400	$ 2,400
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend on common stock	(2,313)			(2,313)
Stock-based compensation expense	280		280
Exercise of stock options and vesting of restricted stock units, net (in shares)		17,000
Exercise of stock options and vesting of restricted stock units, net	(278)	$ 17	(295)
Repurchase of common stock (in shares)		(61,000)
Repurchase of common stock	(2,212)	$ (61)	(2,151)
Other comprehensive income (loss), net of tax	(181)				(181)
Net income	12,181			12,181
Ending balance (in shares) at Mar. 31, 2021		6,207,000
Ending balance, value at Mar. 31, 2021	231,452	$ 6,207	39,642	185,766	(163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend on common stock	(2,320)			(2,320)
Stock-based compensation expense	229		229
Other comprehensive income (loss), net of tax	(488)				(488)
Net income	8,345			8,345
Ending balance (in shares) at Jun. 30, 2021		6,207,000
Ending balance, value at Jun. 30, 2021	237,218	$ 6,207	39,871	191,791	(651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend on common stock	(2,384)			(2,384)
Stock-based compensation expense	232		232
Repurchase of common stock (in shares)		(30,000)
Repurchase of common stock	(1,204)	$ (30)	(1,174)
Other comprehensive income (loss), net of tax	(265)				(265)
Net income	8,877			8,877
Ending balance (in shares) at Sep. 30, 2021		6,177,000
Ending balance, value at Sep. 30, 2021	242,474	$ 6,177	38,929	198,284	(916)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend on common stock	(2,352)			(2,352)
Stock-based compensation expense	332		332
Exercise of stock options and vesting of restricted stock units, net (in shares)		26,000
Exercise of stock options and vesting of restricted stock units, net	(143)	$ 26	(169)
Repurchase of common stock (in shares)		(188,000)
Repurchase of common stock	(8,118)	$ (188)	(7,930)
Other comprehensive income (loss), net of tax	(2,490)				(2,490)
Net income	$ 8,114			8,114
Ending balance (in shares) at Dec. 31, 2021	6,014,813	6,015,000
Ending balance, value at Dec. 31, 2021	$ 237,817	$ 6,015	31,162	204,046	(3,406)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividend on common stock	(2,471)			(2,471)
Stock-based compensation expense	187		187
Repurchase of common stock (in shares)		(133,000)
Repurchase of common stock	(5,923)	$ (133)	(5,790)
Other comprehensive income (loss), net of tax	(11,004)				(11,004)
Net income	$ 7,226			7,226
Ending balance (in shares) at Mar. 31, 2022	5,881,708	5,882,000
Ending balance, value at Mar. 31, 2022	$ 225,832	$ 5,882	$ 25,559	$ 208,801	$ (14,410)