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Loans (Recorded Investment by Loan Class in Current and Nonaccrual Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | $ 3,732 | $ 7,081 |
Investment securities, nonaccrual | 13,125 | 8,634 |
Current | 3,434,672 | 3,163,750 |
Total Loans | 3,451,529 | 3,179,465 | $ 3,110,064
Nonaccrual with no allowance | 11,854 |  |
30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 3,044 | 5,897 |
60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 631 | 1,178 |
Greater than 90 Days [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 57 | 6 |
Commercial Business [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 426 | 361 |
Investment securities, nonaccrual | 4,918 | 1,177 |
Current | 819,474 | 569,684 |
Total Loans | 824,818 | 571,222 | 594,121
Nonaccrual with no allowance | 3,647 |  |
Commercial Business [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 398 | 361 |
Commercial Business [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 28 |  |
Commercial Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 184 | 531 |
Investment securities, nonaccrual | 4,140 | 3,146 |
Current | 1,138,035 | 1,104,638 |
Total Loans | 1,142,359 | 1,108,315 | 1,011,925
Nonaccrual with no allowance | 4,140 |  |
Commercial Mortgage [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 115 | 531 |
Commercial Mortgage [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 69 |  |
Residential Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 813 | 1,043 |
Investment securities, nonaccrual | 2,992 | 2,484 |
Current | 568,757 | 557,190 |
Total Loans | 572,562 | 560,717 | 535,873
Nonaccrual with no allowance | 2,992 |  |
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 786 | 929 |
Residential Real Estate Loans [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 27 | 114 |
Residential Real Estate Lines [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 109 | 268 |
Investment securities, nonaccrual | 177 | 102 |
Current | 93,999 | 100,678 |
Total Loans | 94,285 | 101,048 | 104,937
Nonaccrual with no allowance | 177 |  |
Residential Real Estate Lines [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 74 | 231 |
Residential Real Estate Lines [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 35 | 37 |
Consumer Indirect [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,995 | 4,748 |
Investment securities, nonaccrual | 868 | 1,725 |
Current | 798,571 | 815,706 |
Total Loans | 801,434 | 822,179 | 846,829
Nonaccrual with no allowance | 868 |  |
Consumer Indirect [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 1,571 | 3,729 |
Consumer Indirect [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 424 | 1,019 |
Other Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 205 | 130 |
Investment securities, nonaccrual | 30 |  |
Current | 15,836 | 15,854 |
Total Loans | 16,071 | 15,984 | $ 16,379
Nonaccrual with no allowance | 30 |  |
Other Consumer [Member] | 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 100 | 116 |
Other Consumer [Member] | 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | 48 | 8 |
Other Consumer [Member] | Greater than 90 Days [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due Loans | $ 57 | $ 6 |

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