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Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 10,138	$ 9,916	$ 10,344	$ 11,514
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,988	3,120	3,532	4,602
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	396	580	823	575
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,780	1,452	1,505	2,276
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	18	17	15	15
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	44	24	20	21
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,288	1,391	1,185	1,099
Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	807	893	1,060	675
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	559	566	542	573
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,258	1,873	$ 1,662	$ 1,678
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	974	754
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	505	89
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	100	302
Specific Reserves on Loans Evaluated Individually for Impairment | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	39	8
Specific Reserves on Loans Evaluated Individually for Impairment | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	304	326
Specific Reserves on Loans Evaluated Individually for Impairment | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	26	29
Specific Reserves on Loans Evaluated Individually for Impairment | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Specific Reserves on Loans Evaluated Individually for Impairment | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,691	2,858
General Reserves on Loans Based on Historical Loss Experience | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,471	893
General Reserves on Loans Based on Historical Loss Experience | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	125	82
General Reserves on Loans Based on Historical Loss Experience | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	735	425
General Reserves on Loans Based on Historical Loss Experience | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
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]
Allowance for loan losses	25	14
General Reserves on Loans Based on Historical Loss Experience | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	563	613
General Reserves on Loans Based on Historical Loss Experience | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	444	500
General Reserves on Loans Based on Historical Loss Experience | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	328	331
General Reserves on Loans Based on Historical Loss Experience | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	4,215	4,431
Reserves for Qualitative Factors | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,012	2,138
Reserves for Qualitative Factors | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	171	196
Reserves for Qualitative Factors | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,006	1,019
Reserves for Qualitative Factors | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	18	17
Reserves for Qualitative Factors | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	19	10
Reserves for Qualitative Factors | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	421	452
Reserves for Qualitative Factors | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	337	364
Reserves for Qualitative Factors | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	231	235
Reserves for Qualitative Factors | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,258	1,873
Unallocated Reserves | Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Home Equity LIne of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0
Unallocated Reserves | Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,258	$ 1,873

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
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