v3.26.1
Segment Reporting - Schedule of Segment Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Disclosure [Line Items]      
Total interest income $ 79,068 $ 75,425  
Total interest expense 25,009 24,013  
Net interest income 54,059 51,412  
Provision (benefit) for credit losses 22,476 22,014  
Net interest income after provision for credit losses 31,583 29,398  
Other income, net 2,408 11,599  
Other expenses      
Salaries 11,000 9,993  
Loan servicing fees, credit, and collection costs 5,474 4,556  
Other costs 5,900 6,209  
Total other expenses 22,374 20,758  
Operating expenses   20,758  
Net income (loss) before taxes 11,617 20,239  
Income tax (provision) benefit (4,328) (6,713)  
Net income (loss) 7,289 13,526  
Income attributable to the non-controlling interest 2,336 1,512  
Net income attributable to Medallion Financial Corp. 4,953 12,014  
Balance Sheet Data      
Total loans, gross 2,490,513   $ 2,436,916
Loans 2,617,995 [1] 2,486,433 2,566,849
Total assets 2,950,486 2,847,738 $ 2,955,464
Total funds borrowed $ 2,395,460 [2] $ 2,342,373 [3]  
Selected Financial Ratios      
Return on average assets 1.01% 1.93%  
Return on average stockholders' equity 4.91% 12.96%  
Return on average equity 5.80% [4] 12.32%  
Interest yield 11.70% 11.65%  
Net interest margin, gross 8.00% 7.94%  
Net interest margin, net of allowance 8.35% 8.25%  
Reserve coverage 4.48% [4] 4.25% [5]  
Delinquency status 0.81% [6] 1.20% [7]  
Charge-off ratio 3.23% [8] 3.10% [9]  
Recreation [Member]      
Selected Financial Ratios      
Charge-off ratio   4.67%  
Operating Segments [Member] | Consumer Lending [Member] | Recreation [Member]      
Segment Reporting Disclosure [Line Items]      
Total interest income $ 54,034 $ 50,466  
Total interest expense 14,292 12,041  
Net interest income 39,742 38,425  
Provision (benefit) for credit losses 18,445 16,870  
Net interest income after provision for credit losses 21,297 21,555  
Other income, net 26 400  
Other expenses      
Salaries 4,105 3,642  
Loan servicing fees, credit, and collection costs 4,290 3,182  
Other costs 2,683 3,140  
Total other expenses 11,078    
Operating expenses   9,964  
Net income (loss) before taxes 10,245 11,991  
Income tax (provision) benefit (3,817) (3,977)  
Net income (loss) 6,428 8,014  
Balance Sheet Data      
Total loans, gross 1,671,538 [1] 1,545,844  
Total assets 1,606,691 1,495,150  
Total funds borrowed $ 1,304,451 [2] $ 1,229,818 [3]  
Selected Financial Ratios      
Return on average assets 1.65% 2.17%  
Return on average equity 9.60% [4] 13.37%  
Interest yield 13.39% 13.25%  
Net interest margin, gross 9.85% 10.10%  
Net interest margin, net of allowance 10.40% 10.59%  
Reserve coverage 5.19% [4] 5.00% [5]  
Delinquency status 0.57% [6] 0.48% [7]  
Charge-off ratio 4.38% [8] 4.32% [9]  
Operating Segments [Member] | Consumer Lending [Member] | Home Improvement [Member]      
Segment Reporting Disclosure [Line Items]      
Total interest income $ 19,376 $ 19,771  
Total interest expense 7,370 6,964  
Net interest income 12,006 12,807  
Provision (benefit) for credit losses 3,618 2,845  
Net interest income after provision for credit losses 8,388 9,962  
Other income, net 7 2  
Other expenses      
Salaries 2,352 2,377  
Loan servicing fees, credit, and collection costs 1,141 777  
Other costs 1,378 1,830  
Total other expenses 4,871    
Operating expenses   4,984  
Net income (loss) before taxes 3,524 4,980  
Income tax (provision) benefit (1,313) (1,652)  
Net income (loss) 2,211 3,328  
Balance Sheet Data      
Total loans, gross 814,933 [1] 812,381  
Total assets 802,126 795,868  
Total funds borrowed $ 651,235 [2] $ 654,632 [3]  
Selected Financial Ratios      
