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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, 2016 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 2,931,299 | $ 2,873,961
Consumer mortgage loans secured by real estate properties in formal foreclosure proceedings |  | 3,300 | 4,400
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,513,141 | 1,498,351
Commercial [Member] | Minimum [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Review period for loans |  | 12 months |
Commercial [Member] | Maximum [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Review period for loans |  | 18 months |
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,336,631 | 1,320,788
Commercial [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 89,876 | 114,431
Commercial [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 37,050 | 16,934
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 48,018 | 43,084
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,566 | 3,114
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 68,275 | 78,020
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 55,878 | 62,978
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 4,006 | 4,931
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 2,330 | 2,206
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 5,871 | 6,780
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 190 | 1,125
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,083,640 | 1,052,919
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 970,069 | 937,196
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 54,232 | 71,830
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 27,688 | 13,765
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 31,095 | 29,232
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 556 | 896
Commercial [Member] | Equipment Lease [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 6,242 | 8,514
Commercial [Member] | Equipment Lease [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 5,885 | 8,514
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 |  | 357 | 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 |  | 354,984 | 358,898
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 304,799 | 312,100
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 31,638 | 37,670
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 6,675 | 963
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 11,052 | 7,072
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 820 | 1,093
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 55,412 | 61,750
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 54,923 | 61,446
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 489 | 304
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 706,028 | 707,874
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 695,734 | 695,743
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 10,294 | 12,131
Residential [Member] | Home Equity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 89,467 | 89,450
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 88,740 | 88,819
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 727 | 631
Consumer [Member] | Consumer Direct [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 131,815 | 126,406
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 131,706 | 126,170
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 109 | 236
Consumer [Member] | Consumer Indirect [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 435,436 | 390,130
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 435,119 | 389,735
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 317 | 395
Residential and Consumer Portfolio Segments [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,418,158 | 1,375,610
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,406,222 | 1,361,913
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 11,936 | $ 13,697
[1] | A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.

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