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Borrowings - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended
Aug. 05, 2014
Jan. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Subordinated notes        
Line of Credit Facility [Line Items]        
Interest rate (as a percent) 5.75%   5.75% 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 rate (as a percent)   4.76% 4.76% 4.53%