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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2019 | Mar. 31, 2019 | Apr. 02, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-bearing funds deposited in other banks |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Non-marketable securities |  |  |  | 9,746,000 | $ 10,079,000 |  |  |  |  |  |  |  |
Net premium on investment securities | [1] |  |  |  |  | $ 3,287,000 |  |  |  |  |  |  |
Investment securities Amortized to interest income |  | $ 21,000 | $ 80,000 | 291,000 | 79,000 |  |  |  |  |  |  |  |
Net loan origination costs |  |  |  | 20,684,000 | 17,839,000 |  |  |  |  |  |  |  |
Net amortization to income |  |  |  | 6,021,000 | 4,952,000 | 3,128,000 |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  | $ 40,541,000 | 60,413,000 |  |  |  |  |  |  |  |
Percentage of write down of loan balance |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Loans pledged as collateral |  |  |  | $ 15,367,000 | 28,833,000 |  |  |  |  |  |  |  |
Principal portion of loans serviced, fair value |  |  |  | 107,131,000 | 113,581,000 |  |  |  |  |  |  |  |
Loans write down to collateral value |  |  |  | $ 75,844,000 | 49,961,000 |  |  |  |  |  |  |  |
Intangible assets useful life |  |  |  | 20 years |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 150,803,000 | 150,803,000 |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  | 51,090,000 | 52,536,000 |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  | 1,445,000 | 1,446,000 | 1,083,000 | [1] |  |  |  |  |  |
Financing receivable, recorded investment, 90 days past due and still accruing |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | 412,000 | 418,000 | 422,000 |  |  |  |  |  |  |
Amortization expense |  |  |  | 2,558,000 | 2,348,000 | $ 1,864,000 |  |  |  |  |  |  |
Deferred costs |  |  |  | $ 5,805,000 | $ 5,105,000 |  |  |  |  |  |  |  |
Potential dilutive common shares excluded from EPS computation |  |  |  | 934,003 | 462,180 | 100,000 |  |  |  |  |  |  |
Stock based compensation award |  |  |  | 444,557 | 449,450 | 39,000 |  |  |  |  |  |  |
Stock based compensation award, Amount |  |  |  | $ 2,030,000 | $ 1,221,000 | $ 576,000 |  |  |  |  |  |  |
Stock based compensation award per diluted common share |  |  |  | $ 0.08 | $ 0.05 | $ 0.02 |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested stock options and restricted stock |  |  |  | $ 2,405,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to unvested stock options and restricted stock, recognition period |  |  |  | 48 months |  |  |  |  |  |  |  |  |
Tier 1 leverage capital ratio |  |  |  | 16.93% |  |  |  |  |  |  |  |  |
Capital conversation buffer |  |  |  |  | 2.50% | 2.50% |  |  |  |  |  |  |
Restricted Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation award |  |  |  | 229,408 | 216,148 | 101,010 |  |  |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation award |  |  |  | 47,156 | 26,040 | 0 |  |  |  |  |  |  |
Medallion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  | $ 4,282,000 | $ 17,181,000 |  |  |  |  |  |  |  |
Loans write down to collateral value |  |  |  | 49,361,000 | 22,205,000 |  |  |  |  |  |  |  |
Financing receivable, recorded investment, 90 days past due and still accruing |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
New York City [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loans write down to collateral value |  |  |  | 79,500,000 |  |  |  |  |  |  |  |  |
New York City [Member] | Medallion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loans write down to collateral value |  |  |  | 46,087,000 |  |  |  |  |  |  |  |  |
91+ [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  | 6,878,000 | 8,663,000 |  |  |  |  |  |  |  |
91+ [Member] | Medallion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  | 1,290,000 | 2,572,000 |  |  |  |  |  |  |  |
91+ [Member] | Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  | $ 6,878,000 | $ 8,663,000 |  |  |  |  |  |  |  |
Total loans more than 90 days past due ,percentage |  |  |  | 0.57% | 0.76% |  |  |  |  |  |  |  |
Medallion Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Appreciation in Investment in Medallion Bank |  | $ 39,826,000 |  |  |  |  |  |  |  |  | $ 7,849,000 | $ 128,918,000 | $ 15,500,000
Net amortization to income |  |  |  |  |  | $ 3,993,000 |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |
RPAC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Premiums in loan portfolio |  |  |  |  |  |  |  |  |  | $ 12,387,000 |  |  |
Financing receivable, recorded investment, 90 days past due and still accruing |  |  |  | 2,717,000 | 5,758,000 |  |  |  |  |  |  |  |
Loan portfolio premium amortized to interest income |  |  |  | 3,041,000 | 3,289,000 | $ 3,339,000 |  |  |  |  |  |  |
Bank Holding Company Accounting [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net premium on investment securities |  |  |  | $ 278,000 | $ 248,000 |  |  |  |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reserve |  |  |  |  |  |  |  | $ 2,970,000 | $ 2,970,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing loan term |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Estimated useful life of fixed assets |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Tier 1 leverage capital to total assets ratio |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest bearing loan term |  |  |  | 7 years |  |  |  |  |  |  |  |  |
Estimated useful life of fixed assets |  |  |  | 10 years |  |  |  |  |  |  |  |  |
[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.

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