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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income [Line Items]      
Other-than-temporary impairment losses on investment securities $ 0 $ 4,662 $ 0
Net unrealized gains on securities available for sale      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance 16,924 25,765 11,433
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (14,454) (3,250) 14,207
Other-than-temporary impairment losses on investment securities   4,662  
Reclassification Out Of Accumulated Other Comprehensive Income (261) (929) 125
Other Comprehensive Income (Loss) Other Net Of Tax (14,715) (8,841) 14,332
Ending balance 2,209 16,924 25,765
Net unrealized loss on cash flow hedges      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance (2,927) (6,054) (8,242)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (1,628) (3,019) (5,157)
Other-than-temporary impairment losses on investment securities   0  
Reclassification Out Of Accumulated Other Comprehensive Income 3,942 6,146 7,345
Other Comprehensive Income (Loss) Other Net Of Tax 2,314 3,127 2,188
Ending balance (613) (2,927) (6,054)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income [Line Items]      
Beginning balance 13,997 19,711 3,191
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (16,082) (6,269) 9,050
Other-than-temporary impairment losses on investment securities   4,662  
Reclassification Out Of Accumulated Other Comprehensive Income 3,681 5,217 7,470
Other Comprehensive Income (Loss) Other Net Of Tax (12,401) (5,714) 16,520
Ending balance $ 1,596 $ 13,997 $ 19,711