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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 999,877 $ 945,107  
Ending Balance 1,045,478 999,877 $ 945,107
Accumulated Other Comprehensive Loss, Net Of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (10,963) (2,949) 1,596
Transfer of securities held to maturity to available-for-sale (12,041)    
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 11,893 (9,659) (11,749)
Reclassification Out Of Accumulated Other Comprehensive Income 10,103 1,645 (7,204)
Other Comprehensive Income (Loss) Other Net Of Tax 9,955 (8,014) (4,545)
Ending Balance (1,008) (10,963) (2,949)
Net unrealized gains on securities available for sale      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (10,972) (2,638) 2,209
Transfer of securities held to maturity to available-for-sale (12,041)    
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 14,335 (8,104) (11,563)
Reclassification Out Of Accumulated Other Comprehensive Income 8,237 (230) (6,716)
Other Comprehensive Income (Loss) Other Net Of Tax 10,531 (8,334) (4,847)
Ending Balance (441) (10,972) (2,638)
Net unrealized loss on cash flow hedges      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 9 (311) (613)
Transfer of securities held to maturity to available-for-sale 0    
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (2,442) (1,555) (186)
Reclassification Out Of Accumulated Other Comprehensive Income 1,866 1,875 (488)
Other Comprehensive Income (Loss) Other Net Of Tax (576) 320 302
Ending Balance $ (567) $ 9 $ (311)