Derivatives (Offsetting Derivatives Assets) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Interest Rate Swap [Member]
Derivative Assets
Derivative Assets, Gross Amounts of Recognized Assets	$ 37,487	$ 26,327
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	37,487	26,327
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position, Financial Instruments	0	(131)
Derivative Assets, Gross Amounts Not Offset in the Statement of Financial Position, Collateral Posted	0	0
Derivative Assets, Net Amount	$ 37,487	$ 26,196