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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 | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 2,792,831 | $ 2,733,824
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 6,300 | 5,900
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,463,398 | 1,432,960
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,292,198 | 1,253,679
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 111,659 | 115,094
Commercial [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 11,886 | 12,788
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 39,162 | 39,320
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 8,493 | 12,079
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 111,218 | 121,942
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 91,970 | 101,314
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 7,954 | 9,857
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,939 | 934
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 5,656 | 5,647
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,699 | 4,190
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 978,412 | 948,626
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 866,899 | 834,751
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 70,847 | 69,123
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 8,998 | 10,973
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 27,750 | 27,901
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,918 | 5,878
Commercial [Member] | Equipment Lease [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 9,859 | 10,344
Commercial [Member] | Equipment Lease [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 9,859 | 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 |  | 363,909 | 352,048
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 323,470 | 307,270
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 32,858 | 36,114
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 949 | 881
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 5,756 | 5,772
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 876 | 2,011
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 57,914 | 62,412
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 57,324 | 61,427
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 590 | 985
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 707,582 | 712,465
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 694,580 | 698,210
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 13,002 | 14,255
Residential [Member] | Home Equity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 88,113 | 88,335
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 87,505 | 87,544
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 608 | 791
Consumer [Member] | Consumer Direct [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 121,620 | 122,136
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 121,500 | 121,995
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 120 | 141
Consumer [Member] | Indirect [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 354,204 | 315,516
Consumer [Member] | Indirect [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 353,945 | 315,131
Consumer [Member] | Indirect [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 259 | 385
Residential and Consumer Portfolio Segments [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,329,433 | 1,300,864
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,314,854 | 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] | $ 14,579 | $ 16,557
[1] | A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.

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