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, 2021		55,434,910
Beginning balance, net of tax at Dec. 31, 2021	$ 1,319,112	$ 58	$ 1,316,984	$ 92,463	$ (23,758)	$ (66,635)
Increase (decrease) in shareholders' equity
Net income	28,439			28,439
OCI, net of tax	(113,847)				(113,847)
Repurchase of stock (in shares)		(188,614)
Repurchase of stock	(5,220)					(5,220)
Issuance of treasury stock for ESPP (in shares)		25,140
Issuance of treasury stock for ESPP	541		(106)			647
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)		7,349
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(170)		(359)			189
Cash dividends on common stock	(12,739)			(12,739)
Stock dividend equivalents on RSUs	0		273	(273)
Stock-based compensation	1,909		1,909
Ending balance (in shares) at Mar. 31, 2022		55,278,785
Ending balance, net of tax at Mar. 31, 2022	1,218,025	$ 58	1,318,701	107,890	(137,605)	(71,019)
Beginning balance (in shares) at Dec. 31, 2022		55,279,124
Beginning balance, net of tax at Dec. 31, 2022	1,145,977	$ 58	1,320,980	168,769	(273,278)	(70,552)
Increase (decrease) in shareholders' equity
Net income	36,786			36,786
OCI, net of tax	27,494				27,494
Repurchase of stock (in shares)		(25,000)
Repurchase of stock	(534)					(534)
Issuance of treasury stock for ESPP (in shares)		30,360
Issuance of treasury stock for ESPP	525		(257)			782
Net issuance of treasury stock for RSU/DSU vesting and related tax (in shares)		8,977
Net issuance of treasury stock for RSU/PSU/DSU vesting and related tax	(100)		(331)			231
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	(13,268)			(13,268)
Stock dividend equivalents on RSUs	0		363	(363)
Stock-based compensation	1,669		1,669
Ending balance (in shares) at Mar. 31, 2023		55,294,455
Ending balance, net of tax at Mar. 31, 2023	$ 1,198,558	$ 58	$ 1,322,407	$ 191,924	$ (245,784)	$ (70,047)