Parent Company Information - Schedule of Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income
Income tax (benefit) expense	$ 166,899	$ 139,460	$ 147,002
Net Income	473,840	390,606	309,793
Dividends on preferred stock	12,688	12,688	12,688
Net Income Available to Common Shareholders	461,152	377,918	297,105
Parent Company
Income
Dividends from subsidiary	150,000	186,000	160,000
Income from subsidiary	0	4,436	4,550
Other interest and income	1,498	21	51
Total Income	151,498	190,457	164,601
Total Expenses	28,524	23,484	27,998
Income before income tax and equity in undistributed earnings of subsidiary	122,974	166,973	136,603
Income tax (benefit) expense	(9,501)	(3,946)	24,524
Income before equity in undistributed earnings of subsidiary	132,475	170,919	112,079
Equity in undistributed earnings of subsidiary	341,365	219,687	197,714
Net Income	473,840	390,606	309,793
Dividends on preferred stock	12,688	12,688	12,688
Net Income Available to Common Shareholders	$ 461,152	$ 377,918	$ 297,105