CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI Attributable to Parent
Common Stock, Dividends, Per Share, Cash Paid	$ 0.22
Preferred Stock, Dividends, Per Share, Cash Paid	$ 16.88
Balance at Dec. 31, 2021	$ 5,310,607	$ 217,126	$ 76,143	$ 3,045,802	$ 1,864,350	$ 107,186
Balance (in shares) at Dec. 31, 2021			76,143,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options & related tax benefits	(130)		$ (6)	(124)
Exercise of employee common stock options and related tax benefits (in shares)			6,000
Preferred dividends paid	(3,798)				(3,798)
Common dividends paid	(16,976)				(16,976)
Issuance of restricted common shares, net of forfeitures	0		$ 158	(158)
Issuance of restricted common shares, net of forfeitures (in shares)			158,000
Restricted shares withheld for taxes & related benefits	(3,771)		$ (35)	(3,736)
Restricted shares withheld for taxes (in shares)			(35,000)
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits	5,461		$ (105)	5,566
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)			(105,000)
Stock-based compensation expense	9,448			9,448
Net income	129,110				129,110
Other comprehensive income (loss)	(138,339)					(138,339)
Balance at Mar. 31, 2022	$ 5,280,950	217,126	$ 76,377	3,045,914	1,972,686	(31,153)
Balance (in shares) at Mar. 31, 2022			76,377,000
Common Stock, Dividends, Per Share, Cash Paid	$ 0.22
Preferred Stock, Dividends, Per Share, Cash Paid	$ 16.88
Balance at Dec. 31, 2022	$ 5,519,392	217,126	$ 76,454	3,074,867	2,341,706	(190,761)
Balance (in shares) at Dec. 31, 2022			76,454,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of employee common stock options & related tax benefits	(960)		$ (40)	(920)
Exercise of employee common stock options and related tax benefits (in shares)			40,000
Preferred dividends paid	(3,798)				(3,798)
Common dividends paid	(17,173)				(17,173)
Issuance of restricted common shares, net of forfeitures	0		$ 193	(193)
Issuance of restricted common shares, net of forfeitures (in shares)			193,000
Restricted shares withheld for taxes & related benefits	(3,076)		$ (41)	(3,035)
Restricted shares withheld for taxes (in shares)			(41,000)
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes & related tax benefits	3,645		$ (93)	3,738
Issuance of common stock pursuant to restricted stock unit agreement, net of shares withheld for taxes and related tax benefit (in shares)			(93,000)
Stock-based compensation expense	10,199			10,199
Net income	137,271				137,271
Other comprehensive income (loss)	43,998					43,998
Balance at Mar. 31, 2023	$ 5,684,128	$ 217,126	$ 76,739	$ 3,079,020	$ 2,458,006	$ (146,763)
Balance (in shares) at Mar. 31, 2023			76,739,000