Investment Securities - Narrative (Details)	Mar. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security	Mar. 31, 2024 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 51,268,000	$ 49,611,000
Trade date receivables settled after period end	0	0
Trade date payables settled after period end	0	0
Allowance for credit losses on investments	$ 0	$ 0
Number of securities in securities portfolio | security	277	271
Number of securities in securities portfolio, unrealized loss position | security	251	248
Equity securities without a readily determinable market value	$ 23,923,000	$ 23,459,000
Federal home loan bank stock	32,234,000	32,749,000
Equity method investments	19,475,000	19,970,000
Goodwill	242,561,000	242,561,000	$ 242,561,000
Equity Method Investments
Debt and Equity Securities, FV-NI [Line Items]
Goodwill	17,103,000
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged	877,603,000	937,043,000
Debt Securities
Debt and Equity Securities, FV-NI [Line Items]
Accrued interest receivable	$ 5,208,000	$ 6,401,000