Stockholders Equity (Categories of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			$ 57,480	$ 83,976
Other comprehensive income	(10,861)	(9,125)	5,947	(31,037)
Other comprehensive income, Ending Balance	63,427	52,939	63,427	52,939
Unrealized Gains on Investment Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			68,753	113,599
Other comprehensive income			5,825	(44,035)
Other comprehensive income, Ending Balance	74,578	69,564	74,578	69,564
Unrealized Losses on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other comprehensive income, Beginning Balance			(11,273)	(29,623)
Other comprehensive income			122	12,998
Other comprehensive income, Ending Balance	$ (11,151)	$ (16,625)	$ (11,151)	$ (16,625)