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Derivative Instruments and Hedging Activities (Tables)
12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities [Abstract]  
Fair Values of Derivative Instruments on the Balance Sheet
        Asset derivatives Liability derivatives
  Gross notional amount Balance Fair value Balance Fair value
        sheet         sheet        
    2017 2016 line item 2017  2016  line item 2017  2016 
 
Derivatives not                          
designated as                          
hedging instruments                          
        Other         Other        
Credit contracts $ 12,282 $ - assets $ - $ - liabilities $ 4 $ -
Total derivatives $ 12,282 $ - $ - $ -   $ 4 $ -
Effect of Derivative Instruments on the Income Statement
    Gain (loss) recognized in income
  Line item of gain (loss)            
Undesignated derivatives recognized in income   2017   2016   2015 
 
Credit contract Noninterest income - Other $ 131 $ - $ -
Total undesignated   $ 131 $ - $ -