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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income attributable to noncontrolling interests and Tompkins Financial Corporation $ 23,673 $ 18,669 $ 64,823 $ 51,285
Available-for-sale debt securities:        
Change in net unrealized gain (loss) during the period 11,235 34,300 34,396 23,221
Reclassification adjustment for net realized (gain) loss on sale of available-for-sale debt securities included in net income 0 (38) 0 (38)
Employee benefit plans:        
Amortization of net retirement plan actuarial loss 71 173 213 518
Amortization of net retirement plan prior service cost 36 35 110 104
Other comprehensive income (loss) 11,342 34,470 34,719 23,805
Subtotal comprehensive income attributable to noncontrolling interests and Tompkins Financial Corporation 35,015 53,139 99,542 75,090
Less: Net income attributable to noncontrolling interests 0 31 0 93
Total comprehensive income attributable to Tompkins Financial Corporation $ 35,015 $ 53,108 $ 99,542 $ 74,997