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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Derivative Liability, Notional Amount   $ 3,500
Pledged cash as collateral in connection with interest rate swap agreements $ 1,400 700
Non-designated hedging instruments | Client-Related | Interest rate swap contracts    
Summary of Derivative Instruments [Abstract]    
Notional Amount 394,852 124,322
Non-designated hedging instruments | Client-Related | Foreign Exchange Forward [Member]    
Summary of Derivative Instruments [Abstract]    
Notional Amount 1,528 3,034
Non-designated hedging instruments | Client-Related | Other Assets | Interest rate swap contracts    
Derivative [Line Items]    
Unrealized Gain Derivative Instruments 2,061  
Summary of Derivative Instruments [Abstract]    
Derivative Asset, Fair Value, Gross Asset 2,061 982
Non-designated hedging instruments | Client-Related | Other Assets | Foreign Exchange Forward [Member]    
Summary of Derivative Instruments [Abstract]    
Derivative Asset, Fair Value, Gross Asset 1,528 3,034
Non-designated hedging instruments | Client-Related | Other Liabilities | Interest rate swap contracts    
Summary of Derivative Instruments [Abstract]    
Liability derivatives (other liabilities), fair value 2,061 982
Non-designated hedging instruments | Client-Related | Other Liabilities | Foreign Exchange Forward [Member]    
Summary of Derivative Instruments [Abstract]    
Liability derivatives (other liabilities), fair value $ 1,528 $ 3,034