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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income [Line Items]      
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income $ 4,662 $ 0 $ 0
Net unrealized gains on securities available for sale      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance 25,765 11,433 68,245
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (3,250) 14,207 (56,960)
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income (4,662)   0
Reclassification Out Of Accumulated Other Comprehensive Income (929) 125 148
Other Comprehensive Income (Loss) Other Net Of Tax (8,841) 14,332 (56,812)
Ending balance 16,924 25,765 11,433
Net unrealized loss on cash flow hedges      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance (6,054) (8,242) (12,365)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (3,019) (5,157) (1,930)
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income 0   0
Reclassification Out Of Accumulated Other Comprehensive Income 6,146 7,345 6,053
Other Comprehensive Income (Loss) Other Net Of Tax 3,127 2,188 4,123
Ending balance (2,927) (6,054) (8,242)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance 19,711 3,191 55,880
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (6,269) 9,050 (58,890)
Other-than-temporary impairment amount reclassified from accumulated other comprehensive income (4,662)   0
Reclassification Out Of Accumulated Other Comprehensive Income 5,217 7,470 6,201
Other Comprehensive Income (Loss) Other Net Of Tax (5,714) 16,520 (52,689)
Ending balance $ 13,997 $ 19,711 $ 3,191