Medallion Bank Preferred Stock (Non-controlling Interest) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended
	Dec. 17, 2019	Jul. 21, 2011	Sep. 30, 2023
Capital Purchase Program [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Preferred stock, liquidation preference per share			$ 1,000
U.S. Treasury Securities [Member] | Capital Purchase Program [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
US Treasury shares purchased		26,303
Series F Fixed-to-Floating Rate Non-cumulative Perpetual Preferred Stock [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Initial public offering shares	1,840,000
Preferred stock, aggregate liquidation amount	$ 46.0
Preferred stock, net of liquidation amount	$ 42.5
Percentage of dividend payment rate	8.00%
Series F Fixed-to-Floating Rate Non-cumulative Perpetual Preferred Stock [Member] | SOFR [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Percentage of liquidation rate basis	6.46%
Dividend description of variable rate basis	three-month Term SOFR
Series E Senior Non-Cumulative Perpetual Preferred Stock [Member] | Capital Purchase Program [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Percentage of dividend payment rate			9.00%
Aggregate purchase price		$ 26.3