Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	$ 3,163,640	$ 2,817,134		$ 952,639	$ 1,850,512
Allowance for credit losses	1,357,075	1,165,335	$ 1,361,723	1,143,053	441,912
Liability for unfunded commitments	124,924	72,713	110,044	115,758	2,481
Deferred tax asset				306,171
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Allowance for credit losses				1,100,000
Liability for unfunded commitments				116,000
Deferred tax asset				306,000
Adjustments
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings				(952,639)
Allowance for credit losses			1,143,053	1,143,053
Liability for unfunded commitments			0	$ 115,758	$ 115,758
Adjustments | Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	(209,088)	(58,429)	(57,859)
Allowance for credit losses	(259,536)	(49,097)	(55,811)
Liability for unfunded commitments	(26,094)	(9,333)	(2,048)
Deferred tax asset	(76,542)	$ 0	$ 0
Adjustments | Accounting Standards Update 2016-13 | Remaining Adjusted Transition Amounts to be Phased-In
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	627,263
Allowance for credit losses	778,609
Liability for unfunded commitments	78,283
Deferred tax asset	$ 229,629