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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | $ 505,737 | $ 442,435
Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 302,506 | 269,462
Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 25,406 | 24,881
Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 150,769 | 128,341
Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 27,056 | 19,751
1 Strong |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 852 | 1,262
1 Strong | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 2 | 6
1 Strong | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
1 Strong | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 850 | 1,256
1 Strong | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
2 Above average |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 48,491 | 55,059
2 Above average | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 13,981 | 29,176
2 Above average | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 49 | 56
2 Above average | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 8,934 | 7,506
2 Above average | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 25,527 | 18,321
3 Satisfactory |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 132,372 | 85,095
3 Satisfactory | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 81,286 | 52,821
3 Satisfactory | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 1,345 | 2,057
3 Satisfactory | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 48,212 | 28,787
3 Satisfactory | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 1,529 | 1,430
4 Average |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 221,073 | 207,442
4 Average | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 139,421 | 122,071
4 Average | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 16,506 | 18,070
4 Average | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 65,146 | 67,301
4 Average | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
5 Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 67,394 | 58,700
5 Watch | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 43,181 | 36,075
5 Watch | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 7,349 | 4,490
5 Watch | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 16,864 | 18,135
5 Watch | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
6 OAEM |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 6,156 | 12,152
6 OAEM | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 4,569 | 9,742
6 OAEM | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
6 OAEM | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 1,587 | 2,410
6 OAEM | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 29,399 | 22,725
8 Doubtful | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 20,066 | 19,571
8 Doubtful | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 157 | 208
8 Doubtful | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 9,176 | 2,946
8 Doubtful | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
8 Doubtful | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | $ 0 | $ 0

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