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Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 USD ($) Contract | Jun. 30, 2017 USD ($) Contract | Dec. 31, 2016 USD ($) Contract | Dec. 31, 2013 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period for order of valuations (at least) |  | 18 months |  |
Number of loans moved to nonaccrual status | 2 |  |  |
Number of troubled debt restructured loan paid off |  | 1 | 1 |
Number of loans which has periodic late payments |  | 1 |  |
Number of loans classified as troubled debt restructured loans with active forbearance agreements |  | 2 |  |
Number of forbearance agreements negotiated |  |  |  | 1
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process | $ | $ 767 | $ 767 | $ 471 |
Residential mortgage and commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Threshold period past due to discontinue accrual interest on financing receivable |  | 90 days |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Threshold period past due for write-off of financing receivable (no later than) |  | 120 days |  |
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period of financing receivable, updated valuation on real estate secured loans, 90 days past due |  | 90 days |  |
Number of previous months with no updated valuation completed for corporation to update valuation |  | 12 months |  |
Impaired financing receivable, valuation on real estate collateralized loans |  | 30 days |  |
Residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, loan to value ratio of appraised value of property |  | 80.00% |  |
Entity Loan Modification Program |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from paid off troubled debt restructured loans | $ |  | $ 283 | $ 74 |
Maximum | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, term |  | 20 years |  |
Financing receivable, loan to value ratio of appraised value of property |  | 80.00% |  |
Maximum | Residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, term |  | 30 years |  |
Maximum | Home equity lines of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, term |  | 20 years |  |
Financing receivable, loan to value ratio of appraised value of property |  | 90.00% |  |

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