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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 6,721	$ 16,649
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	543	1,784
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	89	256
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,481	6,534
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	3,593	5,899
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	1,015	2,171
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 0	$ 5

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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