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	$ 997,934		$ 363,204		$ 10,737	$ 122,899	$ (13,923)	$ 515,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	38,069							38,069
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	1,087,791		$ 363,204		$ 10,758	123,718	51,744	538,367
Beginning balance ( in shares) at Dec. 31, 2020			14,980		10,737
Beginning balance at Dec. 31, 2020	997,934		$ 363,204		$ 10,737	122,899	(13,923)	515,017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102,236
Other comprehensive (loss)/income net of tax	32,129
Ending balance (in shares) at Sep. 30, 2021			19,980		10,766
Ending balance at Sep. 30, 2021	1,209,416		$ 484,531		$ 10,766	124,942	18,206	570,971
Beginning balance ( in shares) at Mar. 31, 2021			14,980		10,758
Beginning balance at Mar. 31, 2021	1,087,791		$ 363,204		$ 10,758	123,718	51,744	538,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	28,863							28,863
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	1,188,091		$ 484,531		$ 10,765	124,148	16,733	551,914
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,305							35,305
Other comprehensive (loss)/income net of tax	1,473						1,473
Cash dividends, preferred stock	(6,774)							(6,774)
Cash dividends, common stock	(9,474)							(9,474)
Issuance of common stock (in shares)					1
Issuance of common stock	46				$ 1	45
Stock-based compensation cost	749					749
Ending balance (in shares) at Sep. 30, 2021			19,980		10,766
Ending balance at Sep. 30, 2021	1,209,416		$ 484,531		$ 10,766	124,942	18,206	570,971
Beginning balance ( in shares) at Dec. 31, 2021			19,980		10,766
Beginning balance at Dec. 31, 2021	1,213,700		$ 484,531		$ 10,766	125,993	3,853	588,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,453							51,453
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	1,205,747		$ 484,531		$ 10,788	127,103	(39,665)	622,990
Beginning balance ( in shares) at Dec. 31, 2021			19,980		10,766
Beginning balance at Dec. 31, 2021	1,213,700		$ 484,531		$ 10,766	125,993	3,853	588,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	134,726
Other comprehensive (loss)/income net of tax	(67,442)
Ending balance (in shares) at Sep. 30, 2022			19,980		10,800
Ending balance at Sep. 30, 2022	1,232,023		$ 484,531		$ 10,800	128,117	(63,589)	672,164
Beginning balance ( in shares) at Mar. 31, 2022			19,980		10,788
Beginning balance at Mar. 31, 2022	1,205,747		$ 484,531		$ 10,788	127,103	(39,665)	622,990
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,855							41,855
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	1,221,210		$ 484,531		$ 10,797	127,569	(49,484)	647,797
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,418							41,418
Other comprehensive (loss)/income net of tax	(14,105)						(14,105)
Cash dividends, preferred stock	(6,791)							(6,791)
Cash dividends, common stock	(10,260)							(10,260)
Issuance of common stock (in shares)					3
Issuance of common stock	51				$ 3	48
Stock-based compensation cost	832					832
Other stock-based award activity	(332)					(332)
Ending balance (in shares) at Sep. 30, 2022			19,980		10,800
Ending balance at Sep. 30, 2022	$ 1,232,023		$ 484,531		$ 10,800	$ 128,117	$ (63,589)	$ 672,164