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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 6,145	$ 6,721	$ 9,111
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	604	543	1,771
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	23	89	307
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,251	1,481	503
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	3,785	3,593	4,467
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	482	1,015	2,063
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 0	$ 0

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