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Segment and Related Information - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 segment | Dec. 31, 2023 banking_Office | Dec. 31, 2023 Segment | Dec. 31, 2023 office
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable business segments | 3 |  | 3 |
Tompkins Insurance Agencies Inc |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Ownership percentage by parent | 100.00% | 100.00% | 100.00% | 100.00%
Ithaca, NY |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of banking offices |  | 12 |  |
Genesee Valley Region |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of banking offices |  | 15 |  |
Counties North of New York City |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of banking offices |  | 13 |  |
Southeastern Pennsylvania |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of banking offices |  | 16 |  |
Western New York |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nature of operations, number of offices | office |  |  |  | 4

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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 -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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