Parent Company Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income
Net loss on debt extinguishment	$ 0	$ (180)	$ 0
Expense
Interest expense	18,242	22,449	20,647
Compensation and benefits	225,245	215,690	180,452
Other noninterest expense	396,670	380,277	381,119
Net income before income taxes	384,358	460,823	72,601
Income tax benefit	100,615	120,934	12,250
Net income allocated to common stockholders	280,338	336,372	59,553
Corporation
Income
Dividend income from the Bank	131,160	121,653	29,874
Interest income	7	9	22
Net loss on debt extinguishment	0	(2,877)	0
Total income	131,167	118,785	29,896
Expense
Interest expense	18,242	18,907	16,596
Compensation and benefits	5,198	3,845	3,205
Other noninterest expense	3,881	3,808	4,929
Total expense	27,321	26,560	24,730
Net income before income taxes	103,846	92,225	5,166
Income tax benefit	(7,793)	(8,672)	(6,734)
Income before undistributed income of subsidiary	111,639	100,897	11,900
Equity in undistributed earnings of subsidiary	172,104	238,992	48,451
Net income allocated to common stockholders	$ 283,743	$ 339,889	$ 60,351