Investment Securities - Additional Information (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) position
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 36,068,000		$ 36,068,000		$ 29,378,000
Trading debt securities	4,797,000		4,797,000		$ 0
Net trading gains (losses) on trading securities	$ (2,000)		$ 705,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position \| position	111		111		58
Fair value of debt securities available for sale pledged as collateral	$ 547,500,000		$ 547,500,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years			4 years 10 months 24 days
Number of security positions in the securities held to maturity portfolio in an unrealized loss position \| position	62		62		13
Fair value of investments held to maturity pledged as collateral	$ 955,900,000		$ 955,900,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years			5 years 10 months 24 days
Held to maturity debt securities, allowance for credit losses	1,100,000		$ 1,100,000		$ 1,400,000
Charge-offs of debt securities	$ 0	$ 0	$ 0	$ 0

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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