Segment and Related Information - Narrative (Details)
|
3 Months Ended |
|
Mar. 31, 2018
office
banking_office
segment
subsidiary_trust
|
|---|
| Segment Reporting Information [Line Items] |
|
| Number of reportable segments | segment |
3
|
| Nature of operations, number of unconsolidated subsidiary trusts | subsidiary_trust |
4
|
| Tompkins Insurance Agencies Inc |
|
| Segment Reporting Information [Line Items] |
|
| Noncontrolling interest, ownership percentage by parent |
100.00%
|
| Ithaca, NY |
|
| Segment Reporting Information [Line Items] |
|
| Nature of operations, number of banking offices |
14
|
| Genesee Valley Region, New York State |
|
| Segment Reporting Information [Line Items] |
|
| Nature of operations, number of banking offices |
17
|
| Counties North of New York City |
|
| Segment Reporting Information [Line Items] |
|
| Nature of operations, number of banking offices |
14
|
| Southeastern Pennsylvania |
|
| Segment Reporting Information [Line Items] |
|
| Nature of operations, number of banking offices |
21
|
| Western New York |
|
| Segment Reporting Information [Line Items] |
|
| Number of offices | office |
5
|
| Tompkins County, New York |
|
| Segment Reporting Information [Line Items] |
|
| Number of offices | office |
1
|
| Montgomery County, Pennsylvania |
|
| Segment Reporting Information [Line Items] |
|
| Number of offices | office |
1
|