Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Allowance for credit losses on loans and leases		$ 1,227,362	$ 1,179,021	$ 1,165,335	$ 1,361,723
Liability for unfunded commitments	$ 115,758	32,707	19,367	$ 72,713	$ 110,044
Deferred tax asset	$ 306,171
Dividends		$ 108,000	$ 1,000,000
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