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Segment and Related Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 65,325 | $ 63,984 | $ 62,143 | $ 60,140 | $ 59,029 | $ 57,772 | $ 56,342 | $ 53,621 | $ 251,592 | $ 226,764 | $ 202,739 |
Interest expense | 12,089 | 10,821 | 9,429 | 7,453 | 7,060 | 6,772 | 6,041 | 5,587 | 39,792 | 25,460 | 22,103 |
Net Interest Income | 53,236 | 53,163 | 52,714 | 52,687 | 51,969 | 51,000 | 50,301 | 48,034 | 211,800 | 201,304 | 180,636 |
Provision for loan and lease losses | 2,058 | 272 | 1,045 | 567 | 2,014 | 402 | 976 | 769 | 3,942 | 4,161 | 4,321 |
Noninterest income |  |  |  |  |  |  |  |  | 77,449 | 69,204 | 68,808 |
Noninterest expense |  |  |  |  |  |  |  |  | 181,067 | 171,105 | 158,607 |
Income Before Income Tax Expense | 23,808 | 26,361 | 27,842 | 26,229 | 20,981 | 25,917 | 25,207 | 23,137 | 104,240 | 95,242 | 86,516 |
Income Tax Expense |  |  |  |  |  |  |  |  | 21,805 | 42,620 | 27,045 |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 82,435 | 52,622 | 59,471 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 127 | 128 | 131 |
Net Income Attributable to Tompkins Financial Corporation | 18,911 | $ 20,902 | $ 22,059 | $ 20,436 | 2,457 | $ 17,394 | $ 16,926 | $ 15,717 | 82,308 | 52,494 | 59,340 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,554 | 8,269 | 6,829 |
Assets | 6,758,436 |  |  |  | 6,648,290 |  |  |  | 6,758,436 | 6,648,290 | 6,236,756 |
Goodwill | 92,283 |  |  |  | 92,291 |  |  |  | 92,283 | 92,291 | 92,623 |
Other intangibles, net | 7,628 |  |  |  | 9,263 |  |  |  | 7,628 | 9,263 | 11,349 |
Net loans and leases | 4,790,529 |  |  |  | 4,629,349 |  |  |  | 4,790,529 | 4,629,349 | 4,222,278 |
Deposits | 4,888,959 |  |  |  | 4,837,807 |  |  |  | 4,888,959 | 4,837,807 | 4,625,139 |
Total equity | 620,871 |  |  |  | 576,202 |  |  |  | 620,871 | 576,202 | 549,405 | $ 516,466
Banking |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 64,369 |  |  |  | 64,369 |  |  |  | 64,369 | 64,369 | 64,369 |
Insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 19,703 |  |  |  | 19,711 |  |  |  | 19,703 | 19,711 | 20,043 |
Wealth Management |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 8,211 |  |  |  | 8,211 |  |  |  | 8,211 | 8,211 | 8,211 |
Operating Segments | Banking |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 251,592 | 226,764 | 202,739 |
Interest expense |  |  |  |  |  |  |  |  | 39,795 | 25,462 | 22,105 |
Net Interest Income |  |  |  |  |  |  |  |  | 211,797 | 201,302 | 180,634 |
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 3,942 | 4,161 | 4,321 |
Noninterest income |  |  |  |  |  |  |  |  | 31,738 | 25,498 | 24,402 |
Noninterest expense |  |  |  |  |  |  |  |  | 145,070 | 135,750 | 123,004 |
Income Before Income Tax Expense |  |  |  |  |  |  |  |  | 94,523 | 86,889 | 77,711 |
Income Tax Expense |  |  |  |  |  |  |  |  | 19,486 | 39,731 | 23,928 |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 75,037 | 47,158 | 53,783 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 127 | 128 | 131 |
Net Income Attributable to Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 74,910 | 47,030 | 53,652 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,194 | 7,927 | 6,401 |
Assets | 6,707,625 |  |  |  | 6,602,242 |  |  |  | 6,707,625 | 6,602,242 | 6,190,824 |
Goodwill | 64,370 |  |  |  | 64,369 |  |  |  | 64,370 | 64,369 | 64,369 |
Other intangibles, net | 4,224 |  |  |  | 5,170 |  |  |  | 4,224 | 5,170 | 6,433 |
Net loans and leases | 4,790,529 |  |  |  | 4,629,349 |  |  |  | 4,790,529 | 4,629,349 | 4,222,278 |
