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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 6,981	$ 6,721	$ 8,344
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,029	543	1,245
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	105	89	232
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,452	1,481	323
Municipal
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Term
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	3,820	3,593	4,685
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	575	1,015	1,854
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 0	$ 5

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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