Investment Securities - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) position	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) position	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) position
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 41,716,000		$ 41,716,000		$ 36,473,000
Trading debt securities	0		0		$ 38,130,000
Debt securities, trading, realized gain	$ 387,000		$ 1,400,000
Debt securities, trading, realized loss		$ 489,000		$ 707,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position | position	655		655		139
Fair value of debt securities available for sale pledged as collateral	$ 446,400,000		$ 446,400,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years			5 years 3 months 18 days
Impairment loss	0			0
Available for sale debt securities, allowance for credit losses	$ 0		$ 0		$ 0
Number of security positions in the securities held to maturity portfolio in an unrealized loss position | position	717		717		108
Fair value of investments held to maturity pledged as collateral	$ 892,600,000		$ 892,600,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years			7 years 8 months 12 days
Allowance for credit losses, excluding accrued interest	1,508,000		$ 1,508,000		$ 1,165,000
Provision (credit) for credit losses for held to maturity securities	$ 286,000	$ (30,000)	$ 343,000	$ (388,000)