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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net unrealized gains on securities available for sale    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance $ 2,209 $ 16,924
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 1,707 (4,326)
Reclassification Out Of Accumulated Other Comprehensive Income (66) 2,491
Other Comprehensive Income (Loss) Other Net Of Tax 1,641 (1,835)
Ending balance 3,850 15,089
Net unrealized loss on cash flow hedges    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance (613) (2,927)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (38) (1,457)
Reclassification Out Of Accumulated Other Comprehensive Income 149 1,579
Other Comprehensive Income (Loss) Other Net Of Tax 111 122
Ending balance (502) (2,805)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income [Line Items]    
Beginning balance 1,596 13,997
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 1,669 (5,783)
Reclassification Out Of Accumulated Other Comprehensive Income 83 4,070
Other Comprehensive Income (Loss) Other Net Of Tax 1,752 (1,713)
Ending balance $ 3,348 $ 12,284