v3.26.3
Borrowings - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 29, 2026
USD ($)
Apr. 02, 2026
USD ($)
Jan. 01, 2026
USD ($)
quarterly_period
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Debt Instrument [Line Items]              
Unused funds       $ 1,600,000,000   $ 1,600,000,000  
Proceeds from issuance of subordinated debt           85,000,000 $ 0
Gain on redemption of debt       0 $ 0 545,000 $ 630,000
Subordinated Debt              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent)   3.00%          
Debt instrument, face amount   $ 85,000,000.0          
Debt instrument, interest rate, stated percentage   6.50%          
Proceeds from issuance of subordinated debt   $ 66,900,000          
Gain on redemption of debt   $ 545,000          
Progressive              
Debt Instrument [Line Items]              
Debt instrument, maximum number of quarterly periods to defer interest payments without default | quarterly_period     20        
Subordinated debt obligations, fair value disclosure     $ 555,000 $ 521,000   $ 521,000  
Progressive | Junior Subordinated Debt              
Debt Instrument [Line Items]              
Subordinated debentures     5,200,000        
Progressive | Progressive Trust Preferred Security I              
Debt Instrument [Line Items]              
Subordinated debentures     $ 1,200,000        
Basis spread on variable rate (as a percent)     3.58%        
Progressive | Progressive Trust Preferred Security II              
Debt Instrument [Line Items]              
Subordinated debentures     $ 4,000,000.0        
Debt instrument, basis spread on variable rate, payable quarterly     1.45%        
Progressive | Trust Preferred Securities              
Debt Instrument [Line Items]              
Subordinated debentures     $ 5,000,000.0        
American Planning Corporation              
Debt Instrument [Line Items]              
Proceeds from issuance of subordinated debt $ 4,300,000            
American Planning Corporation | Subordinated Debt              
Debt Instrument [Line Items]              
Basis spread on variable rate (as a percent) 3.00%            
Debt instrument, interest rate, stated percentage 6.50%            
Proceeds from issuance of subordinated debt $ 4,300,000