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Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Net Loans $ 5,883,133 $ 5,595,271
Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,159,089 1,144,761
Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 528,442 569,595
Commercial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,589,707 2,479,745
Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,096,646 1,999,811
Residential Real Estate Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,196,780 1,115,715
Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 5,271,619 4,847,937
Originated Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,303,978 2,140,371
Originated Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,903,057 1,741,936
Originated Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,810,122 1,648,664
Originated Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 32,053 23,680
Originated Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 60,874 69,584
Originated Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 8 8
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 644,318 615,147
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 604,405 570,884
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 9,726 6,022
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 30,187 38,241
Originated Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,194,897 1,068,868
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,144,832 1,023,856
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 21,587 17,341
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 28,478 27,671
Originated Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 34,624 32,947
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 33,565 30,481
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 311 275
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 740 2,183
Originated Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 8 8
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 29,218 24,974
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 27,320 23,443
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 429 42
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,469 1,489
Originated Loans [Member] | Commercial Loans [Member] | Agricultural Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 400,921 398,435
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 386,397 379,445
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 14,524 18,990
Originated Loans [Member] | Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,001,219 1,858,724
Originated Loans [Member] | Consumer Loans [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,991,910 1,847,216
Originated Loans [Member] | Consumer Loans [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 9,309 11,508
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,477,250 1,310,050
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 1,473,193 1,306,095
Originated Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 4,057 3,955
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 464,715 492,880
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 459,540 485,463
Originated Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 5,175 7,417
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 59,254 55,794
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 59,177 55,658
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 77 136
Originated Loans [Member] | Residential Real Estate Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 966,422 848,842
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 958,013 838,816
Originated Loans [Member] | Residential Real Estate Mortgages [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 8,409 10,026
Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 611,514 747,334
Acquired Loans [Member] | Commercial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 285,729 333,331
Acquired Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 235,934 275,152
Acquired Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 222,112 249,666
Acquired Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,976 5,486
Acquired Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 10,846 20,000
Acquired Loans [Member] | Commercial Loans [Member] | Total Commercial and Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 68,991 75,264
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 67,241 63,630
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 802 2,840
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 948 8,794
Acquired Loans [Member] | Commercial Loans [Member] | Commercial [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 166,943 199,888
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 154,871 186,036
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 2,174 2,646
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 9,898 11,206
Acquired Loans [Member] | Commercial Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 0 0
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 49,795 58,179
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 46,032 53,264
Acquired Loans [Member] | Commercial Loans [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 3,763 4,915
Acquired Loans [Member] | Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 95,427 147,256
Acquired Loans [Member] | Consumer Loans [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 94,822 146,494
Acquired Loans [Member] | Consumer Loans [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 605 762
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 27,775 65,223
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 27,670 65,063
Acquired Loans [Member] | Consumer Loans [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 105 160
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 63,727 76,716
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 63,270 76,154
Acquired Loans [Member] | Consumer Loans [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 457 562
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 3,925 5,317
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 3,882 5,277
Acquired Loans [Member] | Consumer Loans [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 43 40
Acquired Loans [Member] | Residential Real Estate Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 230,358 266,747
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans 227,448 262,883
Acquired Loans [Member] | Residential Real Estate Mortgages [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net Loans $ 2,910 $ 3,864