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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 |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 3,177,888 | $ 3,122,940
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 4,400 | 3,700
Commercial [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,613,735 | 1,619,235
Commercial [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,400,940 | 1,430,207
Commercial [Member] | Pass [Member] | Minimum [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Review period for loans |  | 12 months |
Commercial [Member] | Pass [Member] | Maximum [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Review period for loans |  | 18 months |
Commercial [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 107,822 | 97,513
Commercial [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 26,435 | 26,948
Commercial [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 78,347 | 63,998
Commercial [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 191 | 569
Commercial [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 81,472 | 76,479
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 74,592 | 67,846
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 3,133 | 3,323
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,626 | 1,304
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 2,121 | 3,828
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 178
Commercial [Member] | Real Estate [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,183,632 | 1,188,680
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,029,800 | 1,053,701
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 74,669 | 65,182
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 17,906 | 22,401
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 61,146 | 47,223
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 111 | 173
Commercial [Member] | Equipment Leases [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,986 | 3,042
Commercial [Member] | Equipment Leases [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,986 | 3,005
Commercial [Member] | Equipment Leases [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Leases [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 37
Commercial [Member] | Equipment Leases [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Leases [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Other [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 346,645 | 351,034
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 294,562 | 305,655
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 30,020 | 29,008
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 6,903 | 3,206
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 15,080 | 12,947
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 80 | 218
Residential [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 61,782 | 67,358
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 61,749 | 66,817
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 33 | 541
Residential [Member] | Real Estate [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 722,022 | 709,570
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 711,208 | 695,034
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 10,814 | 14,536
Residential [Member] | Home Equity [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 103,805 | 99,356
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 103,009 | 98,800
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 796 | 556
Consumer [Member] | Consumer Direct [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 146,002 | 137,754
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 145,966 | 137,692
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 36 | 62
Consumer [Member] | Consumer Indirect [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 530,542 | 489,667
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 529,897 | 489,019
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 645 | 648
Residential and Consumer Portfolio Segments [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,564,153 | 1,503,705
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,551,829 | 1,487,362
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 12,324 | $ 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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