Deposits | 4,900,464 |  |  |  | 4,848,654 |  |  |  | 4,900,464 | 4,848,654 | 4,633,527 |
Total equity | 568,988 |  |  |  | 530,386 |  |  |  | 568,988 | 530,386 | 506,411 |
Operating Segments | Insurance |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 3 | 2 | 2 |
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net Interest Income |  |  |  |  |  |  |  |  | 3 | 2 | 2 |
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Noninterest income |  |  |  |  |  |  |  |  | 29,760 | 29,106 | 29,741 |
Noninterest expense |  |  |  |  |  |  |  |  | 25,427 | 24,503 | 24,564 |
Income Before Income Tax Expense |  |  |  |  |  |  |  |  | 4,336 | 4,605 | 5,179 |
Income Tax Expense |  |  |  |  |  |  |  |  | 1,092 | 1,705 | 1,906 |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 3,244 | 2,900 | 3,273 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net Income Attributable to Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 3,244 | 2,900 | 3,273 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 230 | 285 | 353 |
Assets | 42,088 |  |  |  | 39,599 |  |  |  | 42,088 | 39,599 | 38,988 |
Goodwill | 19,702 |  |  |  | 19,711 |  |  |  | 19,702 | 19,711 | 20,043 |
Other intangibles, net | 3,192 |  |  |  | 3,812 |  |  |  | 3,192 | 3,812 | 4,560 |
Net loans and leases | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Deposits | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Total equity | 32,996 |  |  |  | 31,083 |  |  |  | 32,996 | 31,083 | 30,825 |
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 for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Noninterest income |  |  |  |  |  |  |  |  | 17,997 | 16,345 | 15,842 |
Noninterest expense |  |  |  |  |  |  |  |  | 12,616 | 12,597 | 12,216 |
Income Before Income Tax Expense |  |  |  |  |  |  |  |  | 5,381 | 3,748 | 3,626 |
Income Tax Expense |  |  |  |  |  |  |  |  | 1,227 | 1,184 | 1,211 |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 4,154 | 2,564 | 2,415 |
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Net Income Attributable to Tompkins Financial Corporation |  |  |  |  |  |  |  |  | 4,154 | 2,564 | 2,415 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 130 | 57 | 75 |
Assets | 21,365 |  |  |  | 17,779 |  |  |  | 21,365 | 17,779 | 15,403 |
Goodwill | 8,211 |  |  |  | 8,211 |  |  |  | 8,211 | 8,211 | 8,211 |
Other intangibles, net | 212 |  |  |  | 281 |  |  |  | 212 | 281 | 356 |
Net loans and leases | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Deposits | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Total equity | 18,887 |  |  |  | 14,733 |  |  |  | 18,887 | 14,733 | 12,169 |
Intercompany |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | (3) | (2) | (2) |
Interest expense |  |  |  |  |  |  |  |  | (3) | (2) | (2) |
Net Interest Income |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Provision for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Noninterest income |  |  |  |  |  |  |  |  | (2,046) | (1,745) | (1,177) |
Noninterest expense |  |  |  |  |  |  |  |  | (2,046) | (1,745) | (1,177) |
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 | (12,642) |  |  |  | (11,330) |  |  |  | (12,642) | (11,330) | (8,459) |
Goodwill | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Other intangibles, net | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Net loans and leases | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Deposits | (11,505) |  |  |  | (10,847) |  |  |  | (11,505) | (10,847) | (8,388) |
Total equity | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0 |

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