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Segment and Related Information - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 segment | Dec. 31, 2021 subsidiary_Bank | Dec. 31, 2021 banking_Office | Dec. 31, 2021 subsidiaryTrust | Dec. 31, 2021 office | Dec. 31, 2020 banking_Office | Dec. 31, 2019 banking_Office
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of reportable business segments | 3 |  |  | 3 |  |  |
Number of subsidiary banks (banking office) |  | 4 |  |  |  | 4 | 4
Ithaca, NY |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of banking offices |  |  | 13 |  |  |  |
Genesee Valley Region |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of banking offices |  |  | 16 |  |  |  |
Counties North of New York City |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of banking offices |  |  | 14 |  |  |  |
Southeastern Pennsylvania |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of banking offices |  |  | 20 |  |  |  |
Western New York |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Nature of operations, number of offices | office |  |  |  |  | 5 |  |

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599 + Details
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