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Commitments and Contingent Liabilities (Schedule of Commitments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Supply Commitment [Line Items]    
Contractual Obligation $ 129,375 $ 122,348
Loan Origination Commitments [Member]    
Supply Commitment [Line Items]    
Contractual Obligation 126,742 120,786
Commitments to Extend Credit [Member]    
Supply Commitment [Line Items]    
Contractual Obligation $ 2,633 $ 1,562