Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Treasury Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Preferred stock, beginning balance (in shares) at Dec. 31, 2021		75,000
Common stock, beginning balance (in shares) at Dec. 31, 2021			37,820,000
Beginning balance at Dec. 31, 2021	$ 1,529,116	$ 71,988	$ 398	$ (73,528)	$ 1,018,799	$ 492,682	$ 18,777
Net income	143,042					143,042
Other comprehensive income (loss)	(171,968)						(171,968)
Common stock dividends	(24,662)					(24,662)
Preferred stock dividends	(3,104)					(3,104)
Repurchase of common shares (in shares)			(700,000)
Repurchase of common stock	(32,923)		$ (7)		(18,867)	(14,049)
Issuance under equity compensation plans, net (in shares)			103,000
Issuance under equity compensation plans, net	789		$ 1		1,421	(633)
Share-based compensation	5,928				5,928
Retirement of treasury stock	0		$ (20)	73,528	(27,738)	(45,770)
Preferred stock, ending balance (in shares) at Sep. 30, 2022		75,000
Common stock, ending balance (in shares) at Sep. 30, 2022			37,223,000
Ending balance at Sep. 30, 2022	1,446,218	$ 71,988	$ 372	0	979,543	547,506	(153,191)
Preferred stock, beginning balance (in shares) at Jun. 30, 2022		75,000
Common stock, beginning balance (in shares) at Jun. 30, 2022			37,206,000
Beginning balance at Jun. 30, 2022	1,447,412	$ 71,988	$ 372	0	976,684	506,849	(108,481)
Net income	50,200					50,200
Other comprehensive income (loss)	(44,710)						(44,710)
Common stock dividends	(8,562)					(8,562)
Preferred stock dividends	(937)					(937)
Issuance under equity compensation plans, net (in shares)			17,000
Issuance under equity compensation plans, net	693				737	(44)
Share-based compensation	2,122				2,122
Preferred stock, ending balance (in shares) at Sep. 30, 2022		75,000
Common stock, ending balance (in shares) at Sep. 30, 2022			37,223,000
Ending balance at Sep. 30, 2022	$ 1,446,218	$ 71,988	$ 372	$ 0	979,543	547,506	(153,191)
Preferred stock, beginning balance (in shares) at Dec. 31, 2022	75,000	75,000
Common stock, beginning balance (in shares) at Dec. 31, 2022	37,253,292		37,253,000
Beginning balance at Dec. 31, 2022	$ 1,522,263	$ 71,988	$ 373		982,660	597,574	(130,332)
Net income	149,530					149,530
Other comprehensive income (loss)	(37,497)						(37,497)
Common stock dividends	(28,014)					(28,014)
Preferred stock dividends	(2,813)					(2,813)
Issuance under equity compensation plans, net (in shares)			132,000
Issuance under equity compensation plans, net	602		$ 1		1,575	(974)
Share-based compensation	$ 7,809				7,809
Preferred stock, ending balance (in shares) at Sep. 30, 2023	75,000	75,000
Common stock, ending balance (in shares) at Sep. 30, 2023	37,385,177		37,385,000
Ending balance at Sep. 30, 2023	$ 1,611,880	$ 71,988	$ 374		992,044	715,303	(167,829)
Preferred stock, beginning balance (in shares) at Jun. 30, 2023		75,000
Common stock, beginning balance (in shares) at Jun. 30, 2023			37,359,000
Beginning balance at Jun. 30, 2023	1,618,233	$ 71,988	$ 374		988,355	680,981	(123,465)
Net income	44,665					44,665
Other comprehensive income (loss)	(44,364)						(44,364)
Common stock dividends	(9,346)					(9,346)
Preferred stock dividends	(938)					(938)
Issuance under equity compensation plans, net (in shares)			26,000
Issuance under equity compensation plans, net	955				1,014	(59)
Share-based compensation	$ 2,675				2,675
Preferred stock, ending balance (in shares) at Sep. 30, 2023	75,000	75,000
Common stock, ending balance (in shares) at Sep. 30, 2023	37,385,177		37,385,000
Ending balance at Sep. 30, 2023	$ 1,611,880	$ 71,988	$ 374		$ 992,044	$ 715,303	$ (167,829)