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Loans (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
loan
contract
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 1,050 $ 1,430  
Loans, related parties 3,500 3,500  
Loans, related parties, new borrowings 1,700    
Loans, related parties, repayments and other reductions 1,700    
Past due greater than 90 days and still accruing interest 0 0  
Past Due Loans 5,893 4,878  
Estimated interest income $ 234 $ 432 $ 527
Number of Contracts | contract 4 3  
Pre-Modification Outstanding Recorded Investment $ 1,076 $ 2,024  
Number of TDR loans in default | loan   2  
TDRs in default, amount   $ 1,300  
Days past due when loans are generally placed on nonaccrual status, in days 90 days 90 days  
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due Loans $ 1,326 $ 1,118  
Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due Loans $ 1,337 $ 933  
Number of Contracts | contract 3 2  
Pre-Modification Outstanding Recorded Investment $ 526 $ 1,342  
Greater than 90 Days [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due Loans 9 8  
Greater than 90 Days [Member] | Consumer Overdrafts [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due Loans $ 9 $ 8