Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	$ 3,624,859	$ 3,163,640
Allowance for credit losses	1,339,772	1,357,075	$ 1,165,335	$ 1,361,723
Liability for unfunded commitments	112,962	124,924	72,713	$ 110,044
Cumulative Effect, Period Of Adoption, Adjusted Phase-In Amounts Remaining
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	418,175		836,351
Allowance for credit losses	519,073		1,038,145
Liability for unfunded commitments	52,189		104,377
Deferred tax asset	153,087		$ 306,171
Adjustments
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	(209,088)	(209,088)
Allowance for credit losses	(259,536)	(259,536)
Liability for unfunded commitments	(26,094)	(26,094)
Deferred tax asset	$ (76,542)	$ (76,542)