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Borrowed Funds (Derivatives) (Details) - Cash Flow Hedging [Member] - Interest Rate Swaps [Member] - Designated as Hedging Instrument [Member] - London Interbank Offered Rate (LIBOR) [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Pay Rate 1.56% 1.56%
Remaining Life (Years) 2 years 7 months 3 years 4 months
Notional Amount $ 10,000 $ 10,000
Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Liability $ 451 $ 291