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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
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses $ 72,165 $ 71,405 $ 72,505 $ 72,450 $ 70,200 $ 69,500
Allowance for loans individually evaluated for impairment 11   25      
Allowance for loans collectively evaluated for impairment 72,154   72,480      
Ending balance of loans 6,963,273   6,887,709      
Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 33,152 32,159 32,759 31,059 28,190 27,606
Allowance for loans individually evaluated for impairment 11   25      
Allowance for loans collectively evaluated for impairment 33,141   32,734      
Ending balance of loans 3,325,064   3,222,310      
Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 36,534 36,804 37,178 36,479 36,973 36,830
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 36,534   37,178      
Ending balance of loans 2,234,130   2,284,563      
Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 2,479 $ 2,442 2,568 $ 4,912 $ 5,037 $ 5,064
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 2,479   2,568      
Ending balance of loans 1,404,079   1,380,836      
Originated Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 6,658,359   6,565,118      
Ending balance of loans individually evaluated for impairment 20,591   20,578      
Ending balance of loans collectively evaluated for impairment 6,637,768   6,544,540      
Originated Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 3,185,354   3,078,620      
Ending balance of loans individually evaluated for impairment 5,422   5,786      
Ending balance of loans collectively evaluated for impairment 3,179,932   3,072,834      
Originated Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 2,206,548   2,252,939      
Ending balance of loans individually evaluated for impairment 7,674   7,887      
Ending balance of loans collectively evaluated for impairment 2,198,874   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 1,266,457   1,233,559      
Ending balance of loans individually evaluated for impairment 7,495   6,905      
Ending balance of loans collectively evaluated for impairment 1,258,962   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 304,914   322,591      
Ending balance of loans collectively evaluated for impairment 304,914   322,591      
Acquired Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 139,710   143,690      
Ending balance of loans collectively evaluated for impairment 139,710   143,690      
Acquired Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 27,582   31,624      
Ending balance of loans collectively evaluated for impairment 27,582   31,624      
Acquired Loans [Member] | Residential Real Estate [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 137,622   147,277      
Ending balance of loans collectively evaluated for impairment $ 137,622   $ 147,277