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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 542,481	$ 505,737	$ 483,933
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,006	852	900
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	49,377	48,491	59,121
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	140,201	132,372	99,261
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	242,212	221,073	220,698
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	72,444	67,394	71,651
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	7,203	6,156	12,030
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	29,915	29,399	20,272
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	0	0
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	306,490	302,506	303,312
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	33,605	25,406	18,439
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	173,691	150,769	136,651
Commercial | 1 Strong | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2	2	3
Commercial | 1 Strong | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 1 Strong | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,004	850	897
Commercial | 2 Above Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	13,737	13,981	27,602
Commercial | 2 Above Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	45	49	54
Commercial | 2 Above Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	7,700	8,934	7,567
Commercial | 3 Satisfactory | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	84,550	81,286	71,595
Commercial | 3 Satisfactory | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,827	1,345	995
Commercial | 3 Satisfactory | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	52,024	48,212	25,038
Commercial | 4 Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	140,826	139,421	136,010
Commercial | 4 Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	20,849	16,506	11,769
Commercial | 4 Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	80,537	65,146	72,919
Commercial | 5 Watch | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	46,158	43,181	41,328
Commercial | 5 Watch | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	9,884	7,349	5,621
Commercial | 5 Watch | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	16,402	16,864	24,702
Commercial | 6 OAEM | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,283	4,569	9,443
Commercial | 6 OAEM | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 6 OAEM | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,920	1,587	2,587
Commercial | 7 Substandard | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	17,811	20,066	17,331
Commercial | 7 Substandard | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	157	0
Commercial | 7 Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	12,104	9,176	2,941
Commercial | 8 Doubtful | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	0	0
Commercial | 8 Doubtful | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 8 Doubtful | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	28,695	27,056	25,531
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	27,895	25,527	23,898
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	800	1,529	1,633
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 0	$ 0	$ 0

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