Investment Securities - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) position	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) position	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) position
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 78,296,000		$ 78,296,000		$ 71,513,000
Accrued interest on investments available for sale	$ 17,000,000		$ 17,000,000		$ 13,100,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position | position	630		630		726
Fair value of debt securities available for sale pledged as collateral	$ 988,100,000		$ 988,100,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years			7 years 5 months 12 days
Impairment loss	0	$ 0	$ 0	$ 0
Allowance for credit losses for available for sale debt securities	0		0		$ 0
Accrued interest on securities held to maturity	$ 11,900,000		$ 11,900,000		$ 13,000,000
Number of security positions in the securities held to maturity portfolio in an unrealized loss position | position	704		704		798
Fair value of investments held to maturity pledged as collateral	$ 1,200,000,000		$ 1,200,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years			8 years 10 months 17 days
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable		Accrued interest receivable		Accrued interest receivable
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable		Accrued interest receivable		Accrued interest receivable