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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%