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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 540,417 | $ 505,737 | $ 473,987
1 Strong |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 868 | 852 | 723
2 Above Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 53,155 | 48,491 | 58,416
3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 130,933 | 132,372 | 98,499
4 Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 244,519 | 221,073 | 214,410
5 Watch |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 73,365 | 67,394 | 70,496
6 OAEM |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 7,363 | 6,156 | 11,317
7 Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 30,091 | 29,399 | 20,126
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 | 301,227 | 302,506 | 297,808
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 32,893 | 25,406 | 18,828
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 172,986 | 150,769 | 131,198
Commercial | 1 Strong | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 2 | 2
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 | 868 | 850 | 721
Commercial | 2 Above Average | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 13,051 | 13,981 | 24,225
Commercial | 2 Above Average | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 43 | 49 | 53
Commercial | 2 Above Average | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 7,501 | 8,934 | 9,546
Commercial | 3 Satisfactory | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 76,533 | 81,286 | 72,082
Commercial | 3 Satisfactory | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 3,763 | 1,345 | 824
Commercial | 3 Satisfactory | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 49,886 | 48,212 | 24,032
Commercial | 4 Average | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 146,424 | 139,421 | 133,835
Commercial | 4 Average | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 18,685 | 16,506 | 12,764
Commercial | 4 Average | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 79,410 | 65,146 | 67,811
Commercial | 5 Watch | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 44,773 | 43,181 | 41,120
Commercial | 5 Watch | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 10,402 | 7,349 | 5,187
Commercial | 5 Watch | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 18,190 | 16,864 | 24,189
Commercial | 6 OAEM | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,738 | 4,569 | 9,360
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 | 4,625 | 1,587 | 1,957
Commercial | 7 Substandard | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 17,585 | 20,066 | 17,184
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 | 12,506 | 9,176 | 2,942
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 | 33,311 | 27,056 | 26,153
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 | 32,560 | 25,527 | 24,592
Municipal | 3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 751 | 1,529 | 1,561
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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