Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Allowance for credit losses on loans and leases		$ 1,194,238	$ 1,215,407	$ 1,194,238	$ 1,215,407	$ 1,081,066	$ 1,165,335	$ 1,160,244	$ 1,361,723
Liability for unfunded commitments	$ 115,758	107,794	99,131	107,794	99,131	$ 113,525	$ 72,713	$ 64,772	$ 110,044
Deferred tax asset	$ 306,171
Dividends		$ 241,000	$ 50,000	$ 642,000	$ 1,200,000
Accounting Standards Update 2016-13
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Period of deferment	2 years
Amount deferred	25.00%
Allowance for credit losses on loans and leases	$ 1,100,000
Liability for unfunded commitments	116,000
Deferred tax asset	306,000
Reduction to retained earnings	$ 953,000