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Loans Receivable and Allowance for Loan Losses (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2018
USD ($)
loan
Jun. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 182,527,000   $ 182,527,000    
Non-accrual loans 10,763,000   10,763,000   $ 13,036,000
Recorded Investment, Subsequent Default $ 639,000 $ 1,358,000 $ 878,000 $ 1,780,000  
Number of Contracts, Subsequent Default | loan 1 2 2 3  
Transfers from non-accretable differences $ 0 $ 0 $ 0 $ 0  
Loss [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables 36,000   36,000    
Loss [Member] | Impaired Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables 36,000   36,000    
Substandard [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables 33,600,000   33,600,000    
Substandard [Member] | Impaired Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables 33,600,000   33,600,000    
Acquired loans with deteriorated credit [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 14,900,000   14,900,000    
Allowance for loans acquired     803,000    
Non-accrual loans $ 11,600,000   $ 11,600,000