Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Offsetting Liabilities
Gross Amounts of Recognized Liabilities	$ 140,863	$ 138,012
Gross Amounts Offset in the Statement of Financial Condition	157	367
Net Amounts Offset in the Statement of Financial Condition	140,706	137,645
Gross Amounts Not Offset in the Statement of Financial Condition
Financial Instruments	130,662	128,343
Cash Collateral Pledge	9,833	9,018
Net Amount	211	284
Interest rate swap contracts
Offsetting Liabilities
Gross Amounts of Recognized Liabilities	10,201	9,669
Gross Amounts Offset in the Statement of Financial Condition	157	367
Net Amounts Offset in the Statement of Financial Condition	10,044	9,302
Gross Amounts Not Offset in the Statement of Financial Condition
Cash Collateral Pledge	9,833	9,018
Net Amount	211	284
Repurchase agreements
Offsetting Liabilities
Gross Amounts of Recognized Liabilities	130,662	128,343
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts Offset in the Statement of Financial Condition	130,662	128,343
Gross Amounts Not Offset in the Statement of Financial Condition
Financial Instruments	130,662	128,343
Net Amount	$ 0	$ 0