Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net unrealized gains on securities available for sale
Changes in components of Accumulated Other comprehensive Income
Beginning balance	$ 11,433	$ 68,245	$ 79,244
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	12,352	(56,960)	(13,382)
Reclassification Out Of Accumulated Other Comprehensive Income	125	148	2,383
Other Comprehensive Income (Loss) Other Net Of Tax	12,477	(56,812)	(10,999)
Ending balance	23,910	11,433	68,245
Net unrealized loss on cash flow hedges
Changes in components of Accumulated Other comprehensive Income
Beginning balance	(8,242)	(12,365)	(42,113)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(3,302)	(1,930)	27,435
Reclassification Out Of Accumulated Other Comprehensive Income	7,345	6,053	2,313
Other Comprehensive Income (Loss) Other Net Of Tax	4,043	4,123	29,748
Ending balance	(4,199)	(8,242)	(12,365)
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in components of Accumulated Other comprehensive Income
Beginning balance	3,191	55,880	37,131
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	9,050	(58,890)	(6,622)
Reclassification Out Of Accumulated Other Comprehensive Income	7,470	6,201	4,696
Other Comprehensive Income (Loss) Other Net Of Tax	16,520	(52,689)	18,749
Ending balance	$ 19,711	$ 3,191	$ 55,880