Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($)
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	429	541
Debt securities, available-for-sale, allowance for credit loss	$ 1,900,000	$ 0
Allowance for credit losses on available-for-sale debt securities	1,900,000	0	$ 0
Allowance for credit losses	0	0
Asset Pledged as Collateral
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
AFS and HTM debt securities carrying value	4,600,000,000	$ 5,400,000,000
Prepositioned For Federal Reserve Bank Standing Repurchase Agreement Facility
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
AFS and HTM debt securities carrying value	$ 4,600,000,000
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	222	290
Corporate debt securities
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	47	66
Debt securities, available-for-sale, allowance for credit loss	$ 0
Non-agency mortgage-backed securities
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Number of available-for-sale debt securities in an unrealized loss position | security	66	83
Debt securities, available-for-sale, allowance for credit loss	$ 2,000,000
Allowance for credit losses on available-for-sale debt securities	$ 2,000,000