Investment Securities - Additional Information (Details)	3 Months Ended
Mar. 31, 2021 USD ($) position	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) position
Investments, Debt and Equity Securities [Abstract]
Equity securities	$ 32,973,000		$ 29,378,000
Number of security positions in the debt securities available for sale portfolio in an unrealized loss position \| position	61		58
Fair value of debt securities available for sale pledged as collateral	$ 691,400,000
Weighted-average remaining expected life of residential mortgage-backed securities available for sale, years	3 years 4 months 24 days
Number of security positions in the securities held to maturity portfolio in an unrealized loss position \| position	39		13
Fair value of investments held to maturity pledged as collateral	$ 1,500,000,000
Weighted-average remaining expected life of residential mortgage-backed securities held to maturity, years	5 years 9 months 18 days
Held to maturity debt securities, allowance for credit losses	$ 1,070,000		$ 1,428,000
Held to maturity debt securities, (credit) provision for credit losses	(358,000)	$ 759,000
Charge-offs of debt securities	$ 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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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Amount of writeoff of investment in debt security, measured at amortized cost (held-to-maturity), charged against allowance for credit loss.

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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

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Amount of restricted investment in debt security measured at amortized cost (held-to-maturity).

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Weighted-average remaining expected life of residential mortgage-backed securities available for sale

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Weighted-average remaining expected life of residential mortgage-backed securities held to maturity

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