Derivative Financial Instruments and Hedging Activities (Details) - Offsetting Derivatives - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Offsetting Derivative Assets [Abstract]
Gross amounts recognized		$ 11,341	$ 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]	11,341	9,018
Offsetting derivative positions		(3,752)	(1,195)
Cash collateral pledged		0	0
Derivative Asset, Net credit exposure		7,589	7,823
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		16,691	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]	16,691	11,980
Offsetting derivative positions		(3,752)	(1,195)
Cash collateral pledged		(12,939)	(10,785)
Derivative Liability, Net credit exposure		$ 0	$ 0

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