Consolidated Statements of Other Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) after taxes from operations	$ (20,033)	$ 7,435	$ (35,299)	$ 2,187
Other comprehensive income (loss), net of tax	(53)	95	1,075	1,322
Total comprehensive income (loss)	(20,086)	7,530	(34,224)	3,509
Less comprehensive income attributable to the non-controlling interest	3,597	2,460	5,951	3,484
Total comprehensive income (loss) attributable to Medallion Financial Corp.	$ (23,683)	$ 5,070	$ (40,175)	$ 25