Return on average assets 1.12% 1.68%  
Return on average equity 6.52% [4] 10.33%  
Interest yield 9.67% 9.78%  
Net interest margin, gross 5.99% 6.33%  
Net interest margin, net of allowance 6.14% 6.50%  
Reserve coverage 2.49% [4] 2.49% [5]  
Delinquency status 0.17% [6] 0.19% [7]  
Charge-off ratio 1.44% [8] 1.55% [9]  
Operating Segments [Member] | Commercial Lending [Member]      
Segment Reporting Disclosure [Line Items]      
Total interest income $ 3,449 $ 3,343  
Total interest expense 1,392 1,053  
Net interest income 2,057 2,290  
Provision (benefit) for credit losses 459 3,114  
Net interest income after provision for credit losses 1,598 (824)  
Other income, net 448 9,642  
Other expenses      
Salaries 739 1,142  
Loan servicing fees, credit, and collection costs 0  
Other costs 543 331  
Total other expenses 1,282    
Operating expenses   1,473  
Net income (loss) before taxes 764 7,345  
Income tax (provision) benefit (310) (2,436)  
Net income (loss) 454 4,909  
Balance Sheet Data      
Total loans, gross 119,612 [1] 116,059  
Total assets 111,561 109,565  
Total funds borrowed $ 90,575 [2] $ 90,121 [3]  
Selected Financial Ratios      
Return on average assets 1.60% 18.45%  
Return on average equity 9.32% [4] 113.46%  
Interest yield 11.57% 11.16%  
Net interest margin, gross 6.90% 8.25%  
Net interest margin, net of allowance 7.47% 8.71%  
Reserve coverage 7.96% [4] 7.04% [5]  
Delinquency status 8.58% [6] 17.63% [7]  
Charge-off ratio [9]   0.47%  
Operating Segments [Member] | Taxi Medallion Lending [Member]      
Segment Reporting Disclosure [Line Items]      
Total interest income $ 59 $ 80  
Total interest expense 30 12  
Net interest income 29 68  
Provision (benefit) for credit losses (46) (815)  
Net interest income after provision for credit losses 75 883  
Other income, net 1,117 844  
Other expenses      
Salaries 701 650  
Loan servicing fees, credit, and collection costs 28 149  
Other costs 34 184  
Total other expenses 763    
Operating expenses   983  
Net income (loss) before taxes 429 744  
Income tax (provision) benefit (160) (247)  
Net income (loss) 269 497  
Balance Sheet Data      
Total loans, gross 1,126 [1] 1,650  
Total assets 3,836 6,855  
Total funds borrowed 3,114 [2] 5,638 [3]  
Intersegment Eliminations [Member]      
Segment Reporting Disclosure [Line Items]      
Total interest income 2,150 1,765  
Total interest expense 1,925 3,943  
Net interest income 225 (2,178)  
Provision (benefit) for credit losses 0 0  
Net interest income after provision for credit losses 225 (2,178)  
Other income, net 810 711  
Other expenses      
Salaries 3,103 2,182  
Loan servicing fees, credit, and collection costs 15 448  
Other costs 1,262 724  
Total other expenses 4,380    
Operating expenses   3,354  
Net income (loss) before taxes (3,345) (4,821)  
Income tax (provision) benefit 1,272 1,599  
Net income (loss) (2,073) (3,222)  
Balance Sheet Data      
Total loans, gross 10,786 [1] 10,499  
Total assets 426,272 440,300  
Total funds borrowed $ 346,085 [2] $ 362,164 [3]  
[1] Inclusive of strategic partnership loans held for sale, at lower of amortized cost or fair value.
[2] Excludes deferred financing costs of $8.2 million as of March 31, 2026.
[3] Excludes deferred financing costs of $8.1 million as of March 31, 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] Loans 90 days or more past due as a percent of total loans.
[7] Loans 90 days or more past due as a percent of total loans.
[8] Net charge-offs as a percent of average gross loss.
[9] Net charge-offs as a percent of average gross loss. Charge-off ratio in the recreation lending segment was 4.67% when excluding loans held for sale