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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 3,208,638 | $ 3,122,940
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process |  | 3,300 | 3,700
Commercial [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,644,746 | 1,619,235
Commercial [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | $ 1,441,702 | 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 |  | $ 103,890 | 97,513
Commercial [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 27,063 | 26,948
Commercial [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 71,924 | 63,998
Commercial [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 167 | 569
Commercial [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 82,715 | 76,479
Commercial [Member] | Construction [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 74,222 | 67,846
Commercial [Member] | Construction [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 3,070 | 3,323
Commercial [Member] | Construction [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,594 | 1,304
Commercial [Member] | Construction [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 3,829 | 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 |  | 1,183,093 | 1,188,680
Commercial [Member] | Real Estate [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,038,309 | 1,053,701
Commercial [Member] | Real Estate [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 71,834 | 65,182
Commercial [Member] | Real Estate [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 19,734 | 22,401
Commercial [Member] | Real Estate [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 53,125 | 47,223
Commercial [Member] | Real Estate [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 91 | 173
Commercial [Member] | Equipment Lease [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,740 | 3,042
Commercial [Member] | Equipment Lease [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,740 | 3,005
Commercial [Member] | Equipment Lease [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Lease [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 37
Commercial [Member] | Equipment Lease [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 0 | 0
Commercial [Member] | Equipment Lease [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 |  | 377,198 | 351,034
Commercial [Member] | Other [Member] | Pass [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 327,431 | 305,655
Commercial [Member] | Other [Member] | Watch [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 28,986 | 29,008
Commercial [Member] | Other [Member] | OAEM [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 5,735 | 3,206
Commercial [Member] | Other [Member] | Substandard [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 14,970 | 12,947
Commercial [Member] | Other [Member] | Doubtful [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 76 | 218
Residential [Member] | Construction [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 57,160 | 67,358
Residential [Member] | Construction [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 57,132 | 66,817
Residential [Member] | Construction [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 28 | 541
Residential [Member] | Real Estate [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 722,417 | 709,570
Residential [Member] | Real Estate [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 712,927 | 695,034
Residential [Member] | Real Estate [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 9,490 | 14,536
Residential [Member] | Home Equity [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 106,299 | 99,356
Residential [Member] | Home Equity [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 105,576 | 98,800
Residential [Member] | Home Equity [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 723 | 556
Consumer [Member] | Consumer Direct [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 144,289 | 137,754
Consumer [Member] | Consumer Direct [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 144,215 | 137,692
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 74 | 62
Consumer [Member] | Consumer Indirect [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 533,727 | 489,667
Consumer [Member] | Consumer Indirect [Member] | Performing [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 533,221 | 489,019
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile | [1] | 506 | 648
Residential and Consumer Portfolio Segments [Member] |  |  |
Credit Risk Profile, Segregated by Class [Abstract] |  |  |
Loan portfolio based on credit risk profile |  | 1,563,892 | 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 |  | 1,553,071 | 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] | $ 10,821 | $ 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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