Securities - Narrative (Details)	3 Months Ended
	Mar. 31, 2026 USD ($) security	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	467		429
Debt securities, available-for-sale, allowance for credit loss	$ 0		$ 1,900,000
Reversal of credit losses recognized related to the sale of security	192,000	$ 0
Allowance for credit losses on available-for-sale debt securities		$ 0
Allowance for credit losses on held-to-maturity debt securities	0		0
Asset Pledged as Collateral
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
AFS and HTM debt securities carrying value	4,900,000,000		4,600,000,000
Prepositioned for Federal Reserve Bank Standing Repurchase Agreement Facility
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
AFS and HTM debt securities carrying value	$ 6,900,000,000		$ 4,800,000,000
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	261		222
Corporate debt securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	45		47
Debt securities, available-for-sale, allowance for credit loss			$ 0
Non-agency mortgage-backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	61		66