| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| OPERATING ACTIVITIES | | | | | | | | |
| Net income attributable to Tompkins Financial Corporation | 68.7 | 81.1 | 85.0 | 84.9 | 84.9 | 86.9 | 89.3 | 69.8 |
| Depreciation and amortization of premises, equipment, and software | 10.9 | 10.7 | 10.7 | 10.5 | 10.4 | 10.4 | 10.3 | 7.7 |
| Amortization of intangible assets | 0.6 | 0.7 | 0.9 | 1.0 | 1.1 | 1.2 | 1.3 | 1.0 |
| Earnings from corporate owned life insurance | -1.7 | -1.4 | -1.2 | -0.8 | -1.4 | -1.8 | -1.9 | -1.5 |
| Net amortization on securities | 4.2 | 4.7 | 5.6 | 6.9 | 8.2 | 10.1 | 11.8 | 9.4 |
| Amortization/accretion related to purchase accounting | -0.8 | -0.9 | -0.9 | -2.8 | -1.6 | -0.8 | -0.9 | |
| Net loss on securities transactions | 7.6 | 0.6 | 0.6 | 0.2 | 0.2 | 0.1 | -0.2 | -0.3 |
| Net gain on sale of loans originated for sale | -0.2 | -0.2 | -0.2 | -0.2 | -0.4 | -0.5 | -0.9 | -0.9 |
| Proceeds from sale of loans originated for sale | 10.8 | 10.2 | 9.0 | 11.3 | 15.4 | 21.7 | 32.5 | 28.6 |
| Loans originated for sale | -10.0 | -9.4 | -8.7 | -11.1 | -13.3 | -21.6 | -27.4 | -23.4 |
| Net gain on sale of bank premises and equipment | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | 0.0 | 0.0 | |
| Net excess tax benefit from stock based compensation | 0.3 | 0.4 | 0.4 | 0.3 | 0.4 | 0.5 | 0.6 | 0.3 |
| Stock-based compensation expense | 4.5 | 4.4 | 4.3 | 4.4 | 4.7 | 4.9 | 5.1 | 3.8 |
| Decrease in accrued interest receivable | 1.1 | 0.8 | 0.5 | -9.0 | -5.1 | -0.8 | -0.8 | 8.7 |
| Increase (decrease) in accrued interest payable | -1.4 | -2.1 | -2.3 | 10.2 | 9.7 | 9.9 | 9.4 | -0.8 |
| Other, net | -2.7 | -0.9 | -4.2 | -2.6 | -0.5 | -11.1 | -11.2 | -9.2 |
| Net Cash Provided by Operating Activities | 96.6 | 102.2 | 103.3 | 112.1 | 122.2 | 114.8 | 121.2 | 91.4 |
| |
| INVESTING ACTIVITIES | | | | | | | | |
| Proceeds from maturities, calls and principal paydowns of available-for-sale debt securities | 153.0 | 164.5 | 208.7 | 255.4 | 330.6 | 496.8 | 453.7 | 377.6 |
| Proceeds from sales of available-for-sale debt securities | 234.5 | | 160.6 | 24.6 | | | | 142.7 |
| Purchases of available-for-sale debt securities | -23.7 | -30.4 | -154.8 | -224.6 | -508.3 | -683.0 | -1,071.8 | -1,002.0 |
| Purchases of held-to-maturity securities | | | | | -160.5 | -303.5 | -284.0 | -269.2 |
| Net increase in loans | -193.0 | -208.9 | -193.0 | -117.4 | 5.1 | 224.0 | 175.2 | 160.5 |
| Proceeds from sale/redemptions of Federal Home Loan Bank stock | 111.0 | 94.2 | 81.4 | 57.2 | 30.8 | 21.9 | | |
| Purchases of Federal Home Loan Bank and other stock | -116.7 | -106.4 | -88.1 | -55.9 | -32.7 | -12.7 | -3.8 | |
| Proceeds from sale of bank premises and equipment | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | |
| Purchases of bank premises, equipment and software | -6.7 | -9.5 | -8.2 | -7.6 | -7.6 | -4.0 | -4.7 | -3.3 |
| Other, net | | -0.6 | -0.4 | | -0.2 | | 0.0 | |
| Net Cash Provided by (Used in) Investing Activities | 171.6 | 68.5 | -8.4 | -111.5 | -238.8 | -250.0 | -583.3 | -587.4 |
| |
| FINANCING ACTIVITIES | | | | | | | | |
| Net (decrease) increase in demand, money market, and savings deposits | -467.7 | -594.2 | -158.0 | | 22.9 | | | |
| Increase in other borrowings | 345.4 | 520.9 | 435.9 | | 235.6 | | | |
| Repayment of other borrowings | | -253.9 | -268.6 | -258.6 | | -221.9 | | -157.9 |
| Repurchase of common stock | -7.7 | | | -18.0 | -29.9 | -32.6 | -23.8 | -21.2 |
| Shares issued for employee stock ownership plan | | | | | | 3.0 | | |
| Net shares issued related to restricted stock awards | -1.9 | -1.8 | -1.8 | -2.3 | -2.3 | -2.3 | -2.3 | |
| Net proceeds from exercise of stock options | -0.6 | -0.6 | 2.4 | 2.8 | | 2.3 | -0.8 | -0.7 |
| Net Cash (Used in) Provided by Financing Activities | -267.0 | -275.2 | -80.2 | -230.6 | -94.0 | -208.2 | 136.8 | 441.0 |
| |
| Supplemental Information: | | | | | | | | |
| Cash paid during the year for - Interest | 50.0 | 33.2 | 21.0 | 12.2 | 12.2 | 14.7 | 16.9 | 15.9 |
| Cash paid during the year for - Taxes | 21.0 | 23.8 | 23.9 | 22.8 | 20.2 | 29.1 | 28.6 | 23.4 |
| Transfer of loans to other real estate owned | | | 0.4 | 0.3 | 0.1 | 0.1 | | |
| Right-of-use assets obtained in exchange for new lease liabilities | 2.4 | 2.4 | 2.5 | 3.6 | 2.8 | 2.8 | 2.3 | |