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Fair Values (Schedule of Fair Value Measurement) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Derivative assets $ 0 $ 0
Derivative liabilities 0 0
Available-for-sale securities 0 0
Recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities recorded at fair value    
Derivative assets 727 76
Derivative liabilities 47 18
Recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Available-for-sale securities $ 21,666 $ 22,105
Non-recurring basis    
Assets and liabilities recorded at fair value    
Sellout period 2 years  
Non-recurring basis | Comparable Sales | Loans Receivable One    
Assets and liabilities recorded at fair value    
Impaired loans $ 5,200  
Number of impaired loans | loan   1
Non-recurring basis | Comparable Sales | Loans Receivable Two    
Assets and liabilities recorded at fair value    
Impaired loans $ 2,000  
Number of impaired loans | loan 1  
Non-recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Impaired loans $ 0  
Non-recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Impaired loans 7,200  
Impaired real estate $ 3,063  
Number of impaired loans | loan 1  
Fair Value | Recurring basis    
Assets and liabilities recorded at fair value    
Derivative assets $ 727 $ 76
Derivative liabilities 47 18
Available-for-sale securities 21,666 $ 22,105
Fair Value | Non-recurring basis    
Assets and liabilities recorded at fair value    
Impaired loans 7,200  
Impaired real estate $ 3,063  
Fair Value | Non-recurring basis | Discounted Cash Flow Valuation Technique    
Assets and liabilities recorded at fair value    
Discount rate 11.00%