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Segment and Related Information - Schedule of Segment and Related Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | $ 63,445 | $ 66,093 | $ 126,644 | $ 131,021 |  |  |  |
Interest expense | 7,079 | 13,775 | 17,309 | 26,789 |  |  |  |
Net Interest Income | 56,366 | 52,318 | 109,335 | 104,232 |  |  |  |
Provision for credit loss expense | (348) | 601 | 15,946 | 1,046 |  |  |  |
Noninterest income | 17,177 | 18,520 | 36,137 | 37,927 |  |  |  |
Noninterest expense | 46,888 | 46,070 | 92,628 | 90,279 |  |  |  |
Income Before Income Tax Expense | 27,003 | 24,167 | 36,898 | 50,834 |  |  |  |
Income tax expense | 5,540 | 4,743 | 7,449 | 10,338 |  |  |  |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation | 21,463 | 19,424 | 29,449 | 40,496 |  |  |  |
Less: Net income attributable to noncontrolling interests | 32 | 32 | 69 | 64 |  |  |  |
Net Income Attributable to Tompkins Financial Corporation | 21,431 | 19,392 | 29,380 | 40,432 |  |  |  |
Depreciation and amortization | 2,551 | 2,466 | 5,105 | 4,946 |  |  |  |
Assets | 7,582,056 | 6,654,390 | 7,582,056 | 6,654,390 |  | $ 6,725,623 |  |
Goodwill | 92,447 | 92,447 | 92,447 | 92,447 |  | 92,447 |  |
Other intangibles, net | 5,500 | 7,092 | 5,500 | 7,092 |  | 6,223 |  |
Net loans and leases | 5,372,203 | 4,815,012 | 5,372,203 | 4,815,012 |  | 4,877,658 |  |
Deposits | 6,377,521 | 4,988,897 | 6,377,521 | 4,988,897 |  | 5,212,921 |  |
Total Equity | 698,029 | 657,677 | 698,029 | 657,677 | $ 682,597 | $ 663,054 | $ 647,267 | $ 620,871
Operating Segments | Banking |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 63,445 | 66,092 | 126,644 | 131,022 |  |  |  |
Interest expense | 7,080 | 13,775 | 17,311 | 26,791 |  |  |  |
Net Interest Income | 56,365 | 52,317 | 109,333 | 104,231 |  |  |  |
Provision for credit loss expense | (348) | 601 | 15,946 | 1,046 |  |  |  |
Noninterest income | 6,248 | 7,150 | 13,241 | 14,718 |  |  |  |
Noninterest expense | 37,709 | 37,067 | 74,399 | 72,395 |  |  |  |
Income Before Income Tax Expense | 25,252 | 21,799 | 32,229 | 45,508 |  |  |  |
Income tax expense | 5,113 | 4,148 | 6,269 | 8,982 |  |  |  |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation | 20,139 | 17,651 | 25,960 | 36,526 |  |  |  |
Less: Net income attributable to noncontrolling interests | 32 | 32 | 69 | 64 |  |  |  |
Net Income Attributable to Tompkins Financial Corporation | 20,107 | 17,619 | 25,891 | 36,462 |  |  |  |
Depreciation and amortization | 2,484 | 2,400 | 4,969 | 4,813 |  |  |  |
Assets | 7,528,501 | 6,602,541 | 7,528,501 | 6,602,541 |  |  |  |
Goodwill | 64,585 | 64,370 | 64,585 | 64,370 |  |  |  |
Other intangibles, net | 2,758 | 3,750 | 2,758 | 3,750 |  |  |  |
Net loans and leases | 5,372,203 | 4,815,012 | 5,372,203 | 4,815,012 |  |  |  |
Deposits | 6,391,034 | 5,001,210 | 6,391,034 | 5,001,210 |  |  |  |
Total Equity | 643,139 | 605,031 | 643,139 | 605,031 |  |  |  |
Operating Segments | Insurance |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 1 | 1 | 2 | 1 |  |  |  |
Interest expense | 0 | 0 | 0 | 0 |  |  |  |
Net Interest Income | 1 | 1 | 2 | 1 |  |  |  |
Provision for credit loss expense | 0 | 0 | 0 | 0 |  |  |  |
Noninterest income | 7,360 | 7,853 | 15,510 | 16,001 |  |  |  |
