Investment Securities - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Unrealized gain (loss)		$ 4,600,000	$ (700,000)	$ (1,300,000)
Net gains			100,000	14,700,000
Realized gains			800,000	16,000,000.0
Proceeds from sales of available-for-sale securities			315,180,000	1,044,686,000
Loss on available-for-sale securities			6,900,000	51,200,000
Money market funds, at carrying value			4,060,000,000.00	3,880,000,000
Fair value of securities			4,900,000	2,200,000
Debt securities available-for-sale, accrued interest			$ 25,100,000	$ 22,000,000.0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]			Other assets	Other assets
Allowance for credit losses			$ 10,000	$ 21,000
Visa Class B-1 Shares
Debt Securities, Available-for-sale [Line Items]
Number of shares held (in shares)				66,020
Investment owned fair value				$ 0
Visa Class B-2 Shares
Debt Securities, Available-for-sale [Line Items]
Number of shares held (in shares)		33,010
Investment owned fair value		$ 0
Common shares received (in shares)				33,010
Visa Class C Shares
Debt Securities, Available-for-sale [Line Items]
Common shares received (in shares)				13,100
Visa Class A Shares
Debt Securities, Available-for-sale [Line Items]
Number of shares converted (in shares)				4
Number of shares sold (in shares)	17,472	34,928
Pre-tax gains	$ 4,500,000	$ 9,700,000