Consolidated Statements of Changes in Shareholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2020	$ 2,972,656	$ 0	$ 165,367	$ 1,875,626	$ 783,892	$ 147,771
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	86,818				86,818
Other comprehensive income (loss)	(55,862)					(55,862)
Issuance of common stock		0	0
Dividends - common stock	(23,195)				(23,195)
Common stock issued	139		9	130
Common stock repurchased	(2,856)		(160)	(2,696)
Share-based compensation expense	1,747			1,747
Stock activity under incentive compensation plans	0		460	(235)	(225)
Balance at end of period at Mar. 31, 2021	2,979,447	0	165,676	1,874,572	847,290	91,909
Balance at beginning of period at Dec. 31, 2021	3,012,018	0	165,838	1,880,545	968,010	(2,375)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(27,586)				(27,586)
Other comprehensive income (loss)	(335,824)					(335,824)
Issuance of common stock	2,446,312	243,870	129,365	2,316,947
Issuance of preferred stock, net of issuance costs	243,719	230,500		13,219
Dividends - common stock	(40,782)				(40,782)
Preferred dividends	(2,017)				(2,017)
Common stock issued	165		10	155
Common stock repurchased	(70,078)		(3,890)	(66,188)
Share-based compensation expense	6,284			6,284
Stock activity under incentive compensation plans	(97)		1,636	(1,368)	(365)
Balance at end of period at Mar. 31, 2022	$ 5,232,114	$ 230,500	$ 292,959	$ 4,149,594	$ 897,260	$ (338,199)