Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Total
Balance at Dec. 31, 2021	$ 341	$ (6,684)	$ 497,889	$ (75,293)	$ 263,375	$ 679,628
Balance (in shares) at Dec. 31, 2021	30,526,353
Net income			18,219			18,219
Award of common shares released from Employee Benefit Trust					287	287
Vesting of restricted stock unit awards			(285)	6,304	(6,019)
Vesting of restricted stock unit awards (in shares)	297,626
Purchase of treasury shares				(8,469)		(8,469)
Purchase of treasury shares (in shares)	(360,000)
Stock-based compensation expense					4,194	4,194
Repurchase of shares to satisfy tax obligation				(2,376)		(2,376)
Repurchase of shares to satisfy tax obligation (in shares)	(97,435)
Dividends on common stock			(6,850)			(6,850)
Other comprehensive income (loss)		(8,820)				(8,820)
Balance (in shares) at Mar. 31, 2022	30,366,544
Balance at Mar. 31, 2022	$ 341	(15,504)	508,973	(79,834)	261,837	675,813
Balance at Dec. 31, 2021	$ 341	(6,684)	497,889	(75,293)	263,375	679,628
Balance (in shares) at Dec. 31, 2021	30,526,353
Net income						66,696
Other comprehensive income (loss)		(39,610)				(39,610)
Balance (in shares) at Sep. 30, 2022	29,851,253
Balance at Sep. 30, 2022	$ 341	(46,294)	543,894	(90,977)	263,755	670,719
Balance at Mar. 31, 2022	$ 341	(15,504)	508,973	(79,834)	261,837	675,813
Balance (in shares) at Mar. 31, 2022	30,366,544
Net income			25,035			25,035
Vesting of restricted stock unit awards			(5)	43	(38)
Vesting of restricted stock unit awards (in shares)	2,015
Purchase of treasury shares				(8,534)		(8,534)
Purchase of treasury shares (in shares)	(387,689)
Stock-based compensation expense					1,061	1,061
Repurchase of shares to satisfy tax obligation				(17)		(17)
Repurchase of shares to satisfy tax obligation (in shares)	(766)
Dividends on common stock			(6,786)			(6,786)
Other comprehensive income (loss)		(15,760)				(15,760)
Balance (in shares) at Jun. 30, 2022	29,980,104
Balance at Jun. 30, 2022	$ 341	(31,264)	527,217	(88,342)	262,860	670,812
Net income			23,442			23,442
Vesting of restricted stock unit awards			(6)	86	(80)
Vesting of restricted stock unit awards (in shares)	3,995
Purchase of treasury shares				(2,685)		(2,685)
Purchase of treasury shares (in shares)	(131,174)
Stock-based compensation expense					975	975
Repurchase of shares to satisfy tax obligation				(36)		(36)
Repurchase of shares to satisfy tax obligation (in shares)	(1,672)
Dividends on common stock			(6,759)			(6,759)
Other comprehensive income (loss)		(15,030)				(15,030)
Balance (in shares) at Sep. 30, 2022	29,851,253
Balance at Sep. 30, 2022	$ 341	(46,294)	543,894	(90,977)	263,755	670,719
Balance at Dec. 31, 2022	$ 341	(36,488)	547,507	(98,535)	264,332	$ 677,157
Balance (in shares) at Dec. 31, 2022	29,476,391					29,476,391
Net income			4,044			$ 4,044
Vesting of restricted stock unit awards			(220)	5,484	(5,264)
Vesting of restricted stock unit awards (in shares)	256,798
Purchase of treasury shares				(3,053)		(3,053)
Purchase of treasury shares (in shares)	(159,516)
Stock-based compensation expense					3,808	3,808
Repurchase of shares to satisfy tax obligation				(1,656)		(1,656)
Repurchase of shares to satisfy tax obligation (in shares)	(85,217)
Dividends on common stock			(6,659)			(6,659)
Other comprehensive income (loss)		(1,296)				(1,296)
Balance (in shares) at Mar. 31, 2023	29,488,456
Balance at Mar. 31, 2023	$ 341	(37,784)	544,672	(97,760)	262,876	672,345
Balance at Dec. 31, 2022	$ 341	(36,488)	547,507	(98,535)	264,332	$ 677,157
Balance (in shares) at Dec. 31, 2022	29,476,391					29,476,391
Net income						$ 20,565
Other comprehensive income (loss)		(4,443)				$ (4,443)
Balance (in shares) at Sep. 30, 2023	28,904,625					28,904,625
Balance at Sep. 30, 2023	$ 341	(40,931)	548,058	(105,433)	264,486	$ 666,521
Balance at Mar. 31, 2023	$ 341	(37,784)	544,672	(97,760)	262,876	672,345
Balance (in shares) at Mar. 31, 2023	29,488,456
Net income			8,686			8,686
Vesting of restricted stock unit awards			(5)	35	(30)
Vesting of restricted stock unit awards (in shares)	1,690
Purchase of treasury shares				(6,841)		(6,841)
Purchase of treasury shares (in shares)	(528,815)
Stock-based compensation expense					898	898
Repurchase of shares to satisfy tax obligation				(8)		(8)
Repurchase of shares to satisfy tax obligation (in shares)	(612)
Dividends on common stock			(6,598)			(6,598)
Other comprehensive income (loss)		1,765				1,765
Balance (in shares) at Jun. 30, 2023	28,960,719
Balance at Jun. 30, 2023	$ 341	(36,019)	546,755	(104,574)	263,744	670,247
Net income			7,835			7,835
Vesting of restricted stock unit awards			(3)	111	(108)
Vesting of restricted stock unit awards (in shares)	5,430
Purchase of treasury shares				(942)		(942)
Purchase of treasury shares (in shares)	(59,352)
Stock-based compensation expense					850	850
Repurchase of shares to satisfy tax obligation				(28)		(28)
Repurchase of shares to satisfy tax obligation (in shares)	(2,172)
Dividends on common stock			(6,529)			(6,529)
Other comprehensive income (loss)		(4,912)				$ (4,912)
Balance (in shares) at Sep. 30, 2023	28,904,625					28,904,625
Balance at Sep. 30, 2023	$ 341	$ (40,931)	$ 548,058	$ (105,433)	$ 264,486	$ 666,521