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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
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses $ 72,805 $ 72,450 $ 69,500 $ 68,350 $ 66,600 $ 65,200
Allowance for loans individually evaluated for impairment 25   57      
Allowance for loans collectively evaluated for impairment 72,780   69,443      
Ending balance of loans 6,887,262   6,583,639      
Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 31,732 31,059 27,606 25,554 24,428 25,444
Allowance for loans individually evaluated for impairment 25   57      
Allowance for loans collectively evaluated for impairment 31,707   27,549      
Ending balance of loans 3,212,577   3,028,269      
Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 37,307 36,479 36,830 36,187 35,523 33,375
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 37,307   36,830      
Ending balance of loans 2,301,198   2,234,349      
Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 3,766 $ 4,912 5,064 $ 6,609 $ 6,649 $ 6,381
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 3,766   5,064      
Ending balance of loans 1,373,487   1,321,021      
Originated Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 6,546,387   6,181,948      
Ending balance of loans individually evaluated for impairment 19,282   21,138      
Ending balance of loans collectively evaluated for impairment 6,527,105   6,160,810      
Originated Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 3,058,769   2,840,956      
Ending balance of loans individually evaluated for impairment 5,077   5,876      
Ending balance of loans collectively evaluated for impairment 3,053,692   2,835,080      
Originated Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 2,267,204   2,190,443      
Ending balance of loans individually evaluated for impairment 7,760   8,432      
Ending balance of loans collectively evaluated for impairment 2,259,444   2,182,011      
Originated Loans [Member] | Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 1,220,414   1,150,549      
Ending balance of loans individually evaluated for impairment 6,445   6,830      
Ending balance of loans collectively evaluated for impairment 1,213,969   1,143,719      
Acquired Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 0   0      
Ending balance of loans 340,875   401,691      
Ending balance of loans collectively evaluated for impairment 340,875   401,691      
Acquired Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 153,808   187,313      
Ending balance of loans collectively evaluated for impairment 153,808   187,313      
Acquired Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 33,994   43,906      
Ending balance of loans collectively evaluated for impairment 33,994   43,906      
Acquired Loans [Member] | Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 153,073   170,472      
Ending balance of loans collectively evaluated for impairment $ 153,073   $ 170,472