v3.26.1
Segment Reporting - Schedule of Segment Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting Disclosure [Line Items]              
Total interest income $ 84,377   $ 77,442   $ 163,445 $ 152,867  
Total interest expense 27,130   24,072   52,139 48,085  
Net interest income 57,247   53,370   111,306 104,782  
Provision (benefit) for credit losses 22,273 $ 22,476 21,562 $ 22,014 44,749 43,576  
Net interest income after provision for credit losses 34,974   31,808   66,557 61,206  
Other income, net 4,476   9,209   6,884 20,808  
Other expenses              
Salaries 11,247   10,148   22,247 20,141  
Loan servicing fees and collection costs 6,297   4,932   11,771 9,488  
Other costs 7,409   6,465   13,309 12,674  
Total other expenses 24,953   21,545   47,327 42,303  
Operating expenses           42,303  
Net income (loss) before taxes 14,497   19,472   26,114 39,711  
Income tax (provision) benefit (4,717)   (5,805)   (9,045) (12,518)  
Net income (loss) 9,780 $ 7,289 13,667 $ 13,526 17,069 27,193  
Income attributable to the non-controlling interest 2,335   2,598   4,671 4,110  
Net income attributable to Medallion Financial Corp. 7,445   11,069   12,398 23,083  
Balance Sheet Data              
Total loans, gross 2,650,665       2,650,665   $ 2,436,916
Loans 2,794,742 [1]   2,485,051   2,794,742 [1] 2,485,051 2,566,849
Total assets 3,193,585   2,879,994   3,193,585 2,879,994 $ 2,955,464
Total funds borrowed $ 2,646,138 [2]   $ 2,304,317 [3]   $ 2,646,138 [2] $ 2,304,317 [3]  
Selected Financial Ratios              
Return on average assets 1.28%   1.93%   1.14% 1.93%  
Return on average stockholders' equity 7.31%   11.49%   6.11% 12.21%  
Return on average equity 7.71%   11.13%   6.76% 11.63%  
Interest yield 11.71%   11.75%   11.67% 11.70%  
Net interest margin, gross 7.94%   8.09%   7.94% 8.01%  
Net interest margin, net of allowance 8.28%   8.42%   8.29% 8.33%  
Reserve coverage 4.42% [4]   4.43% [5]   4.42% [6] 4.43% [7]  
Delinquency status 0.89% [8]   1.19% [9]   0.89% [10] 1.19% [11]  
Charge-off (recovery) ratio 2.43% [12]   2.44% [13]   2.82% [14] 2.77% [15]  
Recreation [Member]              
Selected Financial Ratios              
Charge-off (recovery) ratio     3.25%     3.94%  
Operating Segments [Member] | Consumer Lending [Member] | Recreation [Member]              
Segment Reporting Disclosure [Line Items]              
Total interest income $ 57,101   $ 51,101   $ 111,135 $ 101,567  
Total interest expense 15,865   12,854   30,157 24,895  
Net interest income 41,236   38,247   80,978 76,672  
Provision (benefit) for credit losses 17,501   15,336   35,946 32,206  
Net interest income after provision for credit losses 23,735   22,911   45,032 44,466  
Other income, net 1,417   1,366   1,443 1,766  
Other expenses              
Salaries 4,073   3,008   8,178 6,650  
Loan servicing fees and collection costs 4,951   4,056   9,241 7,238  
Other costs 3,264   2,972   5,947 6,112  
Total other expenses 12,288   10,036   23,366    
Operating expenses           20,000  
Net income (loss) before taxes 12,864   14,241   23,109 26,232  
Income tax (provision) benefit (4,187)   (4,292)   (8,004) (8,269)  
Net income (loss) 8,677   9,949   15,105 17,963  
Balance Sheet Data              
Total loans, gross 1,760,297 [1]   1,546,252   1,760,297 [1] 1,546,252  
Total assets 1,693,668   1,493,721   1,693,668 1,493,721  
Total funds borrowed $ 1,403,338 [2]   $ 1,195,144 [3]   $ 1,403,338 [2] $ 1,195,144 [3]  
Selected Financial Ratios              
Return on average assets 2.11%   2.67%   1.88% 2.42%  
Return on average equity 12.79%   15.59%   11.26% 14.25%  
