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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, 2019 | Dec. 31, 2018
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 3,189,732 | $ 3,208,638
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 3,000 | 3,300
Commercial [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,647,582 | 1,644,746
Commercial [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,438,598 | 1,441,702
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 |  | $ 105,653 | 103,890
Commercial [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 26,135 | 27,063
Commercial [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 77,036 | 71,924
Commercial [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 160 | 167
Commercial [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 75,364 | 82,715
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 67,224 | 74,222
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 2,932 | 3,070
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,823 | 1,594
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 3,385 | 3,829
Commercial [Member] | Construction [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Real Estate [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,182,804 | 1,183,093
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,031,325 | 1,038,309
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 75,404 | 71,834
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 18,501 | 19,734
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 57,485 | 53,125
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 89 | 91
Commercial [Member] | Equipment Leases [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,354 | 1,740
Commercial [Member] | Equipment Leases [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,354 | 1,740
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 | 0
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 |  | 388,060 | 377,198
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 338,695 | 327,431
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 27,317 | 28,986
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 5,811 | 5,735
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 16,166 | 14,970
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 71 | 76
Residential [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 54,013 | 57,160
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 53,718 | 57,132
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 295 | 28
Residential [Member] | Real Estate [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 720,292 | 722,417
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 711,398 | 712,927
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 8,894 | 9,490
Residential [Member] | Home Equity [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 108,018 | 106,299
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 107,275 | 105,576
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 743 | 723
Consumer [Member] | Consumer Direct [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 141,855 | 144,289
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 141,825 | 144,215
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 30 | 74
Consumer [Member] | Consumer Indirect [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 517,972 | 533,727
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 517,582 | 533,221
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 390 | 506
Residential and Consumer Portfolio Segments [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,542,150 | 1,563,892
Residential and Consumer Portfolio Segments [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,531,798 | 1,553,071
Residential and Consumer Portfolio Segments [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | $ 10,352 | $ 10,821
[1] | A loan is considered nonperforming if it is 90 days or more past due and/or on nonaccrual.

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