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	28,810	0	28,810
Cash dividends declared	0	0	(2,167)	0	(2,167)
Other comprehensive income (loss)	0	0	0	(2,914)	(2,914)
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	$ (83)	(1,595)	0	0	(1,678)
Repurchases of common stock (in shares)	(82,518)
Stock-based compensation	$ 0	822	0	0	822
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
Balance at Mar. 31, 2021	$ 18,053	140,633	203,777	12,208	374,671
Balance (in shares) at Mar. 31, 2021	18,053,229
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	13,650	0	13,650
Cash dividends declared	0	0	(1,263)	0	(1,263)
Other comprehensive income (loss)	0	0	0	6,217	6,217
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 1	(1)	0	0	0
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)	503
Repurchases of common stock	$ (40)	(852)	0	0	(892)
Repurchases of common stock (in shares)	(39,334)
Stock-based compensation	$ 0	432	0	0	432
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
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	30,161	0	$ 30,161
Cash dividends declared	0	0	(3,889)	0	(3,889)
Other comprehensive income (loss)	0	0	0	(60,534)	(60,534)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 20	(215)	0	0	(195)
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)	20,337
Repurchases of common stock	$ (363)	(8,845)	0	0	(9,208)
Repurchases of common stock (in shares)	(363,486)
Stock-based compensation	$ 0	1,177	0	0	1,177
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				17,417,094
Balance at Mar. 31, 2022	$ 17,673	130,618	255,078	(16,301)	$ 387,068
Balance (ASU 2016-02 [Member]) at Mar. 31, 2022						$ 0	$ 0	$ (717)	$ 0	$ (717)
Balance (in shares) at Mar. 31, 2022	17,673,407
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	15,883	0	15,883
Cash dividends declared	0	0	(1,939)	0	(1,939)
Other comprehensive income (loss)	0	0	0	(30,531)	(30,531)
Exercise of employee stock options and vesting of restricted stock units, net of shares for cashless exercise and net of shares for taxes	$ 1	(1)	0	0	0
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)	675
Repurchases of common stock	$ (257)	(5,933)	0	0	(6,190)
Repurchases of common stock (in shares)	(256,988)
Stock-based compensation	$ 0	648	0	0	648
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				17,417,094