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Troubled Debt Restructurings (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
contract
Jun. 30, 2018
USD ($)
contract
Jun. 30, 2017
contract
Dec. 31, 2017
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
Number of troubled debt restructured loans   20   21
Loan is considered payment default   30 days    
Financing Receivable, Modifications, Nonaccrual, Number of Contracts 2 2   1
Financing Receivable, Modifications, Nonaccrual, Recorded Investment | $ $ 125 $ 125   $ 44
Troubled Debt Restructuring Modifications Number Of Contracts 1 1 0  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   0    
Total troubled debt restructured loans | $ $ 4,300 $ 4,300   $ 4,400