Interest yield 13.45%   13.39%   13.43% 13.34%  
Net interest margin, gross 9.71%   10.02%   9.78% 10.07%  
Net interest margin, net of allowance 10.24%   10.53%   10.32% 10.57%  
Reserve coverage 5.16% [4]   5.05% [5]   5.16% [6] 5.05% [7]  
Delinquency status 0.57% [8]   0.49% [9]   0.57% [10] 0.49% [11]  
Charge-off (recovery) ratio 3.14% [12]   3.11% [13]   3.75% [14] 3.71% [15]  
Operating Segments [Member] | Consumer Lending [Member] | Home Improvement [Member]              
Segment Reporting Disclosure [Line Items]              
Total interest income $ 20,929   $ 20,133   $ 40,305 $ 39,904  
Total interest expense 7,273   7,325   14,643 14,289  
Net interest income 13,656   12,808   25,662 25,615  
Provision (benefit) for credit losses 4,066   3,934   7,684 6,779  
Net interest income after provision for credit losses 9,590   8,874   17,978 18,836  
Other income, net 3   3   10 5  
Other expenses              
Salaries 2,112   1,976   4,464 4,353  
Loan servicing fees and collection costs 1,269   1,193   2,410 1,970  
Other costs 1,598   1,541   2,976 3,371  
Total other expenses 4,979   4,710   9,850    
Operating expenses           9,694  
Net income (loss) before taxes 4,614   4,167   8,138 9,147  
Income tax (provision) benefit (1,506)   (1,232)   (2,819) (2,884)  
Net income (loss) 3,108   2,935   5,319 6,263  
Balance Sheet Data              
Total loans, gross 885,599 [1]   803,535   885,599 [1] 803,535  
Total assets 871,154   787,432   871,154 787,432  
Total funds borrowed $ 721,820 [2]   $ 630,034 [3]   $ 721,820 [2] $ 630,034 [3]  
Selected Financial Ratios              
Return on average assets 1.49%   1.49%   1.30% 1.58%  
Return on average equity 9.04%   8.68%   7.80% 9.31%  
Interest yield 9.93%   9.99%   9.78% 9.88%  
Net interest margin, gross 6.48%   6.35%   6.23% 6.34%  
Net interest margin, net of allowance 6.64%   6.52%   6.38% 6.50%  
Reserve coverage 2.42% [4]   2.54% [5]   2.42% [6] 2.54% [7]  
Delinquency status 0.17% [8]   0.16% [9]   0.17% [10] 0.16% [11]  
Charge-off (recovery) ratio 1.37% [12]   1.87% [13]   1.40% [14] 1.71% [15]  
Operating Segments [Member] | Commercial Lending [Member]              
Segment Reporting Disclosure [Line Items]              
Total interest income $ 3,505   $ 3,755   $ 6,954 $ 7,098  
Total interest expense 1,371   1,157   2,763 2,210  
Net interest income 2,134   2,598   4,191 4,888  
Provision (benefit) for credit losses 700   2,912   1,159 6,026  
Net interest income after provision for credit losses 1,434   (314)   3,032 (1,138)  
Other income, net 237   6,358   685 16,000  
Other expenses              
Salaries 1,066   1,074   1,805 2,216  
Loan servicing fees and collection costs 0   0   0 0  
Other costs 748   335   1,291 666  
Total other expenses 1,814   1,409   3,096    
Operating expenses           2,882  
Net income (loss) before taxes (143)   4,635   621 11,980  
Income tax (provision) benefit 115   (1,337)   (195) (3,773)  
Net income (loss) (28)   3,298   426 8,207  
Balance Sheet Data              
Total loans, gross 126,177 [1]   121,415   126,177 [1] 121,415  
Total assets 117,535   111,961   117,535 111,961  
Total funds borrowed $ 97,387 [2]   $ 89,581 [3]   $ 97,387 [2] $ 89,581 [3]  
Selected Financial Ratios              
Return on average assets (0.35%)   11.94%   0.61% 15.15%  
Return on average equity (2.20%)   69.66%   3.73% 88.99%  
Interest yield 11.44%   12.97%   11.48% 12.10%  
Net interest margin, gross 6.97%   8.78%   6.92% 8.53%  
Net interest margin, net of allowance 7.56%   9.49%   7.49% 9.10%  
Reserve coverage 8.10% [4]   9.14% [5]   8.10% [6] 9.14% [7]  
Delinquency status 10.31% [8]   16.78% [9]   10.31% [10] 16.78% [11]  