Noninterest expense | 6,358 | 6,331 | 12,920 | 12,607 |  |  |  |
Income Before Income Tax Expense | 1,003 | 1,523 | 2,592 | 3,395 |  |  |  |
Income tax expense | 260 | 401 | 691 | 891 |  |  |  |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation | 743 | 1,122 | 1,901 | 2,504 |  |  |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |  |  |
Net Income Attributable to Tompkins Financial Corporation | 743 | 1,122 | 1,901 | 2,504 |  |  |  |
Depreciation and amortization | 57 | 56 | 116 | 112 |  |  |  |
Assets | 42,215 | 42,163 | 42,215 | 42,163 |  |  |  |
Goodwill | 19,866 | 19,866 | 19,866 | 19,866 |  |  |  |
Other intangibles, net | 2,623 | 3,162 | 2,623 | 3,162 |  |  |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |  |  |
Deposits | 0 | 0 | 0 | 0 |  |  |  |
Total Equity | 31,567 | 32,293 | 31,567 | 32,293 |  |  |  |
Operating Segments | Wealth Management |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | 0 | 0 | 0 | 0 |  |  |  |
Interest expense | 0 | 0 | 0 | 0 |  |  |  |
Net Interest Income | 0 | 0 | 0 | 0 |  |  |  |
Provision for credit loss expense | 0 | 0 | 0 | 0 |  |  |  |
Noninterest income | 4,095 | 4,059 | 8,469 | 8,257 |  |  |  |
Noninterest expense | 3,347 | 3,214 | 6,392 | 6,326 |  |  |  |
Income Before Income Tax Expense | 748 | 845 | 2,077 | 1,931 |  |  |  |
Income tax expense | 167 | 194 | 489 | 465 |  |  |  |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation | 581 | 651 | 1,588 | 1,466 |  |  |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |  |  |
Net Income Attributable to Tompkins Financial Corporation | 581 | 651 | 1,588 | 1,466 |  |  |  |
Depreciation and amortization | 10 | 10 | 20 | 21 |  |  |  |
Assets | 25,474 | 22,541 | 25,474 | 22,541 |  |  |  |
Goodwill | 7,996 | 8,211 | 7,996 | 8,211 |  |  |  |
Other intangibles, net | 119 | 180 | 119 | 180 |  |  |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |  |  |
Deposits | 0 | 0 | 0 | 0 |  |  |  |
Total Equity | 23,323 | 20,353 | 23,323 | 20,353 |  |  |  |
Intercompany |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Interest income | (1) | 0 | (2) | (2) |  |  |  |
Interest expense | (1) | 0 | (2) | (2) |  |  |  |
Net Interest Income | 0 | 0 | 0 | 0 |  |  |  |
Provision for credit loss expense | 0 | 0 | 0 | 0 |  |  |  |
Noninterest income | (526) | (542) | (1,083) | (1,049) |  |  |  |
Noninterest expense | (526) | (542) | (1,083) | (1,049) |  |  |  |
Income Before Income Tax Expense | 0 | 0 | 0 | 0 |  |  |  |
Income tax expense | 0 | 0 | 0 | 0 |  |  |  |
Net Income Attributable to Noncontrolling Interests and Tompkins Financial Corporation | 0 | 0 | 0 | 0 |  |  |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |  |  |
Net Income Attributable to Tompkins Financial Corporation | 0 | 0 | 0 | 0 |  |  |  |
Depreciation and amortization | 0 | 0 | 0 | 0 |  |  |  |
Assets | (14,134) | (12,855) | (14,134) | (12,855) |  |  |  |
Goodwill | 0 | 0 | 0 | 0 |  |  |  |
Other intangibles, net | 0 | 0 | 0 | 0 |  |  |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |  |  |
Deposits | (13,513) | (12,313) | (13,513) | (12,313) |  |  |  |
Total Equity | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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