Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Retained earnings	$ 3,270,896		$ 2,817,134				$ 952,639
Allowance for credit losses							1,143,053
Liability for unfunded commitments	107,794	$ 113,525	72,713	$ 99,131	$ 64,772	$ 110,044	115,758
Deferred tax asset							306,171
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Liability for unfunded commitments							116,000
Deferred tax asset							$ 306,000
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
Adjusted Transition Amounts | Accounting Standards Update 2016-13
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