Segment and Related Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Interest income $ 50,417 $ 46,423 $ 99,726 $ 92,651    
Interest expense 5,510 5,093 10,781 10,093    
Net interest income 44,907 41,330 88,945 82,558    
Provision for loan and lease losses 978 922 1,833 1,131    
Noninterest income 17,084 18,962 34,587 36,608    
Noninterest expense 39,388 32,918 78,894 72,610    
Income before income tax expense 21,625 26,452 42,805 45,425    
Income tax expense 7,022 9,030 13,989 15,290    
Net Income attributable to noncontrolling interests and Tompkins Financial Corporation 14,603 17,422 28,816 30,135    
Less: Net income attributable to noncontrolling interests 32 32 65 65    
Net income attributable to Tompkins Financial Corporation 14,571 17,390 28,751 30,070    
Depreciation and amortization 1,671 1,642 3,356 3,209    
Assets 5,924,906 5,436,136 5,924,906 5,436,136 $ 5,689,995  
Goodwill 92,942 92,243 92,942 92,243 91,792  
Other intangibles, net 12,532 13,569 12,532 13,569 12,448  
Net loans and leases 3,944,988 3,491,840 3,944,988 3,491,840 3,740,038  
Deposits 4,469,721 4,204,089 4,469,721 4,204,089 4,395,306  
Total Equity 554,435 505,394 554,435 505,394 $ 516,466 $ 489,583
Banking [Member]            
Interest income 50,417 46,383 99,726 92,576    
Interest expense 5,510 5,093 10,781 10,094    
Net interest income 44,907 41,290 88,945 82,482    
Provision for loan and lease losses 978 922 1,833 1,131    
Noninterest income 5,861 7,664 12,132 14,054    
Noninterest expense 30,645 24,895 61,018 55,846    
Income before income tax expense 19,145 23,137 38,226 39,559    
Income tax expense 6,080 7,793 12,276 13,105    
Net Income attributable to noncontrolling interests and Tompkins Financial Corporation 13,065 15,344 25,950 26,454    
Less: Net income attributable to noncontrolling interests 32 32 65 65    
Net income attributable to Tompkins Financial Corporation 13,033 15,312 25,885 26,389    
Depreciation and amortization 1,561 1,518 3,136 2,962    
Assets 5,877,758 5,391,491 5,877,758 5,391,491    
Goodwill 64,370 64,500 64,370 64,500    
Other intangibles, net 7,133 8,554 7,133 8,554    
Net loans and leases 3,944,988 3,491,840 3,944,988 3,491,840    
Deposits 4,477,266 4,210,387 4,477,266 4,210,387    
Total Equity 512,711 466,508 512,711 466,508    
Insurance [Member]            
Interest income 0 0 1 1    
Interest expense 0 0 1 0    
Net interest income 0 0 0 1    
Provision for loan and lease losses 0 0 0 0    
Noninterest income 7,556 7,480 15,155 14,887    
Noninterest expense 6,160 5,568 12,500 11,584    
Income before income tax expense 1,396 1,912 2,655 3,304    
Income tax expense 575 763 1,076 1,317    
Net Income attributable to noncontrolling interests and Tompkins Financial Corporation 821 1,149 1,579 1,987    
Less: Net income attributable to noncontrolling interests 0 0 0 0    
Net income attributable to Tompkins Financial Corporation 821 1,149 1,579 1,987    
Depreciation and amortization 91 92 182 184    
Assets 41,272 37,214 41,272 37,214    
Goodwill 20,361 19,662 20,361 19,662    
Other intangibles, net 5,003 4,534 5,003 4,534    
Net loans and leases 0 0 0 0    
Deposits 0 0 0 0    
Total Equity 30,684 27,408 30,684 27,408    
Wealth Management [Member]            
Interest income 0 40 0 75    
Interest expense 0 0 0 0    
Net interest income 0 40 0 75    
Provision for loan and lease losses 0 0 0 0    
Noninterest income 3,956 4,004 7,866 8,131    
Noninterest expense 2,872 2,641 5,942 5,644    
Income before income tax expense 1,084 1,403 1,924 2,562    
Income tax expense 367 474 637 868    
Net Income attributable to noncontrolling interests and Tompkins Financial Corporation 717 929 1,287 1,694    
Less: Net income attributable to noncontrolling interests 0 0 0 0    
Net income attributable to Tompkins Financial Corporation 717 929 1,287 1,694    
Depreciation and amortization 19 32 38 63    
Assets 13,701 13,950 13,701 13,950    
Goodwill 8,211 8,081 8,211 8,081    
Other intangibles, net 396 481 396 481    
Net loans and leases 0 0 0 0    
Deposits 0 0 0 0    
Total Equity 11,040 11,478 11,040 11,478    
Intercompany [Member]            
Interest income 0 0 (1) (1)    
Interest expense 0 0 (1) (1)    
Net interest income 0 0 0 0    
Provision for loan and lease losses 0 0 0 0    
Noninterest income (289) (186) (566) (464)    
Noninterest expense (289) (186) (566) (464)    
Income before income tax expense 0 0 0 0    
Income tax expense 0 0 0 0    
Net Income attributable to noncontrolling interests and Tompkins Financial Corporation 0 0 0 0    
Less: Net income attributable to noncontrolling interests 0 0 0 0    
Net income attributable to Tompkins Financial Corporation 0 0 0 0    
Depreciation and amortization 0 0 0 0    
Assets (7,825) (6,519) (7,825) (6,519)    
Goodwill 0 0 0 0    
Other intangibles, net 0 0 0 0    
Net loans and leases 0 0 0 0    
Deposits (7,545) (6,298) (7,545) (6,298)    
Total Equity $ 0 $ 0 $ 0 $ 0