v3.26.1
Medallion Bank Preferred Stock (Non-controlling Interest) - Additional Information (Detail) - USD ($)
 3 Months Ended
Jul. 01, 2025
May 29, 2025
Dec. 17, 2019
Jul. 21, 2011
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2021
Changes In Equity And Comprehensive Income Line Items [Line Items]              
Carrying amount         $ 0 $ 0  
Investment, Type [Extensible Enumeration]             Equity Securities [Member]
Capital Purchase Program [Member]              
Changes In Equity And Comprehensive Income Line Items [Line Items]              
Preferred stock, aggregate liquidation amount         $ 1,000    
US Treasury shares purchased       26,303      
Investment, Type [Extensible Enumeration]       us-gaap:USTreasurySecuritiesMember      
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     $ 46,000,000        
Preferred stock, net of liquidation amount     $ 42,500,000        
Percentage of dividend payment rate     8.00%        
Percentage of liquidation rate basis     6.46%        
Redemption charges $ 3,500,000            
Carrying amount 42,500,000            
Dividend description of variable rate basis     three-month Term 90-day Secured Overnight Financing Rate, or SOFR        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:SecuredOvernightFinancingRateSofrMember        
Preferred stock, liquidation preference per share     $ 25        
Series G Fixed To Floating Rate Noncumulative Perpetual Preferred Stock [Member]              
Changes In Equity And Comprehensive Income Line Items [Line Items]              
Initial public offering shares   3,100,000          
Preferred stock, aggregate liquidation amount   $ 77,500,000          
Preferred stock, net of liquidation amount   $ 73,100,000          
Percentage of dividend payment rate   9.00%          
Percentage of liquidation rate basis   4.94%          
Dividend description of variable rate basis   five-year U.S. Treasury rate plus a spread          
Investment, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrMember          
Preferred stock, liquidation preference per share   $ 25          
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       $ 26,300,000      
Series F Preferred Stock [Member]              
Changes In Equity And Comprehensive Income Line Items [Line Items]              
Redemption price of stock $ 46,000,000