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Segment and Related Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | $ 62,143 | $ 56,342 | $ 122,283 | $ 109,963 |  |
Interest expense | 9,429 | 6,041 | 16,882 | 11,628 |  |
Net Interest Income | 52,714 | 50,301 | 105,401 | 98,335 |  |
Provision for loan and lease losses | 1,045 | 976 | 1,612 | 1,745 |  |
Noninterest income | 21,158 | 17,450 | 38,988 | 34,690 |  |
Noninterest expense | 44,985 | 41,568 | 88,706 | 82,936 |  |
Income Before Income Tax Expense | 27,842 | 25,207 | 54,071 | 48,344 |  |
Income tax expense | 5,751 | 8,248 | 11,512 | 15,637 |  |
Net Income attributable to Noncontrolling Interests and Tompkins Financial Corporation | 22,091 | 16,959 | 42,559 | 32,707 |  |
Less: Net income attributable to noncontrolling interests | 32 | 33 | 64 | 65 |  |
Net Income Attributable to Tompkins Financial Corporation | 22,059 | 16,926 | 42,495 | 32,642 |  |
Depreciation and amortization | 2,145 | 1,854 | 4,618 | 3,641 |  |
Assets | 6,745,800 | 6,415,012 | 6,745,800 | 6,415,012 | $ 6,648,290 |
Goodwill | 92,283 | 92,291 | 92,283 | 92,291 | 92,291 |
Other intangibles, net | 8,342 | 10,251 | 8,342 | 10,251 | 9,263 |
Net loans and leases | 4,749,968 | 4,381,439 | 4,749,968 | 4,381,439 | 4,629,349 |
Deposits | 4,792,229 | 4,750,722 | 4,792,229 | 4,750,722 | 4,837,807 |
Total Equity | 590,649 | 576,915 | 590,649 | 576,915 | $ 576,202 | $ 549,405
Operating Segments | Banking |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 62,143 | 56,342 | 122,283 | 109,963 |  |
Interest expense | 9,430 | 6,041 | 16,883 | 11,628 |  |
Net Interest Income | 52,713 | 50,301 | 105,400 | 98,335 |  |
Provision for loan and lease losses | 1,045 | 976 | 1,612 | 1,745 |  |
Noninterest income | 9,943 | 6,720 | 16,354 | 13,123 |  |
Noninterest expense | 36,287 | 32,819 | 71,044 | 65,306 |  |
Income Before Income Tax Expense | 25,324 | 23,226 | 49,098 | 44,407 |  |
Income tax expense | 5,173 | 7,510 | 10,303 | 14,182 |  |
Net Income attributable to Noncontrolling Interests and Tompkins Financial Corporation | 20,151 | 15,716 | 38,795 | 30,225 |  |
Less: Net income attributable to noncontrolling interests | 32 | 33 | 64 | 65 |  |
Net Income Attributable to Tompkins Financial Corporation | 20,119 | 15,683 | 38,731 | 30,160 |  |
Depreciation and amortization | 2,075 | 1,766 | 4,475 | 3,456 |  |
Assets | 6,695,931 | 6,368,374 | 6,695,931 | 6,368,374 |  |
Goodwill | 64,370 | 64,370 | 64,370 | 64,370 |  |
Other intangibles, net | 4,595 | 5,783 | 4,595 | 5,783 |  |
Net loans and leases | 4,749,968 | 4,381,439 | 4,749,968 | 4,381,439 |  |
Deposits | 4,803,044 | 4,761,017 | 4,803,044 | 4,761,017 |  |
Total Equity | 541,373 | 532,291 | 541,373 | 532,291 |  |
Operating Segments | Insurance |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 1 | 0 | 1 | 1 |  |
Interest expense | 0 | 0 | 0 | 0 |  |
Net Interest Income | 1 | 0 | 1 | 1 |  |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |  |
Noninterest income | 7,488 | 7,132 | 14,976 | 14,448 |  |
Noninterest expense | 6,282 | 6,059 | 12,521 | 12,139 |  |
Income Before Income Tax Expense | 1,207 | 1,073 | 2,456 | 2,310 |  |
Income tax expense | 274 | 428 | 624 | 903 |  |
Net Income attributable to Noncontrolling Interests and Tompkins Financial Corporation | 933 | 645 | 1,832 | 1,407 |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |
Net Income Attributable to Tompkins Financial Corporation | 933 | 645 | 1,832 | 1,407 |  |
Depreciation and amortization | 57 | 74 | 118 | 156 |  |
Assets | 41,304 | 41,438 | 41,304 | 41,438 |  |
Goodwill | 19,702 | 19,710 | 19,702 | 19,710 |  |
Other intangibles, net | 3,500 | 4,151 | 3,500 | 4,151 |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |
Deposits | 0 | 0 | 0 | 0 |  |
Total Equity | 32,611 | 31,379 | 32,611 | 31,379 |  |
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 loan and lease losses | 0 | 0 | 0 | 0 |  |
Noninterest income | 4,207 | 4,015 | 8,615 | 7,925 |  |
Noninterest expense | 2,896 | 3,107 | 6,098 | 6,297 |  |
Income Before Income Tax Expense | 1,311 | 908 | 2,517 | 1,628 |  |
Income tax expense | 304 | 310 | 585 | 552 |  |
Net Income attributable to Noncontrolling Interests and Tompkins Financial Corporation | 1,007 | 598 | 1,932 | 1,076 |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |
Net Income Attributable to Tompkins Financial Corporation | 1,007 | 598 | 1,932 | 1,076 |  |
Depreciation and amortization | 13 | 14 | 25 | 29 |  |
Assets | 18,815 | 15,692 | 18,815 | 15,692 |  |
Goodwill | 8,211 | 8,211 | 8,211 | 8,211 |  |
Other intangibles, net | 247 | 317 | 247 | 317 |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |
Deposits | 0 | 0 | 0 | 0 |  |
Total Equity | 16,665 | 13,245 | 16,665 | 13,245 |  |
Intercompany |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | (1) | 0 | (1) | (1) |  |
Interest expense | (1) | 0 | (1) | 0 |  |
Net Interest Income | 0 | 0 | 0 | (1) |  |
Provision for loan and lease losses | 0 | 0 | 0 | 0 |  |
Noninterest income | (480) | (417) | (957) | (806) |  |
Noninterest expense | (480) | (417) | (957) | (806) |  |
Income Before Income Tax Expense | 0 | 0 | 0 | (1) |  |
Income tax expense | 0 | 0 | 0 | 0 |  |
Net Income attributable to Noncontrolling Interests and Tompkins Financial Corporation | 0 | 0 | 0 | (1) |  |
Less: Net income attributable to noncontrolling interests | 0 | 0 | 0 | 0 |  |
Net Income Attributable to Tompkins Financial Corporation | 0 | 0 | 0 | (1) |  |
Depreciation and amortization | 0 | 0 | 0 | 0 |  |
Assets | (10,250) | (10,492) | (10,250) | (10,492) |  |
Goodwill | 0 | 0 | 0 | 0 |  |
Other intangibles, net | 0 | 0 | 0 | 0 |  |
Net loans and leases | 0 | 0 | 0 | 0 |  |
Deposits | (10,815) | (10,295) | (10,815) | (10,295) |  |
Total Equity | $ 0 | $ 0 | $ 0 | $ 0 |  |

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