Consolidated Statements of Other Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss after taxes from operations	$ (2,265)	$ (6,643)	$ (15,266)	$ (5,248)
Other comprehensive income, net of tax	981	558	1,128	1,227
Total comprehensive loss	(1,284)	(6,085)	(14,138)	(4,021)
Less comprehensive income attributable to the non-controlling interest	1,712	857	2,354	1,024
Total comprehensive loss attributable to Medallion Financial Corp.	$ (2,996)	$ (6,942)	$ (16,492)	$ (5,045)