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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended
Sep. 30, 2024
Aug. 05, 2014
Jan. 31, 2024
Dec. 31, 2023
Senior Notes        
Line of Credit Facility [Line Items]        
Interest rates (as a percent) 10.00%      
Subordinated notes        
Line of Credit Facility [Line Items]        
Interest rates (as a percent)   5.75%    
Face amount   $ 70.0    
Net proceeds from issuance of subordinated long-term debt   68.8    
Payments of debt issuance costs   $ 1.2    
BTFP | Secured Debt        
Line of Credit Facility [Line Items]        
Securities borrowed     $ 500.0  
Short-term debt, refinanced, amount     $ 500.0  
Interest rates (as a percent) 4.76%   4.76% 4.53%
Senior Notes, Due September 30, 2029 | Senior Notes        
Line of Credit Facility [Line Items]        
Net proceeds from issuance of subordinated long-term debt $ 75.8      
Payments of debt issuance costs $ 1.9      
Senior Notes, Due September 30, 2029 | Unsecured Debt        
Line of Credit Facility [Line Items]        
Interest rates (as a percent) 10.00%      
Face amount $ 77.7