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Business Combinations - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 25, 2025
USD ($)
shares
Sep. 24, 2025
USD ($)
$ / shares
May 12, 2025
USD ($)
Apr. 30, 2025
USD ($)
branch
$ / shares
shares
Jul. 31, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Business Combination [Line Items]                      
Goodwill           $ 136,620     $ 136,620   $ 128,160
Merger and acquisition           $ 233   $ 109 $ 11,558 $ 109  
Common stock, par value (in dollars per share) | $ / shares           $ 1.00     $ 1.00   $ 1.00
Commonwealth Benefits Group Aquisition                      
Business Combination [Line Items]                      
Consideration transferred         $ 2,000            
Additional consideration pursuant to earnout period         $ 800            
Additional consideration earn out period (in years)         3 years            
Goodwill         $ 1,100            
Merger and acquisition                     $ 545
Charis Insurance Group Inc                      
Business Combination [Line Items]                      
Consideration transferred     $ 4,000                
Goodwill     $ 1,600                
Merger and acquisition                 $ 164    
William Penn Acquisition                      
Business Combination [Line Items]                      
Consideration transferred       $ 103,213              
Goodwill       $ 6,857              
Merger and acquisition           $ 3     11,200    
Percentage of voting interest acquired       100.00%              
Additional branches | branch       12              
Closing price per share (in dollars per share) | $ / shares       $ 29.05              
Equity interest issued or issuable, converted and issued (in shares) | shares       0.426              
Equity interest issued or issuable, number of shares (in shares) | shares       3,506,795              
Equity interest issued or issuable, additional number of shares (in shares) | shares       538,447              
Grant date fair value       $ 3,100              
Amount at purchase price       358              
Discount (premium)       15              
Amount at par value       343              
Provision expense       2,300              
Revenue           5,000     9,500    
Net income (loss)           $ (255)     $ 438    
William Penn Acquisition | Pre-Combination Vesting                      
Business Combination [Line Items]                      
Grant date fair value       1,300              
William Penn Acquisition | Post-Combination Vesting                      
Business Combination [Line Items]                      
Grant date fair value       $ 1,800              
1st Colonial Bancorp, Inc.                      
Business Combination [Line Items]                      
Closing price per share (in dollars per share) | $ / shares   $ 18.50                  
Business combination, price of acquisition, expected   $ 101,000                  
Common stock, par value (in dollars per share) | $ / shares   $ 0.0                  
Business combination, exchange ratio   0.6945                  
Cumberland Advisors                      
Business Combination [Line Items]                      
Business combination, price of acquisition, expected $ 5,500                    
Equity interest purchase price, percent 70.00%                    
Contingent consideration, maximum amount $ 1,000                    
Annualized revenue             $ 9,000        
Business combination, recognized asset acquired, asset, expected $ 3,300,000                    
Cumberland Advisors | Stock Appreciation Rights (SARs)                      
Business Combination [Line Items]                      
Equity interest issued or issuable, number of shares (in shares) | shares 200,000                    
Maximum aggregate value $ 1,200