Investment Securities - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) security	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) security	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 60,755,000		$ 60,755,000		$ 49,611,000
Trade date receivables settled after period end	0		0		0
Trade date payables settled after period end	25,036,000		25,036,000		0
Allowance for credit losses on investments	$ 0		$ 0		$ 0
Number of securities in securities portfolio | security	322		322		271
Number of securities in securities portfolio, unrealized loss position | security	214		214		248
Equity securities, at fair value	$ 1,450,000		$ 1,450,000		$ 0
Net loss on change in fair value and sale of equity securities	12,000	$ 0	12,000	$ 0
Equity securities without a readily determinable market value	28,703,000		28,703,000		23,459,000
Equity method investments	18,237,000		18,237,000		19,970,000
Equity method goodwill	17,103,000		17,103,000
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged	818,235,000		818,235,000		937,043,000
Debt Securities
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 5,246,000		$ 5,246,000		$ 6,401,000