CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Series G	Preferred Stock	Preferred Stock Series G	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Beginning balance ( in shares) at Dec. 31, 2020			14,980		10,737
Beginning balance at Dec. 31, 2020	$ 992,477		$ 363,204		$ 10,737	$ 122,899	$ (13,923)	$ 509,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,227							33,227
Other comprehensive (loss)/income net of tax	65,667						65,667
Cash dividends, preferred stock	(5,269)							(5,269)
Cash dividends, common stock	(9,450)							(9,450)
Issuance of common stock (in shares)					21
Issuance of common stock	33				$ 21	12
Stock-based compensation cost	1,665					1,665
Other stock-based award activity	(858)					(858)
Ending balance (in shares) at Mar. 31, 2021			14,980		10,758
Ending balance at Mar. 31, 2021	1,077,492		$ 363,204		$ 10,758	123,718	51,744	528,068
Beginning balance ( in shares) at Dec. 31, 2020			14,980		10,737
Beginning balance at Dec. 31, 2020	992,477		$ 363,204		$ 10,737	122,899	(13,923)	509,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64,513
Other comprehensive (loss)/income net of tax	30,656
Ending balance (in shares) at Jun. 30, 2021			19,980		10,765
Ending balance at Jun. 30, 2021	1,180,215		$ 484,531		$ 10,765	124,148	16,733	544,038
Beginning balance ( in shares) at Mar. 31, 2021			14,980		10,758
Beginning balance at Mar. 31, 2021	1,077,492		$ 363,204		$ 10,758	123,718	51,744	528,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,286							31,286
Other comprehensive (loss)/income net of tax	(35,011)						(35,011)
Cash dividends, preferred stock	(5,842)							(5,842)
Cash dividends, common stock	(9,474)							(9,474)
Issuance of common stock (in shares)				5,000	7
Issuance of common stock	20	$ 121,327		$ 121,327	$ 7	13
Stock-based compensation cost	891					891
Other stock-based award activity	(474)					(474)
Ending balance (in shares) at Jun. 30, 2021			19,980		10,765
Ending balance at Jun. 30, 2021	1,180,215		$ 484,531		$ 10,765	124,148	16,733	544,038
Beginning balance ( in shares) at Dec. 31, 2021			19,980		10,766
Beginning balance at Dec. 31, 2021	1,204,413		$ 484,531		$ 10,766	125,993	3,853	579,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,837							47,837
Other comprehensive (loss)/income net of tax	(43,518)						(43,518)
Cash dividends, preferred stock	(6,791)							(6,791)
Cash dividends, common stock	(10,229)							(10,229)
Issuance of common stock (in shares)					22
Issuance of common stock	68				$ 22	46
Stock-based compensation cost	2,113					2,113
Other stock-based award activity	(1,049)					(1,049)
Ending balance (in shares) at Mar. 31, 2022			19,980		10,788
Ending balance at Mar. 31, 2022	1,192,844		$ 484,531		$ 10,788	127,103	(39,665)	610,087
Beginning balance ( in shares) at Dec. 31, 2021			19,980		10,766
Beginning balance at Dec. 31, 2021	1,204,413		$ 484,531		$ 10,766	125,993	3,853	579,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	93,733
Other comprehensive (loss)/income net of tax	(53,337)
Ending balance (in shares) at Jun. 30, 2022			19,980		10,797
Ending balance at Jun. 30, 2022	1,212,348		$ 484,531		$ 10,797	127,569	(49,484)	638,935
Beginning balance ( in shares) at Mar. 31, 2022			19,980		10,788
Beginning balance at Mar. 31, 2022	1,192,844		$ 484,531		$ 10,788	127,103	(39,665)	610,087
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,896							45,896
Other comprehensive (loss)/income net of tax	(9,819)						(9,819)
Cash dividends, preferred stock	(6,792)							(6,792)
Cash dividends, common stock	(10,256)							(10,256)
Issuance of common stock (in shares)					9
Issuance of common stock	55				$ 9	46
Stock-based compensation cost	862					862
Other stock-based award activity	(442)					(442)
Ending balance (in shares) at Jun. 30, 2022			19,980		10,797
Ending balance at Jun. 30, 2022	$ 1,212,348		$ 484,531		$ 10,797	$ 127,569	$ (49,484)	$ 638,935