Investment Securities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) position	Dec. 31, 2023 USD ($) position	Mar. 31, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 66,951,000	$ 64,464,000
Trading debt securities	3,989,000	3,973,000
Debt securities, trading, realized gain	56,000		$ 402,000
Accrued interest on investments available for sale	$ 6,200,000	$ 5,900,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position | position	694	687
Fair value of debt securities available for sale pledged as collateral	$ 1,100,000,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years	7 years 10 months 17 days
Impairment loss	$ 0		0
Allowance for credit loss, not previously recorded			$ 5,000,000
Gain on sale of investments		$ 869,000
Allowance for credit losses for available for sale debt securities	0	0
Accrued interest on securities held to maturity	$ 12,500,000	$ 13,900,000
Number of security positions in the securities held to maturity portfolio in an unrealized loss position | position	784	762
Fair value of investments held to maturity pledged as collateral	$ 2,700,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years	10 years 9 months 25 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
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued interest receivable	Accrued interest receivable