Balance Sheet Offsetting (Details) - Interest Rate Contract [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 823	$ 1,466
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	823	1,466
Financial instruments	(823)	(1,466)
Collateral	0	0
Net amount	0	0
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	48,700	30,200
Gross amounts offset in the balance sheet	0	0
Net amounts presented in the balance sheet	48,700	30,200
Financial instruments	(823)	(1,466)
Collateral	(47,877)	(28,734)
Net amount	$ 0	$ 0