Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	$ 153,813	$ 169,716
Gross Amounts Offset in the Statement of Financial Position	27	60
Net Amounts of Liabilities Presented in the Statement of Financial Position	153,786	169,656
Gross amounts Not Offset in the Statement of Financial Position
Financial Instruments	148,001	162,913
Cash Collateral Pledged	5,206	3,794
Net Amount	579	2,949
Interest rate swaps
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	5,812	6,803
Gross Amounts Offset in the Statement of Financial Position	27	60
Net Amounts of Liabilities Presented in the Statement of Financial Position	5,785	6,743
Gross amounts Not Offset in the Statement of Financial Position
Cash Collateral Pledged	5,206	3,794
Net Amount	579	2,949
Repurchase agreements
Offsetting of financial liabilities and derivative liabilities
Gross Amounts of Recognized Liabilities	148,001	162,913
Net Amounts of Liabilities Presented in the Statement of Financial Position	148,001	162,913
Gross amounts Not Offset in the Statement of Financial Position
Financial Instruments	$ 148,001	$ 162,913