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Troubled Debt Restructurings (Schedule of Troubled Debt Restructurings on Financing Receivables) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
USD ($)
contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]      
Number of Contracts | contract 1 5 3
Pre-Modification Outstanding Recorded Investment $ 22 $ 1,296 $ 794
Post-Modification Outstanding Recorded Investment $ 22 $ 4 $ 794
Consumer Installment [Member]      
Troubled Debt Restructuring, Subsequent Periods [Line Items]      
Number of Contracts | contract 1    
Pre-Modification Outstanding Recorded Investment $ 22    
Post-Modification Outstanding Recorded Investment $ 22    
Commercial Real Estate Non-Owner Occupied [Member]      
Troubled Debt Restructuring, Subsequent Periods [Line Items]      
Number of Contracts | contract   1  
Pre-Modification Outstanding Recorded Investment   $ 736  
Post-Modification Outstanding Recorded Investment   $ 736  
Residential Single Family [Member]      
Troubled Debt Restructuring, Subsequent Periods [Line Items]      
Number of Contracts | contract   4 3
Pre-Modification Outstanding Recorded Investment   $ 560 $ 794
Post-Modification Outstanding Recorded Investment   $ 463 $ 794