Parent Company Financial Information - Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income
Noninterest income	$ 82,838	$ (173,918)	$ 88,748
Expense
Interest expense	19,546	18,244	18,242
Compensation and benefits	211,057	213,692	225,245
Other noninterest expense	402,531	406,951	396,670
Income before income tax provision	212,469	34,041	384,358
Income tax benefit	53,667	3,189	100,615
Net income allocated to common stockholders	155,942	28,791	280,338
Corporation
Income
Dividend income from the Bank	219,108	199,653	131,160
Interest income	113	93	7
Noninterest income	52	0	0
Total income	219,273	199,746	131,167
Expense
Interest expense	19,546	18,244	18,242
Compensation and benefits	3,780	3,934	5,198
Other noninterest expense	4,217	3,785	3,881
Total expense	27,543	25,963	27,321
Income before income tax provision	191,730	173,783	103,846
Income tax benefit	(7,763)	(7,240)	(7,793)
Income before undistributed income of subsidiary	199,493	181,023	111,639
Equity in undistributed (losses) earnings of subsidiary	(40,691)	(150,171)	172,104
Net income allocated to common stockholders	$ 158,802	$ 30,852	$ 283,743