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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
 6 Months Ended 9 Months Ended
Nov. 04, 2024
USD ($)
$ / shares
shares
Nov. 01, 2024
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Sep. 30, 2024
nonbankSubsidiary
segment
$ / shares
Oct. 31, 2024
$ / shares
Dec. 31, 2023
$ / shares
Subsidiary, Sale of Stock [Line Items]            
Number of nonbank subsidiaries | nonbankSubsidiary       4    
Number of reportable segments | segment       1    
Common stock, par value (in dollars per share) | $ / shares       $ 1.00   $ 1.00
Subsequent Event            
Subsidiary, Sale of Stock [Line Items]            
Net proceeds received after underwriting discount and other estimated offering expenses   $ 70.0        
Number of shares issued in transaction (in shares) | shares 2,375,000 2,375,000        
Common stock, price per share (in dollars per share) | $ / shares $ 29.50 $ 29.50        
Additional stock purchase, threshold trading days   30 days        
Percentage of additional stock purchase   15.00%        
Additional shares issued (in shares) | shares 356,250 356,250        
Proceeds of public offering, gross $ 80.6          
Proceeds of public offering, net $ 76.5          
Subsequent Event | William Penn Bancorporation            
Subsidiary, Sale of Stock [Line Items]            
Common stock, par value (in dollars per share) | $ / shares         $ 0.01  
Subsequent Event | William Penn Bancorporation            
Subsidiary, Sale of Stock [Line Items]            
Recapitalization exchange ratio         0.426  
Subsequent Event | Scenario Forecast | William Penn Bancorporation            
Subsidiary, Sale of Stock [Line Items]            
Consideration transferred     $ 127.0