Consolidated Statements of Other Comprehensive Income/(Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) after taxes from operations	$ (13,001)	$ 1,395
Other comprehensive income, net of tax	147	669
Total comprehensive income (loss)	(12,854)	2,064
Less comprehensive income attributable to the non-controlling interest	642	167
Total comprehensive income (loss) attributable to Medallion Financial Corp.	$ (13,496)	$ 1,897