Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	$ 4,114,446	$ 3,624,859
Allowance for loan losses	1,435,920	1,339,772	$ 1,357,075	$ 1,165,335
Liability for unfunded commitments	84,568	112,962	124,924	72,713
Deferred tax asset	465,379	433,581
Cumulative Effect, Period Of Adoption, Adjusted Phase-In Amounts Remaining
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	209,087			836,351
Allowance for loan losses	259,537			1,038,145
Liability for unfunded commitments	26,094			104,377
Deferred tax asset	76,544			$ 306,171
Adjustments
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	(209,088)	(209,088)	(209,088)
Allowance for loan losses	(259,536)	(259,536)	(259,536)
Liability for unfunded commitments	(26,095)	(26,094)	(26,094)
Deferred tax asset	$ (76,543)	$ (76,542)	$ (76,542)