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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 | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 3,118,241 | $ 3,122,940
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 4,700 | 3,700
Commercial [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,611,593 | 1,619,235
Commercial [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,412,586 | 1,430,207
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 |  | $ 110,798 | 97,513
Commercial [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 27,296 | 26,948
Commercial [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 60,529 | 63,998
Commercial [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 384 | 569
Commercial [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 78,647 | 76,479
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 70,672 | 67,846
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,329 | 3,323
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,060 | 1,304
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 3,586 | 3,828
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 178
Commercial [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,191,628 | 1,188,680
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,048,623 | 1,053,701
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 75,602 | 65,182
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 22,082 | 22,401
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 45,149 | 47,223
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 172 | 173
Commercial [Member] | Equipment Leases [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 2,683 | 3,042
Commercial [Member] | Equipment Leases [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 2,683 | 3,005
Commercial [Member] | Equipment Leases [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Leases [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 37
Commercial [Member] | Equipment Leases [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 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 |  | 338,635 | 351,034
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 290,608 | 305,655
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 31,867 | 29,008
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 4,154 | 3,206
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 11,794 | 12,947
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 212 | 218
Residential [Member] | Construction [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 63,893 | 67,358
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 63,769 | 66,817
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 124 | 541
Residential [Member] | Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 718,758 | 709,570
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 707,018 | 695,034
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 11,740 | 14,536
Residential [Member] | Home Equity [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 99,593 | 99,356
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 98,965 | 98,800
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 628 | 556
Consumer [Member] | Consumer Direct [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 136,576 | 137,754
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 136,558 | 137,692
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 18 | 62
Consumer [Member] | Consumer Indirect [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 487,828 | 489,667
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 487,361 | 489,019
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | 467 | 648
Residential and Consumer Portfolio Segments [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,506,648 | 1,503,705
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile |  | 1,493,671 | 1,487,362
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 12,977 | $ 16,343
[1] | A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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