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Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) loan | Mar. 31, 2016 USD ($) loan | Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 70 | 82 | 71
Balance | $ 21,121 | $ 23,628 | $ 21,526
Specific Reserves | $ 386 | $ 436 | $ 736
Commercial | Real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 10 | 14 | 10
Balance | $ 8,703 | $ 10,133 | $ 8,937
Specific Reserves | $ 82 | $ 65 | $ 375
Commercial | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 1 | 1 | 1
Balance | $ 763 | $ 788 | $ 763
Specific Reserves | $ 101 | $ 96 | $ 100
Commercial | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 5 | 10 | 5
Balance | $ 772 | $ 1,116 | $ 779
Specific Reserves | $ 2 | $ 0 | $ 0
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0
Residential | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0
Residential | Term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 51 | 53 | 52
Balance | $ 10,344 | $ 10,856 | $ 10,503
Specific Reserves | $ 201 | $ 275 | $ 261
Home equity line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 3 | 4 | 3
Balance | $ 539 | $ 735 | $ 544
Specific Reserves | $ 0 | $ 0 | $ 0
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans (loan) | loan | 0 | 0 | 0
Balance | $ 0 | $ 0 | $ 0
Specific Reserves | $ 0 | $ 0 | $ 0

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