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Derivative Financial Instruments (Details 4) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Offsetting of financial liabilities and derivative liabilities    
Gross Amounts of Recognized Liabilities $ 153,802 $ 169,716
Gross Amounts Offset in the Statement of Financial Position 36 60
Net Amounts of Liabilities Presented in the Statement of Financial Position 153,766 169,656
Gross amounts Not Offset in the Statement of Financial Position    
Financial Instruments 148,109 162,913
Cash Collateral Pledged 4,939 3,794
Net Amount 718 2,949
Interest rate swaps    
Offsetting of financial liabilities and derivative liabilities    
Gross Amounts of Recognized Liabilities 5,693 6,803
Gross Amounts Offset in the Statement of Financial Position 36 60
Net Amounts of Liabilities Presented in the Statement of Financial Position 5,657 6,743
Gross amounts Not Offset in the Statement of Financial Position    
Cash Collateral Pledged 4,939 3,794
Net Amount 718 2,949
Repurchase agreements    
Offsetting of financial liabilities and derivative liabilities    
Gross Amounts of Recognized Liabilities 148,109 162,913
Net Amounts of Liabilities Presented in the Statement of Financial Position 148,109 162,913
Gross amounts Not Offset in the Statement of Financial Position    
Financial Instruments $ 148,109 $ 162,913