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Allowance for Loan Losses - Composition of Allowance for Loans Losses, by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	$ 2,308	$ 1,812	$ 974
Allowance for Loans Evaluated Collectively for Impairment	8,924	8,917	9,164
Total Allowance for Loan Losses	11,232	10,729	10,138	$ 9,916
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	260	224	505
Allowance for Loans Evaluated Collectively for Impairment	3,307	3,648	3,483
Total Allowance for Loan Losses	3,567	3,872	3,988	3,120
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	100
Allowance for Loans Evaluated Collectively for Impairment	255	434	296
Total Allowance for Loan Losses	255	434	396	580
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	1,696	1,309	39
Allowance for Loans Evaluated Collectively for Impairment	1,845	2,049	1,741
Total Allowance for Loan Losses	3,541	3,358	1,780	1,452
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	24	20	18
Total Allowance for Loan Losses	24	20	18	17
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	34	36	44
Total Allowance for Loan Losses	34	36	44	24
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	335	255	304
Allowance for Loans Evaluated Collectively for Impairment	900	875	984
Total Allowance for Loan Losses	1,235	1,130	1,288	1,391
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	17	24	26
Allowance for Loans Evaluated Collectively for Impairment	713	668	781
Total Allowance for Loan Losses	730	692	807	893
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	630	545	559
Total Allowance for Loan Losses	630	545	559	566
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0	0	0
Allowance for Loans Evaluated Collectively for Impairment	1,216	642	1,258
Total Allowance for Loan Losses	$ 1,216	$ 642	$ 1,258	$ 1,873

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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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-Publisher FASB
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