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Segment and Related Information - Narrative (Details) | 6 Months Ended
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Jun. 30, 2025 banking_office segment office
Segment Reporting Information [Line Items] |
Number of reportable segments | segment | 3
Tompkins Insurance Agencies Inc |
Segment Reporting Information [Line Items] |
Noncontrolling interest, ownership percentage by parent | 100.00%
Tompkins, Cayuga, Cortland and Schuyler Counties, New York |
Segment Reporting Information [Line Items] |
Number of banking offices | 12
Wyoming, Livingston, Genessee, Orleans and Monroe, New York |
Segment Reporting Information [Line Items] |
Number of banking offices | 14
Putnam Country, Dutchess Country and Westchester, New York |
Segment Reporting Information [Line Items] |
Number of banking offices | 12
Berks, Montgomery, Philadelphia, Deleware and Schuylkill, 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/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 47 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-47 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 54 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-54 Reference 3: 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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