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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Risk Management  
Derivative [Line Items]  
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments
The notional amount of the derivative instruments used to manage risk was $3.5 million at December 31, 2016.
Client-Related  
Derivative [Line Items]  
Schedule of Notional Amounts and Fair Values of Derivative Instruments and Client-Related Derivative Instruments
The table below summarizes the notional amounts and fair values of the client-related derivative instruments.
 
 
Asset Derivatives
(Other Assets)
 
Liability Derivatives
(Other Liabilities)
 
Notional Amount
 
Fair Value
 
Fair Value
(in thousands)
December 31,
2017
 
December 31,
2016
 
December 31,
2017
 
December 31,
2016
 
December 31,
2017
 
December 31,
2016
Non-designated hedging instruments
 
 
 
 
 
 
 
 
 
 
 
Interest rate swap contracts
$
394,852

 
$
124,322

 
$
2,061

 
$
982

 
$
2,061

 
$
982

Foreign exchange forward contracts
1,528

 
3,034

 
1,528

 
3,034

 
1,528

 
3,034