Balance Sheet Offsetting (Details) - Interest Rate Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 48	$ 558
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	48	558
Financial instruments	(48)	(558)
Collateral	0	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	44,210	34,087
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	44,210	34,087
Financial instruments	(48)	(558)
Collateral	(42,658)	(26,105)
Net amount	$ 1,504	$ 7,424