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Derivative Instruments and Hedging Activities (Tables)
3 Months Ended
Mar. 31, 2018
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
    Mar. 31, Dec. 31, sheet   Mar. 31, Dec. 31,  sheet   Mar. 31, Dec. 31,
    2018 2017 line item   2018  2017 line item   2018 2017
 
Derivatives                          
designated as                          
hedging instruments                          
          Other         Other      
Cash flow hedges $ 100,000 $ - assets $ 899 $ - liabilities $ - $ -
Total derivatives $ 100,000 $ -   $ 899 $ -   $ - $ -
 
Derivatives not                          
designated as                          
hedging instruments                          
          Other         Other      
Credit contracts $ 34,880 $ 12,282 assets $ - $ - liabilities $ 21 $ 4
Total derivatives $ 34,880 $ 12,282   $ - $ -   $ 21 $ 4
Effect of Derivative Instruments on the Income Statement
      Gain (loss) recognized in income
      Three months ended
  Line item of gain (loss)   March 31,
Undesignated derivatives recognized in income   2018   2017
 
Credit contract Noninterest income - Other $ 174 $ -
Total undesignated   $ 174 $ -