CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
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 income/(loss) 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 Class C Common Stock (in shares)			22
Issuance of Class C 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 income/(loss) 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 income/(loss) 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 Class C Common Stock (in shares)			9
Issuance of Class C 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 income/(loss) 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 Class C Common Stock (in shares)			3
Issuance of Class C 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
Beginning balance ( in shares) at Dec. 31, 2022		19,980	10,801
Beginning balance at Dec. 31, 2022	1,271,958	$ 484,531	$ 10,801	128,939	(50,843)	698,530
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	47,035					47,035
Other comprehensive income/(loss) net of tax	(9,019)				(9,019)
Cash dividends, preferred stock	(6,791)					(6,791)
Cash dividends, common stock	(11,882)					(11,882)
Issuance of Class C Common Stock (in shares)			19
Issuance of Class C Common Stock	70		$ 19	51
Stock-based compensation cost	2,254			2,254
Other stock-based award activity	(1,240)			(1,240)
Ending balance (in shares) at Mar. 31, 2023		19,980	10,820
Ending balance at Mar. 31, 2023	1,292,385	$ 484,531	$ 10,820	130,004	(59,862)	726,892
Beginning balance ( in shares) at Dec. 31, 2022		19,980	10,801
Beginning balance at Dec. 31, 2022	1,271,958	$ 484,531	$ 10,801	128,939	(50,843)	698,530
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	152,384
Other comprehensive income/(loss) net of tax	15,004
Ending balance (in shares) at Sep. 30, 2023		19,980	10,840
Ending balance at Sep. 30, 2023	1,385,267	$ 484,531	$ 10,840	130,921	(35,839)	794,814
Beginning balance ( in shares) at Mar. 31, 2023		19,980	10,820
Beginning balance at Mar. 31, 2023	1,292,385	$ 484,531	$ 10,820	130,004	(59,862)	726,892
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	47,212					47,212
Other comprehensive income/(loss) net of tax	25,511				25,511
Cash dividends, preferred stock	(6,791)					(6,791)
Cash dividends, common stock	(11,921)					(11,921)
Issuance of Class C Common Stock (in shares)			16
Issuance of Class C Common Stock	70		$ 16	54
Stock-based compensation cost	1,223			1,223
Other stock-based award activity	(1,134)			(1,134)
Ending balance (in shares) at Jun. 30, 2023		19,980	10,836
Ending balance at Jun. 30, 2023	1,346,555	$ 484,531	$ 10,836	130,147	(34,351)	755,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	58,137					58,137
Other comprehensive income/(loss) net of tax	(1,488)				(1,488)
Cash dividends, preferred stock	(6,792)					(6,792)
Cash dividends, common stock	(11,923)					(11,923)
Issuance of Class C Common Stock (in shares)			4
Issuance of Class C Common Stock	68		$ 4	64
Stock-based compensation cost	1,221			1,221
Other stock-based award activity	(511)			(511)
Ending balance (in shares) at Sep. 30, 2023		19,980	10,840
Ending balance at Sep. 30, 2023	$ 1,385,267	$ 484,531	$ 10,840	$ 130,921	$ (35,839)	$ 794,814