Derivative Instruments-Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Offsetting Derivative Assets
Gross amounts recognized	$ 3,172	$ 2,818
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	3,172	2,818
Financial instruments	17	1,664
Financial collateral pledged	0	0
Net amounts	3,155	1,154
Offsetting Derivative Liabilities
Gross amounts recognized	4,747	3,315
Gross amounts offset in the consolidated balance sheets	0	0
Net amounts presented in the consolidated balance sheets	4,747	3,315
Financial instruments	17	1,664
Financial collateral pledged	2,838	0
Net amounts	$ 1,892	$ 1,651