Stockholders' Equity (Categories of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			$ 46,352	$ 57,480
Other comprehensive income	$ 1,706	$ 4,172	4,782	16,808
Other comprehensive income, Ending Balance	51,134	74,288	51,134	74,288
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			68,322	68,753
Other comprehensive income			(61)	21,211
Other comprehensive income, Ending Balance	68,261	89,964	68,261	89,964
Unrealized Losses on Derivative Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			(21,970)	(11,273)
Other comprehensive income			4,843	(4,403)
Other comprehensive income, Ending Balance	$ (17,127)	$ (15,676)	$ (17,127)	$ (15,676)