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, 2021	$ 17,760	$ 133,215	$ 242,750	$ 13,702	$ 407,427	$ 0	$ 0	$ (717)	$ 0	$ (717)
Balance (in shares) at Dec. 31, 2021	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
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
Balance at Dec. 31, 2022	$ 17,027	112,834	292,261	(65,108)	$ 357,014
Balance (ASU 2016-13 [Member]) at Dec. 31, 2022						$ 0	$ 0	$ (997)	$ 0	$ (997)
Balance (in shares) at Dec. 31, 2022	17,027,197				17,027,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	52,421	0	$ 52,421
Cash dividends declared	0	0	(6,609)	0	(6,609)
Other comprehensive loss	0	0	0	(19,485)	(19,485)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 40	(433)	0	0	(393)
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)	40,720
Repurchases of common stock	$ (467)	(11,393)	0	0	(11,860)
Repurchases of common stock (in shares)	(467,475)
Stock-based compensation	$ 0	1,625	0	0	1,625
Balance at Sep. 30, 2023	$ 16,600	102,633	337,076	(84,593)	$ 371,716
Balance (in shares) at Sep. 30, 2023	16,600,442				16,600,442
Balance at Jun. 30, 2023	$ 16,952	111,133	325,772	(61,828)	$ 392,029
Balance (in shares) at Jun. 30, 2023	16,952,072
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	13,494	0	13,494
Cash dividends declared	0	0	(2,190)	0	(2,190)
Other comprehensive loss	0	0	0	(22,765)	(22,765)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 2	(53)	0	0	(51)
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)	2,891
Repurchases of common stock	$ (354)	(8,958)	0	0	(9,312)
Repurchases of common stock (in shares)	(354,521)
Stock-based compensation	$ 0	511	0	0	511
Balance at Sep. 30, 2023	$ 16,600	$ 102,633	$ 337,076	$ (84,593)	$ 371,716
Balance (in shares) at Sep. 30, 2023	16,600,442				16,600,442