Offsetting Assets and Liabilities Offsetting Assets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Derivative assets, fair value, gross asset	$ 5,237	$ 18,488
Derivative assets, fair value, gross liability	0	0
Derivative assets, fair value, amount not offset against collateral	5,237	18,488
Derivative assets, Collateral, Obligation to Return Securities	(1,039)	(193)
Derivative assets, Collateral, Obligation to Return Cash	(3,170)	(12,141)
Derivative assets, fair value, amount offset against collateral	$ 1,028	$ 6,154