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Subordinated Debt (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2021
Aug. 31, 2014
Oct. 31, 2013
Sep. 30, 2025
Jun. 30, 2025
Feb. 28, 2022
Business Acquisition [Line Items]            
Subordinated debt       $ 23,221,000 $ 23,208,000  
Investment, carrying value       562,600,000 538,200,000  
Prepaid Expenses and Other Current Assets            
Business Acquisition [Line Items]            
Investment, face amount       505,000    
Investment, carrying value       $ 471,000 471,000  
Trust Preferred Securities            
Business Acquisition [Line Items]            
Number of years after securities became redeemable       5 years    
Interest rate (as a percent)       7.03%    
Subordinated debt       $ 7,200,000 7,200,000  
Ozarks Legacy Community Financial, Inc.            
Business Acquisition [Line Items]            
Interest rate (as a percent)       6.75%    
Floating rate     $ 3,100,000      
Ozarks Legacy Community Financial, Inc. | Reported Value Measurement            
Business Acquisition [Line Items]            
Floating rate       $ 2,800,000 2,800,000  
Peoples Service Company, Inc.            
Business Acquisition [Line Items]            
Interest rate (as a percent)       6.10%    
Floating rate   $ 6,500,000        
Peoples Service Company, Inc. | Reported Value Measurement            
Business Acquisition [Line Items]            
Floating rate       $ 5,700,000 5,600,000  
Fortune | Subordinated notes Issued in May 2021            
Business Acquisition [Line Items]            
Interest rate (as a percent) 4.50%          
Subordinated debt       $ 7,500,000 $ 7,500,000  
Instrument face amount           $ 7,500,000
Variable rate (as a percent) 3.77%          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember