CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2022		55,279,124
Beginning balance at Dec. 31, 2022	$ 1,145,977	$ 58	$ 1,320,980	$ 168,769	$ (273,278)	$ (70,552)
Increase (decrease) in shareholders' equity
Net income	96,816			96,816
OCI, net of tax	(17,452)				(17,452)
Repurchase of stock (in shares)		(110,123)
Repurchase of stock	(2,209)					(2,209)
Issuance of treasury stock for ESPP (in shares)		51,885
Issuance of treasury stock for ESPP	884		(451)			1,335
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)		120,137
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(989)		(4,083)			3,094
Net issuance of treasury stock for warrants exercised (in shares)		994
Net issuance of treasury stock for warrants exercised	9		(17)			26
Cash dividends on common stock	(39,806)			(39,806)
Stock dividend equivalents on RSUs/PSUs/DSUs	0		1,081	(1,081)
Stock-based compensation	6,928		6,928
Ending balance (in shares) at Sep. 30, 2023		55,342,017
Ending balance at Sep. 30, 2023	1,190,158	$ 58	1,324,438	224,698	(290,730)	(68,306)
Beginning balance (in shares) at Jun. 30, 2023		55,290,847
Beginning balance at Jun. 30, 2023	1,201,948	$ 58	1,325,173	207,660	(260,921)	(70,022)
Increase (decrease) in shareholders' equity
Net income	30,666			30,666
OCI, net of tax	(29,809)				(29,809)
Repurchase of stock (in shares)		(65,123)
Repurchase of stock	(1,278)					(1,278)
Issuance of treasury stock for ESPP (in shares)		11,291
Issuance of treasury stock for ESPP	184		(106)			290
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)		105,002
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(889)		(3,593)			2,704
Cash dividends on common stock	(13,267)			(13,267)
Stock dividend equivalents on RSUs/PSUs/DSUs	0		361	(361)
Stock-based compensation	2,603		2,603
Ending balance (in shares) at Sep. 30, 2023		55,342,017
Ending balance at Sep. 30, 2023	1,190,158	$ 58	1,324,438	224,698	(290,730)	(68,306)
Beginning balance (in shares) at Dec. 31, 2023		55,244,119
Beginning balance at Dec. 31, 2023	1,271,981	$ 58	1,323,595	237,197	(218,803)	(70,066)
Beginning balance (Accounting Standards Update 2023-02) at Dec. 31, 2023	(1,391)			(1,391)
Increase (decrease) in shareholders' equity
Net income	85,586			85,586
OCI, net of tax	47,890				47,890
Stock issued in acquisition, net of stock issuance costs (in shares)		1,429,304
Stock issued in acquisition, net of stock issuance costs	34,234	$ 2	34,232
Issuance of treasury stock for ESPP (in shares)		45,679
Issuance of treasury stock for ESPP	926		(250)			1,176
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)		153,087
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(1,650)		(5,592)			3,942
Net issuance of treasury stock for options exercised, net of shares redeemed and related tax (in shares)		52
Net issuance of treasury stock for options exercised, net of shares redeemed and related tax	0		(1)			1
Cash dividends on common stock	(40,520)			(40,520)
Stock dividend equivalents on RSUs/PSUs/DSUs	0		1,004	(1,004)
Stock-based compensation	5,828		5,828
Ending balance (in shares) at Sep. 30, 2024		56,872,241
Ending balance at Sep. 30, 2024	1,402,884	$ 60	1,358,816	279,868	(170,913)	(64,947)
Beginning balance (in shares) at Jun. 30, 2024		56,746,937
Beginning balance at Jun. 30, 2024	1,333,810	$ 60	1,360,430	261,820	(220,326)	(68,174)
Increase (decrease) in shareholders' equity
Net income	32,004			32,004
OCI, net of tax	49,413				49,413
Issuance of treasury stock for ESPP (in shares)		13,109
Issuance of treasury stock for ESPP	265		(73)			338
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax (in shares)		112,143
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(1,254)		(4,142)			2,888
Net issuance of treasury stock for options exercised, net of shares redeemed and related tax (in shares)		52
Net issuance of treasury stock for options exercised, net of shares redeemed and related tax	0		(1)			1
Cash dividends on common stock	(13,645)			(13,645)
Stock dividend equivalents on RSUs/PSUs/DSUs	0		311	(311)
Stock-based compensation	2,291		2,291
Ending balance (in shares) at Sep. 30, 2024		56,872,241
Ending balance at Sep. 30, 2024	$ 1,402,884	$ 60	$ 1,358,816	$ 279,868	$ (170,913)	$ (64,947)