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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, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses $ 72,365 $ 72,165 $ 72,505 $ 72,805 $ 72,450 $ 69,500
Allowance for loans individually evaluated for impairment 0   25      
Allowance for loans collectively evaluated for impairment 72,365   72,480      
Ending balance of loans 7,013,809   6,887,709      
Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 33,440 33,152 32,759 31,732 31,059 27,606
Allowance for loans individually evaluated for impairment 0   25      
Allowance for loans collectively evaluated for impairment 33,440   32,734      
Ending balance of loans 3,351,201   3,222,310      
Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 36,335 36,534 37,178 37,307 36,479 36,830
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 36,335   37,178      
Ending balance of loans 2,245,688   2,284,563      
Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 2,590 $ 2,479 2,568 $ 3,766 $ 4,912 $ 5,064
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 2,590   2,568      
Ending balance of loans 1,416,920   1,380,836      
Originated Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 6,724,120   6,565,118      
Ending balance of loans individually evaluated for impairment 18,057   20,578      
Ending balance of loans collectively evaluated for impairment 6,706,063   6,544,540      
Originated Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 3,218,390   3,078,620      
Ending balance of loans individually evaluated for impairment 3,117   5,786      
Ending balance of loans collectively evaluated for impairment 3,215,273   3,072,834      
Originated Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 2,220,267   2,252,939      
Ending balance of loans individually evaluated for impairment 7,267   7,887      
Ending balance of loans collectively evaluated for impairment 2,213,000   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 1,285,463   1,233,559      
Ending balance of loans individually evaluated for impairment 7,673   6,905      
Ending balance of loans collectively evaluated for impairment 1,277,790   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 289,689   322,591      
Ending balance of loans collectively evaluated for impairment 289,689   322,591      
Acquired Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 132,811   143,690      
Ending balance of loans collectively evaluated for impairment 132,811   143,690      
Acquired Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 25,421   31,624      
Ending balance of loans collectively evaluated for impairment 25,421   31,624      
Acquired Loans [Member] | Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 131,457   147,277      
Ending balance of loans collectively evaluated for impairment $ 131,457   $ 147,277