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Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | $ 628,066 | $ 576,784
Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 353,243 | 323,809
Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 27,304 | 38,056
Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 196,391 | 181,528
Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 51,128 | 33,391
1 Strong |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 3,444 | 1,586
1 Strong | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 0 | 0
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 | 3,444 | 1,586
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 | 63,885 | 51,023
2 Above average | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 10,484 | 12,534
2 Above average | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 37 | 40
2 Above average | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 4,564 | 5,776
2 Above average | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 48,800 | 32,673
3 Satisfactory |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 129,105 | 115,624
3 Satisfactory | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 80,266 | 73,899
3 Satisfactory | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 2,231 | 2,856
3 Satisfactory | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 46,090 | 38,151
3 Satisfactory | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 518 | 718
4 Average |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 275,268 | 280,762
4 Average | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 172,597 | 173,956
4 Average | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 18,780 | 22,446
4 Average | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 82,081 | 84,360
4 Average | Municipal |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 1,810 | 0
5 Watch |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 117,841 | 88,300
5 Watch | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 66,325 | 41,652
5 Watch | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 5,970 | 12,714
5 Watch | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 45,546 | 33,934
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 | 8,695 | 6,207
6 OAEM | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 6,890 | 3,442
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 | 1,805 | 2,765
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 | 29,705 | 33,159
8 Doubtful | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 16,558 | 18,203
8 Doubtful | Commercial | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 286 | 0
8 Doubtful | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 12,861 | 14,956
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 | 123 | 123
8 Doubtful | Commercial | Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Risk rated loans receivable | 123 | 123
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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