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Consolidated Statement of Changes in Stockholders' Equity and Changes in Net Assets - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Common Stock [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Capital in Excess of Par [Member] | Capital in Excess of Par [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Treasury Stock [Member] | Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Parent [Member] | Parent [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Noncontrolling Interest [Member] | Noncontrolling Interest [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Undistributed Net Investment Loss [Member] | Accumulated Undistributed Net Investment Loss [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Net Unrealized Appreciation on Investment Net of Tax [Member] | Net Unrealized Appreciation on Investment Net of Tax [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 287,159 |  | $ 273 |  | $ 273,716 |  | $ (24,919) |  |  |  |  |  | $ 287,159 |  |  |  |  |  |  |
Balance (Investment Company Accounting [Member]) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (65,592) |  | $ 103,681 |
Balance, shares at Dec. 31, 2017 |  |  |  | 27,294,327 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in net assets resulting from operations |  | (14,874) |  |  |  |  |  |  |  |  |  |  |  | (14,874) |  |  |  |  |  |  |
Net increase (decrease) in net assets resulting from operations | Investment Company Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (38,299) |  | 23,425 |
Stock-based compensation |  | 152 |  | $ 1 |  | 151 |  |  |  |  |  |  |  | 152 |  |  |  |  |  |  |
Issuance of restricted stock, net, shares |  |  |  | 95,726 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2018 |  | 272,437 | $ 299,502 | $ 274 | $ 274 | 273,867 | $ 273,867 | $ (24,919) | $ (24,919) |  | $ 23,215 | $ 23,215 |  | 272,437 | $ 272,437 |  | $ 27,065 |  |  |  |
Ending balance (Investment Company Accounting [Member]) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (103,891) | $ 103,891 | 127,106 | $ (127,106)
Ending balance, shares at Mar. 31, 2018 |  |  |  | 27,390,053 | 27,390,053 |  |  | (2,951,243) | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Type [Extensible List] |  |  |  |  |  |  |  |  |  |  | mfin:AdoptionOfBankHoldingCompanyAccountingMember |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Type [Extensible List] | Investment Company Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | mfin:AdoptionOfBankHoldingCompanyAccountingMember |  | mfin:AdoptionOfBankHoldingCompanyAccountingMember
Balance at Dec. 31, 2017 |  | 287,159 |  | $ 273 |  | 273,716 |  | $ (24,919) |  |  |  |  |  | 287,159 |  |  |  |  |  |  |
Balance (Investment Company Accounting [Member]) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (65,592) |  | 103,681 |
Balance, shares at Dec. 31, 2017 |  |  |  | 27,294,327 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [1] | (22,739) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | 290,204 |  | $ 274 |  | 274,292 |  | $ (24,919) |  | $ 13,043 |  |  | $ (82) | 262,608 |  | $ 27,596 |  |  |  |  |
Ending balance, shares at Dec. 31, 2018 |  |  |  | 27,385,600 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2018 |  | 272,437 | $ 299,502 | $ 274 | $ 274 | 273,867 | $ 273,867 | $ (24,919) | $ (24,919) |  | $ 23,215 | $ 23,215 |  | 272,437 | $ 272,437 |  | $ 27,065 |  |  |  |
Balance (Investment Company Accounting [Member]) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (103,891) | $ 103,891 | $ 127,106 | $ (127,106)
Balance, shares at Mar. 31, 2018 |  |  |  | 27,390,053 | 27,390,053 |  |  | (2,951,243) | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | (7,865) |  |  |  |  |  |  |  | (10,172) |  |  |  | (10,172) |  | 2,307 |  |  |  |  |
Distributions to non-controlling interest |  | (1,776) |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,776) |  |  |  |  |
Stock-based compensation |  | 425 |  |  |  | 425 |  |  |  |  |  |  |  | 425 |  |  |  |  |  |  |
Forfeiture of restricted stock, net, shares |  |  |  | (4,453) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gains (losses) on investments, net of tax |  | (82) |  |  |  |  |  |  |  |  |  |  | (82) | (82) |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 |  | 290,204 |  | $ 274 |  | 274,292 |  | $ (24,919) |  | 13,043 |  |  | (82) | 262,608 |  | 27,596 |  |  |  |  |
Ending balance, shares at Dec. 31, 2018 |  |  |  | 27,385,600 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 1,996 |  |  |  |  |  |  |  | (1,762) |  |  |  | (1,762) |  | 3,758 |  |  |  |  |
Non-controlling interest equity raised by Medallion Bank | [2] | 42,485 |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,485 |  |  |  |  |
Distributions to non-controlling interest |  | (2,519) |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,519) |  |  |  |  |
Stock-based compensation |  | 1,221 |  | $ 2 |  | 1,219 |  |  |  |  |  |  |  | 1,221 |  |  |  |  |  |  |
Issuance of restricted stock, net |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock, net, shares |  |  |  | 216,148 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted stock, net |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted stock, net, shares |  |  |  | (3,946) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gains (losses) on investments, net of tax |  | 1,081 |  |  |  |  |  |  |  |  |  |  | 1,081 | 1,081 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 |  | $ 334,468 |  | $ 276 |  | 275,511 |  | $ (24,919) |  | 11,281 |  |  | 999 | 263,148 |  | 71,320 |  |  |  |  |
Ending balance, shares at Dec. 31, 2019 |  | 24,646,559 |  | 27,597,802 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ (26,907) |  |  |  |  |  |  |  | (34,783) |  |  |  | (34,783) |  | 7,876 |  |  |  |  |
Distributions to non-controlling interest |  | (6,043) |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,043) |  |  |  |  |
Stock-based compensation |  | 2,030 |  | $ 2 |  | 2,028 |  |  |  |  |  |  |  | 2,030 |  |  |  |  |  |  |
Issuance of restricted stock, net |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock, net, shares |  |  |  | 229,408 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted stock, net |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture of restricted stock, net, shares |  |  |  | (8,755) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of restricted stock units, net, shares |  |  |  | 10,416 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change in unrealized gains (losses) on investments, net of tax |  | 1,013 |  |  |  |  |  |  |  |  |  |  | 1,013 | 1,013 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 |  | $ 304,561 |  | $ 278 |  | $ 277,539 |  | $ (24,919) |  | $ (23,502) |  |  | $ 2,012 | $ 231,408 |  | $ 73,153 |  |  |  |  |
Ending balance, shares at Dec. 31, 2020 |  | 24,877,628 |  | 27,828,871 |  |  |  | (2,951,243) |  |  |  |  |  |  |  |  |  |  |  |  |
[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] | Refer to Note 18 for details.

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