| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| OPERATING ACTIVITIES | | | | | | | | |
| Net income attributable to Tompkins Financial Corporation | 85.0 | 89.3 | 77.6 | 81.7 | 82.3 | 52.5 | 59.3 | 58.4 |
| Depreciation and amortization of premises, equipment, and software | 10.7 | 10.3 | 10.2 | 10.0 | 9.6 | 8.3 | 6.8 | 6.5 |
| Amortization of intangible assets | 0.9 | 1.3 | 1.5 | 1.7 | 1.8 | 1.9 | 2.1 | 2.0 |
| Earnings from corporate owned life insurance | -1.2 | -1.9 | -2.2 | -2.2 | -1.8 | -2.2 | -2.1 | -2.1 |
| Net amortization on securities | 5.6 | 11.8 | 10.7 | 7.4 | 8.8 | 10.5 | 11.6 | 11.9 |
| Amortization/accretion related to purchase accounting | -0.9 | -0.9 | -1.1 | | | | | |
| Net loss on securities transactions | 0.6 | -0.2 | -0.4 | -0.6 | 0.5 | 0.4 | -0.7 | -0.8 |
| Net gain on sale of loans originated for sale | -0.2 | -0.9 | -2.1 | -0.2 | -0.5 | -0.1 | -0.1 | -0.1 |
| Proceeds from sale of loans originated for sale | 9.0 | 32.5 | 53.7 | 17.1 | 28.2 | 4.6 | 4.0 | 3.3 |
| Loans originated for sale | -8.7 | -27.4 | -55.2 | -15.0 | -30.2 | -4.8 | -3.4 | -3.8 |
| Net gain on sale of bank premises and equipment | -0.1 | 0.0 | 0.0 | -0.1 | -2.9 | 0.0 | 0.0 | 0.0 |
| Net excess tax benefit from stock based compensation | 0.4 | 0.6 | 0.1 | | | | | |
| Stock-based compensation expense | 4.3 | 5.1 | 4.7 | 4.2 | 3.5 | 3.0 | 2.3 | 1.9 |
| Decrease in accrued interest receivable | 0.5 | -0.8 | -0.8 | 0.1 | 0.4 | -2.7 | -1.0 | 0.1 |
| Increase (decrease) in accrued interest payable | -2.3 | 9.4 | -12.7 | 1.6 | -0.8 | 0.2 | -0.1 | 0.1 |
| Other, net | -4.2 | -11.2 | 6.2 | -8.1 | 3.5 | -1.1 | 2.1 | 9.6 |
| Net Cash Provided by Operating Activities | 103.3 | 121.2 | 101.4 | 101.6 | 107.3 | 86.1 | 90.9 | 82.8 |
| |
| INVESTING ACTIVITIES | | | | | | | | |
| Proceeds from maturities, calls and principal paydowns of available-for-sale debt securities | 208.7 | 453.7 | 545.6 | 303.0 | 151.1 | 174.7 | 256.2 | 261.5 |
| Proceeds from sales of available-for-sale debt securities | 160.6 | 142.7 | 42.3 | 232.6 | 70.7 | 64.1 | 97.3 | 137.6 |
| Purchases of available-for-sale debt securities | -154.8 | -1,071.8 | -904.9 | -333.2 | -185.5 | -208.5 | -404.5 | -391.1 |
| Purchases of held-to-maturity securities | -28.3 | -284.0 | | -7.6 | -8.5 | -5.6 | -8.2 | -69.9 |
| Net increase in loans | -193.0 | 175.2 | -340.5 | -89.6 | | -411.8 | -485.1 | -375.2 |
| Proceeds from sale/redemptions of Federal Home Loan Bank stock | 81.4 | 9.2 | 42.7 | | | | | |
| Purchases of Federal Home Loan Bank and other stock | -88.1 | -3.8 | -25.4 | | | | | |
| Proceeds from sale of bank premises and equipment | 0.2 | 0.1 | 0.0 | 0.4 | 3.3 | 0.2 | 0.1 | 0.1 |
| Purchases of bank premises, equipment and software | -8.2 | -4.7 | -4.6 | -6.0 | -18.1 | -35.3 | -16.3 | -6.3 |
| Other, net | -0.4 | 0.0 | 0.5 | 5.2 | 0.2 | 2.6 | 0.1 | -0.8 |
| Net Cash Provided by (Used in) Investing Activities | -8.4 | -583.3 | -643.7 | 134.0 | -143.6 | -427.0 | -573.5 | -452.9 |
| |
| FINANCING ACTIVITIES | | | | | | | | |
| Net (decrease) increase in demand, money market, and savings deposits | -180.9 | 460.2 | 1,153.6 | | | | | |
| Increase in other borrowings | 435.9 | 14.0 | 74.6 | 526.9 | 524.5 | 750.9 | 761.0 | 452.8 |
| Repayment of other borrowings | -268.6 | -157.9 | -467.7 | -944.8 | -520.2 | -564.0 | -412.2 | -272.6 |
| Common stock issued | | | | | | | | 0.1 |
| Repurchase of common stock | -15.4 | -23.8 | -9.4 | -29.9 | -2.4 | | -1.2 | -3.5 |
| Shares issued for employee stock ownership plan | 3.0 | | | -1.0 | 3.1 | 2.3 | 1.9 | 1.6 |
| Net shares issued related to restricted stock awards | -1.8 | -2.3 | -1.7 | | | | | |
| Net proceeds from exercise of stock options | 2.4 | -0.8 | -0.3 | -1.0 | 2.5 | 1.7 | 1.1 | 3.0 |
| Net Cash (Used in) Provided by Financing Activities | -80.2 | 136.8 | 792.8 | -178.0 | 32.4 | 361.2 | 488.3 | 372.3 |
| |
| Supplemental Information: | | | | | | | | |
| Cash paid during the year for - Interest | 21.0 | 16.9 | 30.3 | 51.5 | 40.7 | 26.4 | 23.5 | 21.8 |
| Cash paid during the year for - Taxes | 23.9 | 28.6 | 22.9 | 16.7 | 16.9 | 31.0 | 24.7 | 22.7 |
| Transfer of loans to other real estate owned | 0.4 | 0.0 | 0.2 | | | | | |
| Right-of-use assets obtained in exchange for new lease liabilities | 2.5 | 2.3 | 1.3 | | | | | |