Condensed Parent Company Only Financial Statements - Condensed Statements of Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Investment in subsidiaries, at equity	$ 1,500
Total Assets	7,622,171	$ 6,725,623	$ 6,758,436
Liabilities and Shareholders’ Equity
Trust preferred debentures issued to non-consolidated subsidiary	13,220	17,035
Other liabilities	122,665	114,167
Tompkins Financial Corporation Shareholders’ Equity	716,277	661,642
Total Liabilities and Equity	7,622,171	6,725,623
Tompkins (the Parent Company)
Assets
Cash	16,588	14,631
Investment in subsidiaries, at equity	707,721	664,775
Other	5,965	3,873
Total Assets	730,274	683,279
Liabilities and Shareholders’ Equity
Borrowings	0	4,000
Trust preferred debentures issued to non-consolidated subsidiary	13,220	17,035
Other liabilities	777	602
Tompkins Financial Corporation Shareholders’ Equity	716,277	661,642
Total Liabilities and Equity	$ 730,274	$ 683,279