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Parent Company Only Condensed Financial Statements - Condensed Statements of Operations (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Interest expense | [1] |  |  |  | $ 3,551 |
Net interest income/net investment income |  | $ 71,987 | $ 110,811 | $ 97,517 | 72,469 | [1]
Provision for loan losses |  | 59,008 | 69,817 | 47,386 | 59,008 | [1]
Net interest income after provision for loan losses |  | 12,979 | 40,994 | 50,131 | 13,461 | [1]
Income (loss) before income taxes/net investment loss before taxes |  | (7,156) | (36,981) | 2,337 | (10,722) | [1],[2]
Income tax benefit | [1] |  |  |  | 8,426 |
Total net income (loss) attributable to Medallion Financial Corp./net increase (decrease) on net assets resulting from operations | [1] |  |  |  | $ (25,046) |
Parent Company [Member] |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |
Interest income |  | (1,958) | (2,824) | (2,552) |  |
Interest expense |  | 5,480 | 8,602 | 8,856 |  |
Net interest income/net investment income |  | (7,438) | (11,426) | (11,408) |  |
Provision for loan losses |  | 19,190 | 5,127 | 6,377 |  |
Net interest income after provision for loan losses |  | (26,628) | (16,553) | (17,785) |  |
Other income (expense), net |  | (16,913) | (22,062) | (13,686) |  |
Income (loss) before income taxes/net investment loss before taxes |  | (43,541) | (38,615) | (31,471) |  |
Income tax benefit |  | 5,328 | 10,454 | 7,013 |  |
Total net income (loss) attributable to Medallion Financial Corp./net increase (decrease) on net assets resulting from operations |  | (38,213) | (28,161) | (24,458) |  |
Undistributed earnings (losses) of subsidiaries |  | 28,041 | (6,622) | 22,696 |  |
Net income (loss) attributable to parent company |  | $ (10,172) | $ (34,783) | $ (1,762) |  |
[1] | Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.
[2] | Includes $256 of net revenues received from Medallion Bank for the year ended December 31, 2018, primarily for expense reimbursements. See Notes 5 and 12 for additional information.

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