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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 432,839 | $ 398,198 | $ 389,263
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 268,741 | 242,311 | 243,936
Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 23,624 | 30,932 | 26,954
Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 119,097 | 104,531 | 97,651
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 21,377 | 20,424 | 20,722
1 Strong |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 796 | 342 | 314
1 Strong | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 8 | 12 | 14
1 Strong | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
1 Strong | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 788 | 330 | 300
1 Strong | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
2 Above Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 55,584 | 39,438 | 39,115
2 Above Average | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 26,881 | 12,668 | 11,646
2 Above Average | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 58 | 771 | 1,189
2 Above Average | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 8,753 | 7,210 | 7,246
2 Above Average | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 19,892 | 18,789 | 19,034
3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 84,071 | 78,125 | 75,458
3 Satisfactory | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 50,944 | 50,275 | 50,554
3 Satisfactory | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,389 | 1,983 | 1,042
3 Satisfactory | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 29,253 | 24,232 | 22,174
3 Satisfactory | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,485 | 1,635 | 1,688
4 Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 200,239 | 176,959 | 167,933
4 Average | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 127,903 | 108,719 | 108,835
4 Average | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 16,711 | 23,345 | 19,445
4 Average | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 55,625 | 44,895 | 39,653
4 Average | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
5 Watch |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 59,419 | 56,712 | 52,083
5 Watch | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 36,213 | 36,974 | 32,963
5 Watch | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 3,749 | 1,567 | 1,946
5 Watch | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 19,457 | 18,171 | 17,174
5 Watch | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
6 OAEM |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 10,313 | 14,335 | 18,344
6 OAEM | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 8,477 | 9,846 | 13,578
6 OAEM | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 2,519 | 2,555
6 OAEM | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,836 | 1,970 | 2,211
6 OAEM | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
7 Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 22,417 | 32,287 | 35,497
7 Substandard | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 18,315 | 23,817 | 25,827
7 Substandard | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 717 | 747 | 777
7 Substandard | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 3,385 | 7,723 | 8,893
7 Substandard | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
8 Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 519
8 Doubtful | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 519
8 Doubtful | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
8 Doubtful | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0 | 0 | 0
8 Doubtful | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 0 | $ 0 | $ 0

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