Derivative Instruments and Hedging Activities(Details) - Offsetting Derivatives - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		$ 26,151	$ 9,018
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	26,151	9,018
Offsetting derivative positions		(12,788)	(1,195)
Cash collateral pledged		0	0
Derivative Asset, Net credit exposure		13,363	7,823
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		28,030	11,980
Less: amounts offset in the Consolidated Statements of Financial Condition		0	0
Net amount presented in the Consolidated Statements of Financial Condition	[1]	28,030	11,980
Offsetting derivative positions		(12,788)	(1,195)
Cash collateral pledged		(15,242)	(10,785)
Derivative Liability, Net credit exposure		$ 0	$ 0

[1] Included in other assets or other liabilities in the Consolidated Statements of Financial Condition.