Charge-off (recovery) ratio 0.24% [12]   (0.03%) [13]   0.11% [14] 0.21% [15]  
Operating Segments [Member] | Taxi Medallion Lending [Member]              
Segment Reporting Disclosure [Line Items]              
Total interest income $ 167   $ 72   $ 226 $ 152  
Total interest expense 29   38   59 50  
Net interest income 138   34   167 102  
Provision (benefit) for credit losses (68)   (620)   (114) (1,435)  
Net interest income after provision for credit losses 206   654   281 1,537  
Other income, net 1,332   748   2,449 1,592  
Other expenses              
Salaries 718   583   1,419 1,233  
Loan servicing fees and collection costs 30   102   58 251  
Other costs 125   155   159 339  
Total other expenses 873   840   1,636    
Operating expenses           1,823  
Net income (loss) before taxes 665   562   1,094 1,306  
Income tax (provision) benefit (220)   (168)   (380) (415)  
Net income (loss) 445   394   714 891  
Balance Sheet Data              
Total loans, gross 1,293 [1]   1,564   1,293 [1] 1,564  
Total assets 3,535   6,009   3,535 6,009  
Total funds borrowed 2,929 [2]   4,808 [3]   2,929 [2] 4,808 [3]  
Intersegment Eliminations [Member]              
Segment Reporting Disclosure [Line Items]              
Total interest income 2,675   2,381   4,825 4,146  
Total interest expense 2,592   2,698   4,517 6,641  
Net interest income 83   (317)   308 (2,495)  
Provision (benefit) for credit losses 74   0   74 0  
Net interest income after provision for credit losses 9   (317)   234 (2,495)  
Other income, net 1,487   734   2,297 1,445  
Other expenses              
Salaries 3,278   3,507   6,381 5,689  
Loan servicing fees and collection costs 47   (419)   62 29  
Other costs 1,674   1,462   2,936 2,186  
Total other expenses 4,999   4,550   9,379    
Operating expenses           7,904  
Net income (loss) before taxes (3,503)   (4,133)   (6,848) (8,954)  
Income tax (provision) benefit 1,081   1,224   2,353 2,823  
Net income (loss) (2,422)   (2,909)   (4,495) (6,131)  
Balance Sheet Data              
Total loans, gross 21,376 [1]   12,285   21,376 [1] 12,285  
Total assets 507,693   480,871   507,693 480,871  
Total funds borrowed $ 420,664 [2]   $ 384,750 [3]   $ 420,664 [2] $ 384,750 [3]  
[1] Inclusive of strategic partnership loans held for sale, at lower of amortized cost or fair value.
[2] Excludes deferred financing costs of $10.2 million as of June 30, 2026.
[3] Excludes deferred financing costs of $8.5 million as of June 30, 2025.
[4] Allowance for credit loss as a percent of gross loans held for investment and excludes loans held for sale.
[5] Allowance for credit loss as a percent of gross loans held for investment and excludes loans held for sale.
[6] Allowance for credit loss as a percent of gross loans held for investment and excludes loans held for sale.
[7] Allowance for credit loss as a percent of gross loans held for investment and excludes loans held for sale.
[8] Loans 90 days or more past due as a percent of total loans.
[9] Loans 90 days or more past due as a percent of total loans.
[10] Loans 90 days or more past due as a percent of total loans.
[11] Loans 90 days or more past due as a percent of total loans.
[12] Net charge-offs as a percent of average gross loans.
[13] Net charge-offs as a percent of average gross loans. Charge-off ratio in the recreation lending segment was 3.25% when excluding loans held for sale.
[14] Net charge-offs as a percent of average gross loans.
[15] Net charge-offs as a percent of average gross loans. Charge-off ratio in the recreation lending segment was 3.94% when excluding loans held for sale.