CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total	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] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2020	$ 18,076	$ 141,112	$ 189,521	$ 21,339	$ 370,048
Balance (in shares) at Dec. 31, 2020	18,076,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	44,000	0	44,000
Cash dividends declared	0	0	(3,784)	0	(3,784)
Other comprehensive loss	0	0	0	(7,025)	(7,025)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 21	(127)	0	0	(106)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes (in shares)	20,552
Repurchases of common stock	$ (273)	(5,809)	0	0	(6,082)
Repurchases of common stock (in shares)	(272,822)
Stock-based compensation	$ 0	1,225	0	0	1,225
Balance at Sep. 30, 2021	$ 17,824	136,401	229,737	14,314	398,276
Balance (in shares) at Sep. 30, 2021	17,824,094
Balance at Jun. 30, 2021	$ 18,014	140,212	216,164	18,425	392,815
Balance (in shares) at Jun. 30, 2021	18,014,398
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	15,190	0	15,190
Cash dividends declared	0	0	(1,617)	0	(1,617)
Other comprehensive loss	0	0	0	(4,111)	(4,111)
Repurchases of common stock	$ (190)	(4,214)	0	0	(4,404)
Repurchases of common stock (in shares)	(190,304)
Stock-based compensation	$ 0	403	0	0	403
Balance at Sep. 30, 2021	$ 17,824	136,401	229,737	14,314	398,276
Balance (in shares) at Sep. 30, 2021	17,824,094
Balance at Dec. 31, 2021	$ 17,760	133,215	242,750	13,702	$ 407,427
Balance (ASU 2016-02 [Member]) at Dec. 31, 2021						$ 0	$ 0	$ (717)	$ 0	$ (717)
Balance (in shares) at Dec. 31, 2021	17,760,243				17,760,243
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	45,619	0	$ 45,619
Cash dividends declared	0	0	(5,973)	0	(5,973)
Other comprehensive loss	0	0	0	(87,212)	(87,212)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 34	(319)	0	0	(285)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes (in shares)	34,010
Repurchases of common stock	$ (729)	(18,197)	0	0	(18,926)
Repurchases of common stock (in shares)	(729,613)
Stock-based compensation	$ 0	1,866	0	0	1,866
Balance at Sep. 30, 2022	$ 17,065	116,565	281,679	(73,510)	$ 341,799
Balance (in shares) at Sep. 30, 2022	17,064,640				17,064,640
Balance at Jun. 30, 2022	$ 17,417	125,332	268,305	(46,832)	$ 364,222
Balance (in shares) at Jun. 30, 2022	17,417,094
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	15,458	0	15,458
Cash dividends declared	0	0	(2,084)	0	(2,084)
Other comprehensive loss	0	0	0	(26,678)	(26,678)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 14	(104)	0	0	(90)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes (in shares)	13,673
Repurchases of common stock	$ (366)	(9,352)	0	0	(9,718)
Repurchases of common stock (in shares)	(366,127)
Stock-based compensation	$ 0	689	0	0	689
Balance at Sep. 30, 2022	$ 17,065	$ 116,565	$ 281,679	$ (73,510)	$ 341,799
Balance (in shares) at Sep. 30, 2022	17,064,640				17,064,640