Derivatives (Offsetting Derivatives Assets) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Interest Rate Swap [Member]
Derivative Assets
Derivative Assets, Gross Amounts of Recognized Assets	$ 10,898	$ 22,213
Derivative Assets, Gross Amounts Offset in the Statement of Financial Position	0	0
Derivatives Assets, Net Amounts of Assets presented in the Statement of Financial Position	10,898	22,213
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	(2,303)	(16)
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position, Collateral Posted	0	0
Derivative Assets, Net Amount	$ 8,595	$ 22,197