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Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable $ 6,160,185 $ 5,883,133
Commercial Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,781,143 2,589,707
Consumer Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,138,705 2,096,646
Residential Mortgage Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,240,337 1,196,780
Originated Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 5,630,104 5,271,619
Originated Loans [Member] | Commercial Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,527,524 2,303,978
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,064,433 1,903,057
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,959,047 1,810,122
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 23,898 32,053
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 81,483 60,874
Originated Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 5 8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 679,753 644,318
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 631,244 604,405
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 9,307 9,726
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 39,202 30,187
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 0 0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,314,979 1,194,897
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,262,056 1,144,832
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 13,110 21,587
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 39,813 28,478
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 0 0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 37,305 34,624
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 36,493 33,565
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1 311
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 806 740
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 5 8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 32,396 29,218
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 29,254 27,320
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,480 429
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,662 1,469
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 0 0
Originated Loans [Member] | Commercial Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 463,091 400,921
Originated Loans [Member] | Business Banking Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 463,091 400,921
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 449,947 386,397
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 13,144 14,524
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 463,091 400,921
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 449,947 386,397
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 13,144 14,524
Originated Loans [Member] | Consumer Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,069,532 2,001,219
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,061,704 1,991,910
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 7,828 9,309
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,546,300 1,477,250
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,542,058 1,473,193
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,242 4,057
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 459,806 464,715
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 456,340 459,540
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,466 5,175
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 63,426 59,254
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 63,306 59,177
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 120 77
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,033,048 966,422
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,025,980 958,013
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 7,068 8,409
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,033,048 966,422
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,025,980 958,013
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 7,068 8,409
Acquired Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 530,081 611,514
Acquired Loans [Member] | Commercial Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 253,619 285,729
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 202,337 235,934
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 189,025 222,112
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,419 2,976
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Total Commercial and Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 11,893 10,846
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 59,215 68,991
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 57,040 67,241
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 171 802
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 2,004 948
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 143,122 166,943
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 131,985 154,871
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,248 2,174
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 9,889 9,898
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 51,282 49,795
Acquired Loans [Member] | Business Banking Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 51,282 49,795
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 47,983 46,032
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,299 3,763
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 51,282 49,795
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 47,983 46,032
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,299 3,763
Acquired Loans [Member] | Consumer Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 69,173 95,427
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 68,717 94,822
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 456 605
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 12,309 27,775
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 12,250 27,670
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 59 105
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 53,606 63,727
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 53,251 63,270
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 355 457
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,258 3,925
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,216 3,882
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 42 43
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 207,289 230,358
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 204,276 227,448
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,013 2,910
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 207,289 230,358
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 204,276 227,448
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable $ 3,013 $ 2,910