Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Interest income	$ 251,324	$ 241,318	$ 254,330
Interest expense	21,043	17,526	28,991
Net interest income	230,281	223,792	225,339
Provision (credit) for credit loss expense	2,789	(2,219)	17,213
Noninterest income	77,972	78,849	73,860
Noninterest expense	195,751	190,287	184,320
Income Before Income Tax Expense	109,713	114,573	97,666
Income tax expense	24,557	25,182	19,924
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation	85,156	89,391	77,742
Less: Net income attributable to noncontrolling interests	126	127	154
Net Income Attributable to Tompkins Financial Corporation	85,030	89,264	77,588
Depreciation and amortization	10,684	10,250	10,192
Assets	7,670,686	7,819,982	7,622,171
Goodwill	92,602	92,447	92,447
Other intangibles, net	2,708	3,643	4,905
Net Loans and Leases	5,222,977	5,032,624	5,208,658
Deposits	6,602,295	6,791,435	6,437,752
Total equity	617,390	728,941	717,689	$ 663,054
Banking
Segment Reporting Information [Line Items]
Goodwill	64,524	64,369	64,369
Insurance
Segment Reporting Information [Line Items]
Goodwill	19,867	19,867	19,867
Wealth Management
Segment Reporting Information [Line Items]
Goodwill	8,211	8,211	8,211
Operating Segments | Banking
Segment Reporting Information [Line Items]
Interest income	251,324	241,322	254,330
Interest expense	21,048	17,541	28,995
Net interest income	230,276	223,781	225,335
Provision (credit) for credit loss expense	2,789	(2,219)	17,213
Noninterest income	25,394	25,944	26,015
Noninterest expense	156,186	152,624	147,680
Income Before Income Tax Expense	96,695	99,320	86,457
Income tax expense	21,085	21,257	17,033
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation	75,610	78,063	69,424
Less: Net income attributable to noncontrolling interests	126	127	154
Net Income Attributable to Tompkins Financial Corporation	75,484	77,936	69,270
Depreciation and amortization	10,366	9,987	9,912
Assets	7,610,701	7,794,561	7,564,342
Goodwill	64,524	64,370	64,370
Other intangibles, net	1,004	1,571	2,418
Net Loans and Leases	5,222,977	5,032,624	5,208,658
Deposits	6,614,659	6,802,852	6,449,289
Total equity	559,123	664,800	660,334
Operating Segments | Insurance
Segment Reporting Information [Line Items]
Interest income	5	11	4
Interest expense	0	0	0
Net interest income	5	11	4
Provision (credit) for credit loss expense	0	0	0
Noninterest income	36,721	35,430	31,930
Noninterest expense	27,678	26,857	25,941
Income Before Income Tax Expense	9,048	8,584	5,993
Income tax expense	2,504	2,326	1,625
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation	6,544	6,258	4,368
Less: Net income attributable to noncontrolling interests	0	0	0
Net Income Attributable to Tompkins Financial Corporation	6,544	6,258	4,368
Depreciation and amortization	175	208	229
Assets	45,090	42,879	41,812
Goodwill	19,867	19,866	19,866
Other intangibles, net	1,655	2,004	2,398
Net Loans and Leases	0	0	0
Deposits	0	0	0
Total equity	35,155	33,171	31,455
Operating Segments | Wealth Management
Segment Reporting Information [Line Items]
Interest income	0	0	0
Interest expense	0	0	0
Net interest income	0	0	0
Provision (credit) for credit loss expense	0	0	0
Noninterest income	18,129	19,727	18,131
Noninterest expense	14,159	13,058	12,915
Income Before Income Tax Expense	3,970	6,669	5,216
Income tax expense	968	1,599	1,266
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation	3,002	5,070	3,950
Less: Net income attributable to noncontrolling interests	0	0	0
Net Income Attributable to Tompkins Financial Corporation	3,002	5,070	3,950
Depreciation and amortization	143	55	51
Assets	28,977	33,735	28,616
Goodwill	8,211	8,211	8,211
Other intangibles, net	49	68	89
Net Loans and Leases	0	0	0
Deposits	1,079	0	0
Total equity	23,112	30,970	25,900
Intercompany
Segment Reporting Information [Line Items]
Interest income	(5)	(15)	(4)
Interest expense	(5)	(15)	(4)
Net interest income	0	0	0
Provision (credit) for credit loss expense	0	0	0
Noninterest income	(2,272)	(2,252)	(2,216)
Noninterest expense	(2,272)	(2,252)	(2,216)
Income Before Income Tax Expense	0	0	0
Income tax expense	0	0	0
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation	0	0	0
Less: Net income attributable to noncontrolling interests	0	0	0
Net Income Attributable to Tompkins Financial Corporation	0	0	0
Depreciation and amortization	0	0	0
Assets	(14,082)	(51,193)	(12,599)
Goodwill	0	0	0
Other intangibles, net	0	0	0
Net Loans and Leases	0	0	0
Deposits	(13,443)	(11,417)	(11,537)
Total equity	$ 0	$ 0	$ 0