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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

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