Investment Securities - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2024 USD ($) position	Dec. 31, 2023 USD ($) position	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) position	Sep. 30, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 73,071,000	$ 64,464,000		$ 73,071,000
Trading debt securities	3,996,000	3,973,000		3,996,000
Debt securities, trading, realized gain				111,000	$ 673,000
Accrued interest on investments available for sale	$ 10,100,000	$ 5,900,000		$ 10,100,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position | position	656	687		656
Fair value of debt securities available for sale pledged as collateral	$ 2,100,000,000			$ 2,100,000,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years				6 years 10 months 24 days
Impairment loss	0			$ 0
Allowance for credit loss, not previously recorded			$ 5,000,000.0
Gain on sale of investments		$ 869,000
Allowance for credit losses for available for sale debt securities	0	0		0	$ 0
Accrued interest on securities held to maturity	$ 12,300,000	$ 13,900,000		$ 12,300,000
Number of security positions in the securities held to maturity portfolio in an unrealized loss position | position	733	762		733
Fair value of investments held to maturity pledged as collateral	$ 2,700,000,000			$ 2,700,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years				9 years 2 months 15 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