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Allowance for Loan Losses and Credit Quality of Loans, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance, beginning of period $ 64,959 $ 69,534 $ 66,359 $ 69,434    
Charge-offs (6,374) (5,977) (17,422) (16,047)    
Recoveries 1,308 892 3,416 3,300    
Provision 4,966 4,885 12,506 12,647    
Balance, end of period 64,859 69,334 64,859 69,334    
Allowance for loan losses for acquired loan portfolio     1,900 3,000    
Provision expense and net charge-offs related to acquired loans 500 300 1,200 500    
Allowance loan losses [Abstract]            
Allowance for loan losses 64,959 69,534 66,359 69,434 $ 64,859 $ 66,359
Allowance for loans individually evaluated for impairment         3,545 1,100
Allowance for loans collectively evaluated for impairment         61,314 65,259
Ending balance of loans         5,870,988 5,595,271
Commercial Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance, beginning of period 28,326 35,123 32,433 35,090    
Charge-offs (1,333) (1,517) (2,715) (3,423)    
Recoveries 258 253 772 966    
Provision (2,800) 1,779 (6,039) 3,005    
Balance, end of period 24,451 35,638 24,451 35,638    
Allowance loan losses [Abstract]            
Allowance for loan losses 28,326 35,123 32,433 35,090 24,451 32,433
Allowance for loans individually evaluated for impairment         3,545 1,100
Allowance for loans collectively evaluated for impairment         20,906 31,333
Ending balance of loans         2,602,385 2,473,702
Consumer Loans [Member]            
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance, beginning of period 28,314 27,973 26,720 27,694    
Charge-offs (4,530) (3,979) (13,183) (11,659)    
Recoveries 889 632 2,334 2,087    
Provision 7,333 2,826 16,135 9,330    
Balance, end of period 32,006 27,452 32,006 27,452    
Allowance loan losses [Abstract]            
Allowance for loan losses 28,314 27,973 26,720 27,694 32,006 26,720
Allowance for loans individually evaluated for impairment         0 0
Allowance for loans collectively evaluated for impairment         32,006 26,720
Ending balance of loans         2,091,408 2,005,980
Residential Real Estate Mortgages [Member]            
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance, beginning of period 8,281 6,205 7,130 6,520    
Charge-offs (511) (481) (1,524) (965)    
Recoveries 161 7 310 247    
Provision 51 212 2,066 141    
Balance, end of period 7,982 5,943 7,982 5,943    
Allowance loan losses [Abstract]            
Allowance for loan losses 8,281 6,205 7,130 6,520 7,982 7,130
Allowance for loans individually evaluated for impairment         0 0
Allowance for loans collectively evaluated for impairment         7,982 7,130
Ending balance of loans         1,177,195 1,115,589
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Roll Forward]            
Balance, beginning of period 38 233 76 130    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision 382 68 344 171    
Balance, end of period 420 301 420 301    
Allowance loan losses [Abstract]            
Allowance for loan losses $ 38 $ 233 $ 76 $ 130 420 76
Allowance for loans collectively evaluated for impairment         420 76
Originated Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         5,217,167 4,847,937
Ending balance of loans individually evaluated for impairment         26,016 20,121
Ending balance of loans collectively evaluated for impairment         5,191,151 4,827,816
Originated Loans [Member] | Commercial Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         2,297,178 2,140,371
Ending balance of loans individually evaluated for impairment         12,559 11,079
Ending balance of loans collectively evaluated for impairment         2,284,619 2,129,292
Originated Loans [Member] | Consumer Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         1,984,440 1,858,724
Ending balance of loans individually evaluated for impairment         7,590 5,498
Ending balance of loans collectively evaluated for impairment         1,976,850 1,853,226
Originated Loans [Member] | Residential Real Estate Mortgages [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         935,549 848,842
Ending balance of loans individually evaluated for impairment         5,867 3,544
Ending balance of loans collectively evaluated for impairment         929,682 845,298
Acquired Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         653,821 747,334
Ending balance of loans individually evaluated for impairment         9,317 5,675
Ending balance of loans collectively evaluated for impairment         644,504 741,659
Acquired Loans [Member] | Commercial Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         305,207 333,331
Ending balance of loans individually evaluated for impairment         9,317 5,675
Ending balance of loans collectively evaluated for impairment         295,890 327,656
Acquired Loans [Member] | Consumer Loans [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         106,968 147,256
Ending balance of loans individually evaluated for impairment         0 0
Ending balance of loans collectively evaluated for impairment         106,968 147,256
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]            
Allowance loan losses [Abstract]            
Ending balance of loans         241,646 266,747
Ending balance of loans individually evaluated for impairment         0 0
Ending balance of loans collectively evaluated for impairment         $ 241,646 $ 266,747