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Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Allowance for loan losses $ 72,965 $ 72,505 $ 69,500 $ 65,200
Allowance for loans individually evaluated for impairment 0 25    
Allowance for loans collectively evaluated for impairment 72,965 72,480    
Ending balance of loans 7,136,098 6,887,709    
Commercial Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Allowance for loan losses 34,525 32,759 27,606 25,444
Allowance for loans individually evaluated for impairment 0 25    
Allowance for loans collectively evaluated for impairment 34,525 32,734    
Ending balance of loans 3,444,266 3,222,310    
Consumer Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Allowance for loan losses 35,647 37,178 36,830 33,375
Allowance for loans individually evaluated for impairment 0 0    
Allowance for loans collectively evaluated for impairment 35,647 37,178    
Ending balance of loans 2,246,676 2,284,563    
Residential Real Estate [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Allowance for loan losses 2,793 2,568 $ 5,064 $ 6,381
Allowance for loans individually evaluated for impairment 0 0    
Allowance for loans collectively evaluated for impairment 2,793 2,568    
Ending balance of loans 1,445,156 1,380,836    
Originated Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 6,871,220 6,565,118    
Ending balance of loans individually evaluated for impairment 18,253 20,578    
Ending balance of loans collectively evaluated for impairment 6,852,967 6,544,540    
Originated Loans [Member] | Commercial Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 3,329,000 3,078,620    
Ending balance of loans individually evaluated for impairment 3,488 5,786    
Ending balance of loans collectively evaluated for impairment 3,325,512 3,072,834    
Originated Loans [Member] | Consumer Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 2,222,943 2,252,939    
Ending balance of loans individually evaluated for impairment 7,044 7,887    
Ending balance of loans collectively evaluated for impairment 2,215,899 2,245,052    
Originated Loans [Member] | Residential Real Estate [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 1,319,277 1,233,559    
Ending balance of loans individually evaluated for impairment 7,721 6,905    
Ending balance of loans collectively evaluated for impairment 1,311,556 1,226,654    
Acquired Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Allowance for loan losses 0 0    
Ending balance of loans 264,878 322,591    
Ending balance of loans collectively evaluated for impairment 264,878 322,591    
Acquired Loans [Member] | Commercial Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 115,266 143,690    
Ending balance of loans collectively evaluated for impairment 115,266 143,690    
Acquired Loans [Member] | Consumer Loans [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 23,733 31,624    
Ending balance of loans collectively evaluated for impairment 23,733 31,624    
Acquired Loans [Member] | Residential Real Estate [Member]        
Allowance for loan losses and recorded investment by portfolio segment [Abstract]        
Ending balance of loans 125,879 147,277    
Ending balance of loans collectively evaluated for impairment $ 125,879 $ 147,277