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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 2,820,460 | $ 2,733,824
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 5,300 | 5,900
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,459,973 | 1,432,960
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,277,219 | 1,253,679
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 |  | $ 117,555 | 115,094
Commercial [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 13,492 | 12,788
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 48,612 | 39,320
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,095 | 12,079
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 106,855 | 121,942
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 85,878 | 101,314
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 6,615 | 9,857
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 4,205 | 934
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 8,999 | 5,647
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,158 | 4,190
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 997,654 | 948,626
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 885,941 | 834,751
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 69,393 | 69,123
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 8,286 | 10,973
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 33,162 | 27,901
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 872 | 5,878
Commercial [Member] | Equipment Lease [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 9,146 | 10,344
Commercial [Member] | Equipment Lease [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 9,146 | 10,344
Commercial [Member] | Equipment Lease [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Lease [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Lease [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Lease [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 |  | 346,318 | 352,048
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 296,254 | 307,270
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 41,547 | 36,114
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,001 | 881
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 6,451 | 5,772
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,065 | 2,011
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 62,226 | 62,412
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 61,495 | 61,427
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 731 | 985
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 706,187 | 712,465
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 693,968 | 698,210
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 12,219 | 14,255
Residential [Member] | Home Equity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 88,624 | 88,335
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 87,822 | 87,544
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 802 | 791
Consumer [Member] | Consumer Direct [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 125,847 | 122,136
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 125,644 | 121,995
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 203 | 141
Consumer [Member] | Indirect [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 377,603 | 315,516
Consumer [Member] | Indirect [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 377,184 | 315,131
Consumer [Member] | Indirect [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 419 | 385
Residential and Consumer Portfolio Segments [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,360,487 | 1,300,864
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,346,113 | 1,284,307
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 14,374 | $ 16,557
[1] | A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.

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