Investment Securities - Additional Information (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2021 USD ($) position	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) position	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) position
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 33,870,000		$ 33,870,000		$ 29,378,000
Trading debt securities	21,216,000		21,216,000		$ 0
Net trading gain on trading securities	$ 489,000		$ 707,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position \| position	67		67		58
Fair value of debt securities available for sale pledged as collateral	$ 736,200,000		$ 736,200,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years			4 years 4 months 24 days
Number of security positions in the securities held to maturity portfolio in an unrealized loss position \| position	44		44		13
Fair value of investments held to maturity pledged as collateral	$ 1,600,000,000		$ 1,600,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years			6 years
Held to maturity debt securities, allowance for credit losses	1,000,000.0		$ 1,000,000.0		$ 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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