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Commitments and Contingencies - (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2034	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2020	Dec. 31, 2017
Investments in Affordable Housing Limited Entities	$ 96,400,000	$ 92,700,000
Affordable Housing Tax Credits and Other Tax Benefits, Amount	7,500,000	5,700,000	$ 2,400,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization	6,500,000	5,000,000.0	3,100,000
Qualified Affordable Housing Project Investments, Commitment	53,800,000	50,700,000
Impairment losses on LIHTC investments	0	0	0
Carrying value of NMTC	25,200,000	25,400,000
Investment income	694,000	701,000	708,000
Allowance for credit losses on loans	70,185,000	36,171,000					$ 37,993,000
Unused Commitments to Extend Credit [Member]
Allowance for credit losses on loans	4,681,000	306,000	306,000					$ 170,000
Unused Commitments to Extend Credit [Member] | Cumulative Effect, Period of Adoption, Adjustment
Allowance for credit losses on loans		$ 3,702,000	$ 0					$ 0
Forecast [Member]
Qualified Affordable Housing Project Investments, Future Commitment				$ 6,200,000	$ 9,700,000	$ 37,900,000
Twenty Twenty [Member] | Subsidiaries [Member] | Investment Tax Credit Carryforward [Member]
Gross tax credits related to the Company's CDEs	$ 9,800,000

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