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Business Combination - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 19, 2023
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Business Acquisition [Line Items]        
Goodwill $ 20,477      
Other professional services   $ 854 $ 303  
Provision for estimated credit losses   $ 4,162   $ 0
Regal Bancorp Inc        
Business Acquisition [Line Items]        
Date of acquisition   Sep. 19, 2023    
Common stock converted into the right to receive in cash $ 23.00      
Goodwill $ 20,500 $ 20,500    
Merger-related expenses   $ 3,856 $ 196  
One-time merger related expenses 3,900      
Change in control payments 2,600      
Investment banking services 612      
Termination of data processing contract 414      
Legal related expenses 99      
Severance payments 42      
Other professional services 17      
Other miscellaneous expenses 30      
Charitable contribution expense 5,400      
Provision for estimated credit losses 4,200      
Regal Bancorp Inc | Core Deposit        
Business Acquisition [Line Items]        
Intangible asset acquired $ 9,000      
Estimated useful life 10 years 10 years