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Accumulated Other Comprehensive Income (Changes in Other Comprehensive Income by Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 999,877  
Ending Balance 1,021,192 $ 946,849
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (10,963) (2,949)
Transfer of securities held-to-maturity to available-for-sale (12,041)  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 14,757 (9,550)
Reclassification Out Of Accumulated Other Comprehensive Income 200 314
Other Comprehensive Income (Loss) Other Net Of Tax 2,916 (9,236)
Ending Balance (8,047) (12,185)
Net unrealized gains on securities available for sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (10,972) (2,638)
Transfer of securities held-to-maturity to available-for-sale (12,041)  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 15,189 (9,576)
Reclassification Out Of Accumulated Other Comprehensive Income (17) (60)
Other Comprehensive Income (Loss) Other Net Of Tax 3,131 (9,636)
Ending Balance (7,841) (12,274)
Net unrealized loss on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 9 (311)
Transfer of securities held-to-maturity to available-for-sale 0  
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (432) 26
Reclassification Out Of Accumulated Other Comprehensive Income 217 374
Other Comprehensive Income (Loss) Other Net Of Tax (215) 400
Ending Balance $ (206) $ 89