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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 16,253	$ 11,639	$ 11,232	$ 10,729
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	5,178	3,742	3,567	3,872
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	662	365	255	434
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	3,438	3,329	3,541	3,358
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	171	27	24	20
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	102	25	34	36
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,579	1,024	1,235	1,130
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,211	1,078	730	692
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	778	867	630	545
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,134	1,182	$ 1,216	$ 642
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	462	2,213
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	112	251
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	18	0
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	169	1,273
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	163	237
Specific Reserves on Loans Evaluated Individually for Impairment | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	447
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	5
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,862	1,983
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	721	729
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	92	76
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	465	430
General Reserves on Loans Based on Historical Loss Experience | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	6	5
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	145	153
General Reserves on Loans Based on Historical Loss Experience | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	151	130
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	282	460
General Reserves on Loans Based on Historical Loss Experience | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	11,795	6,261
Reserves for Qualitative Factors | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	4,345	2,762
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	552	289
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,804	1,626
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	171	27
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	96	20
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,271	634
Reserves for Qualitative Factors | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,060	501
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	496	402
Reserves for Qualitative Factors | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	2,134	1,182
Unallocated Reserves | Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	0	0
Unallocated Reserves | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 2,134	$ 1,182

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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-Publisher FASB
-Name Accounting Standards Codification
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