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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 14,110	$ 11,858	$ 11,639	$ 11,471	$ 11,490	$ 11,232
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	917		2,213	1,830
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,814		1,983	1,956
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10,370		6,261	5,849
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,009		1,182	1,836
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	4,511	3,862	3,742	3,609	3,632	3,567
Commercial |    Real estate | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	199		251	196
Commercial |    Real estate | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	631		729	789
Commercial |    Real estate | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,681		2,762	2,624
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	524	424	365	309	325	255
Commercial |    Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	20		0	0
Commercial |    Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	74		76	72
Commercial |    Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	430		289	237
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,689	2,427	3,329	3,281	3,430	3,541
Commercial |    Other | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	132		1,273	1,320
Commercial |    Other | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	521		430	457
Commercial |    Other | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,036		1,626	1,504
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	110	29	27	25	25	24
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	110		27	25
Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	64	32	25	23	30	34
Residential |    Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential |    Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	9		5	6
Residential |    Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	55		20	17
Residential |    Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,261	1,226	1,024	1,106	1,114	1,235
Residential |    Term | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	269		237	305
Residential |    Term | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	285		153	197
Residential |    Term | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,707		634	604
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,284	1,012	1,078	633	630	730
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	292		447	9
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	99		130	156
Home equity line of credit | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	893		501	468
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	658	725	867	649	660	630
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5		5	0
Consumer | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	195		460	279
Consumer | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	458		402	370
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,009	$ 2,121	1,182	1,836	$ 1,644	$ 1,216
Unallocated | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,009		$ 1,182	$ 1,836

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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