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Allowance for Loan Losses and Credit Quality of Loans, Credit Quality by Loan Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Originated Loans [Member] | Commercial Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable $ 1,894,488 $ 1,741,936
Originated Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,786,166 1,648,664
Originated Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 47,120 23,680
Originated Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 61,194 69,584
Originated Loans [Member] | Commercial Credit Exposure [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 8 8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 650,991 615,147
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 600,507 570,884
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 18,395 6,022
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 32,089 38,241
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 1,183,296 1,068,868
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,127,116 1,023,856
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 28,718 17,341
Originated Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 27,462 27,671
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 33,386 32,947
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 32,759 30,481
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1 275
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 618 2,183
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 8 8
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 26,815 24,974
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 25,784 23,443
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 6 42
Originated Loans [Member] | Commercial Credit Exposure [Member] | Agricultural Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,025 1,489
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] | Business Banking Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 402,690 398,435
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 387,378 379,445
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 15,312 18,990
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 402,690 398,435
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 387,378 379,445
Originated Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 15,312 18,990
Originated Loans [Member] | Consumer Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,984,440 1,858,724
Originated Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,975,269 1,847,216
Originated Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 9,171 11,508
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,453,352 1,310,050
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 1,450,146 1,306,095
Originated Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,206 3,955
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 473,662 492,880
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 467,842 485,463
Originated Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 5,820 7,417
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 57,426 55,794
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 57,281 55,658
Originated Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 145 136
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 935,549 848,842
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 925,834 838,816
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 9,715 10,026
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 935,549 848,842
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 925,834 838,816
Originated Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 9,715 10,026
Acquired Loans [Member] | Commercial Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 253,892 275,152
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 230,718 249,666
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 6,719 5,486
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 16,455 20,000
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 72,062 75,264
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 66,770 63,630
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 939 2,840
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,353 8,794
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 181,830 199,888
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 163,948 186,036
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 5,780 2,646
Acquired Loans [Member] | Commercial Credit Exposure [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 12,102 11,206
Acquired Loans [Member] | Business Banking Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 51,315 58,179
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 47,310 53,264
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,005 4,915
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 51,315 58,179
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Non-classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 47,310 53,264
Acquired Loans [Member] | Business Banking Credit Exposure [Member] | Business Banking [Member] | Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,005 4,915
Acquired Loans [Member] | Consumer Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 106,968 147,256
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 106,232 146,494
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 736 762
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 35,022 65,223
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 34,912 65,063
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Indirect [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 110 160
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 67,902 76,716
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 67,311 76,154
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Home Equity [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 591 562
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,044 5,317
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 4,009 5,277
Acquired Loans [Member] | Consumer Credit Exposure [Member] | Direct [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 35 40
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 241,646 266,747
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 238,270 262,883
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 3,376 3,864
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 241,646 266,747
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable 238,270 262,883
Acquired Loans [Member] | Residential Mortgage Credit Exposure [Member] | Residential Mortgage [Member] | Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable $ 3,376 $ 3,864