Investment Securities - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2026	Mar. 31, 2025	May 15, 2026	May 08, 2026	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Net gains		$ 100
Realized gains		800
Unrealized gain (loss)		$ (700)
Debt securities available-for-sale, accrued interest					$ 27,300	$ 25,100
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]						Other assets
Money market funds, at carrying value					3,460,000	$ 4,060,000
Allowance for credit losses					10	10
Fair value of securities					$ 4,300	$ 4,900
Visa Class B-2 Shares
Debt Securities, Available-for-sale [Line Items]
Shares owned (in shares)					33,010
Visa Class B-2 Shares | Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Shares owned (in shares)			33,010
Class C Common Stock Owned | Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Unrealized gain (loss)	$ 8,000
Visa Class B-3 Shares | Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Shares owned (in shares)			16,505
Investment owned, principal amount			$ 0
Visa Class A Shares | Subsequent Event
Debt Securities, Available-for-sale [Line Items]
Investment owned price (in USD per share)				$ 318.79