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Loans, Credit Risk Profile Based on Rating Category and Payment Activity and on Performing and Nonperforming Status, Segregated by Class (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 3,087,342 | $ 2,938,371
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 5,000 | 3,500
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,608,359 | 1,508,097
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,426,421 | 1,335,205
Commercial [Member] | Pass [Member] | Minimum [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Review period for loans |  | 12 months |
Commercial [Member] | Pass [Member] | Maximum [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Review period for loans |  | 18 months |
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 99,443 | 88,215
Commercial [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 34,213 | 36,389
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 47,382 | 47,136
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 900 | 1,152
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 72,054 | 66,998
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 62,033 | 55,315
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,988 | 3,366
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,874 | 2,535
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,981 | 5,592
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 178 | 190
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,179,229 | 1,085,428
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,056,938 | 975,383
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 64,594 | 51,932
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 23,458 | 25,772
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 33,882 | 31,945
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 357 | 396
Commercial [Member] | Equipment Leases [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 4,903 | 5,512
Commercial [Member] | Equipment Leases [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 4,667 | 5,206
Commercial [Member] | Equipment Leases [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 137
Commercial [Member] | Equipment Leases [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 106 | 169
Commercial [Member] | Equipment Leases [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 130 | 0
Commercial [Member] | Equipment Leases [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Other [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 352,173 | 350,159
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 302,783 | 299,301
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 30,861 | 32,780
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 8,775 | 7,913
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 9,389 | 9,599
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 365 | 566
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 58,566 | 57,966
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 58,172 | 57,803
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 394 | 163
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 708,467 | 702,969
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 695,964 | 690,414
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 12,503 | 12,555
Residential [Member] | Home Equity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 93,721 | 91,511
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 92,865 | 90,489
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 856 | 1,022
Consumer [Member] | Consumer Direct [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 135,228 | 133,093
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 135,194 | 133,025
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 34 | 68
Consumer [Member] | Consumer Indirect [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 483,001 | 444,735
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 482,780 | 444,054
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 221 | 681
Residential and Consumer Portfolio Segments [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,478,983 | 1,430,274
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,464,975 | 1,415,785
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 14,008 | $ 14,489
[1] | A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.

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