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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 18 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Sep. 30, 2023
Loans and Allowance for Loan Losses            
Mortgage loans in process of foreclosure amount $ 539,000   $ 539,000   $ 539,000  
Interest income related to nonaccrual loans 0   0      
Amount of new and modification FDMs     0      
Loans and leases receivable impaired commitment to lend   $ 1,000   $ 1,000    
Financing receivable allowance for credit losses, Write-downs   59,000   388,000    
Provision for credit losses - loans 713,000 372,000 1,183,000 1,356,000    
Impaired financing receivable, Unpaid principal balance           $ 18,990,000
Commercial real estate            
Loans and Allowance for Loan Losses            
Impaired financing receivable, Unpaid principal balance           944,000
Residential real estate            
Loans and Allowance for Loan Losses            
Real estate properties owned         444,000,000  
Impaired financing receivable, Unpaid principal balance           3,467,000
SBA Lending            
Loans and Allowance for Loan Losses            
Servicing assets valuation allowance 0   0   0 60,000
SBA            
Loans and Allowance for Loan Losses            
Unpaid principal balance of loans 217,600,000 238,400,000 217,600,000 238,400,000 217,600,000 209,600,000
SBA | Bank Servicing            
Loans and Allowance for Loan Losses            
Revenue from Contract with Customer 2,000 14,000 8,000 34,000    
Net servicing income 458,000 564,000 922,000 1,100,000    
Troubled Debt Restructuring            
Loans and Allowance for Loan Losses            
Loans and leases receivable allowance covered   111,000   111,000    
Financing receivable allowance for credit losses, Write-downs   3,000   6,000    
Mortgage Servicing Rights.            
Loans and Allowance for Loan Losses            
Unpaid principal balance of loans 0   0   0  
Impaired financing receivable, Unpaid principal balance           4,770,000,000
Revenue from Contract with Customer 93,000 2,400,000 1,500,000 4,800,000    
Escrow balances maintained with foregoing loan servicing and other liabilities 0   0   0 47,900,000
Nonresidential MSR            
Loans and Allowance for Loan Losses            
Unpaid principal balance of loans 40,300,000 44,000,000.0 40,300,000 44,000,000.0 40,300,000 40,400,000
Revenue from Contract with Customer 1,000 $ 5,000 4,000 $ 14,000    
Servicing assets valuation allowance $ 0   $ 0   $ 0 $ 0