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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, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses $ 65,668 $ 64,568 $ 63,018 $ 64,859 $ 64,959 $ 66,359
Allowance for loans individually evaluated for impairment 3,372   2,005      
Allowance for loans collectively evaluated for impairment 62,296   61,013      
Ending balance of loans 6,160,185   5,883,133      
Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 26,611 25,222 25,545 24,451 28,326 32,433
Allowance for loans individually evaluated for impairment 3,372   2,005      
Allowance for loans collectively evaluated for impairment 23,239   23,540      
Ending balance of loans 2,781,143   2,589,707      
Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 32,401 31,471 29,253 32,006 28,314 26,720
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 32,401   29,253      
Ending balance of loans 2,138,705   2,096,646      
Residential Real Estate Mortgages [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 6,379 7,875 7,960 7,982 8,281 7,130
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 6,379   7,960      
Ending balance of loans 1,240,337   1,196,780      
Unallocated [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Allowance for loan losses 277 $ 0 260 $ 420 $ 38 $ 76
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 277   260      
Originated Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 5,630,104   5,271,619      
Ending balance of loans individually evaluated for impairment 36,184   25,963      
Ending balance of loans collectively evaluated for impairment 5,593,920   5,245,656      
Originated Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 2,527,524   2,303,978      
Ending balance of loans individually evaluated for impairment 21,594   12,253      
Ending balance of loans collectively evaluated for impairment 2,505,930   2,291,725      
Originated Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 2,069,532   2,001,219      
Ending balance of loans individually evaluated for impairment 8,502   7,693      
Ending balance of loans collectively evaluated for impairment 2,061,030   1,993,526      
Originated Loans [Member] | Residential Real Estate Mortgages [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 1,033,048   966,422      
Ending balance of loans individually evaluated for impairment 6,088   6,017      
Ending balance of loans collectively evaluated for impairment 1,026,960   960,405      
Acquired Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 530,081   611,514      
Ending balance of loans individually evaluated for impairment 1,205   1,205      
Ending balance of loans collectively evaluated for impairment 528,876   610,309      
Acquired Loans [Member] | Commercial Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 253,619   285,729      
Ending balance of loans individually evaluated for impairment 1,205   1,205      
Ending balance of loans collectively evaluated for impairment 252,414   284,524      
Acquired Loans [Member] | Consumer Loans [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 69,173   95,427      
Ending balance of loans individually evaluated for impairment 0   0      
Ending balance of loans collectively evaluated for impairment 69,173   95,427      
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]            
Allowance for loan losses and recorded investment by portfolio segment [Abstract]            
Ending balance of loans 207,289   230,358      
Ending balance of loans individually evaluated for impairment 0   0      
Ending balance of loans collectively evaluated for impairment $ 207,289   $ 230,358