Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Allowance for credit losses on loans and leases		$ 1,435,920	$ 1,339,772	$ 1,357,075	$ 1,165,335
Liability for unfunded commitments		84,568	112,962	124,924	$ 72,713
Deferred tax asset		465,379	433,581
Unrealized gain (loss)		(83,000)	(115,000)
Gain (loss) OCI after adjustment tax		(27,000)	(37,000)
Dividends		$ 570,000	$ 550,000	$ 700,000
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