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Fair Values (Schedule of Fair Value Measurement) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Assets and liabilities recorded at fair value    
Sellout period 2 years  
Recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Derivative assets   $ 0
Derivative liabilities   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
Derivative liabilities   47
Available-for-sale securities 0 0
Recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Derivative assets   0
Derivative liabilities   0
Available-for-sale securities 22,842 21,666
Recurring basis | Total    
Assets and liabilities recorded at fair value    
Derivative assets   727
Derivative liabilities   47
Available-for-sale securities 22,842 21,666
Non-recurring basis | Liquidation | Loans Receivable One    
Assets and liabilities recorded at fair value    
Impaired loans   5,200
Non-recurring basis | Comparable sales | Loans Receivable    
Assets and liabilities recorded at fair value    
Impaired loans   2,000
Non-recurring basis | Discounted cash flow | Loans Receivable    
Assets and liabilities recorded at fair value    
Impaired real estate   3,100
Non-recurring basis | Quoted market prices in active markets (Level 1)    
Assets and liabilities recorded at fair value    
Impaired loans   0
Impaired real estate 0 0
Impaired real estate available and held for sale 0  
Impaired land and development 0  
Non-recurring basis | Significant other observable inputs (Level 2)    
Assets and liabilities recorded at fair value    
Impaired loans   0
Impaired real estate 0 0
Impaired real estate available and held for sale 0  
Impaired land and development 0  
Non-recurring basis | Significant unobservable inputs (Level 3)    
Assets and liabilities recorded at fair value    
Impaired loans   7,200
Impaired real estate 12,400 3,063
Impaired real estate available and held for sale 800  
Impaired land and development 21,400  
Non-recurring basis | Total    
Assets and liabilities recorded at fair value    
Impaired loans   7,200
Impaired real estate 12,400 $ 3,063
Impaired real estate available and held for sale 800  
Impaired land and development $ 21,400  
Weighted average discount rate 11.00%  
Land and Land Development Assets | Non-recurring basis | Total    
Assets and liabilities recorded at fair value    
Weighted average discount rate 6.00%  
Estimated sales period 10 years