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Fair Value of Financial Instruments (Assets Measured at Fair Value Nonrecurring) (Details) - Nonrecurring Basis
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Nonrecurring Basis    
Losses on impaired loans charged through allowance for loan losses $ 83,000 $ 408,000
Significant Other Observable Inputs (Level 2)    
Nonrecurring Basis    
Impaired loans, aggregate outstanding principal balance 33,000,000 33,000,000
Impaired loans, fair value $ 27,000,000 $ 27,000,000