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Loans Receivable - Summary of Activity in Allowance for Credit Losses and Recorded Investment in Loans Receivable by Loan Class (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance $ 1,116,000 $ 1,116,000 $ 1,116,000
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 4,162,000   0
Allowance for credit losses, Ending balance 5,325,000   1,116,000
Allowance for loan losses, Beginning balance 1,116,000    
Provision for credit losses 4,162,000 0  
Allowance for loan losses, Ending balance 5,325,000   1,116,000
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 5,325,000   1,116,000
Ending balance 695,498,000   361,423,000
Loans receivable, Ending balance, individually evaluated for impairment 144,000   145,000
Loans receivable, Ending balance, Collectively evaluated for impairment 695,354,000   361,278,000
Owner Occupied Commercial Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0 0 0
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 1,403,000    
Allowance for credit losses, Ending balance 1,403,000   0
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 1,403,000   0
Ending balance 60,850,000   144,000
Loans receivable, Ending balance, individually evaluated for impairment 0   0
Loans receivable, Ending balance, Collectively evaluated for impairment 60,850,000   144,000
Other Commercial Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 4,000 5,000 5,000
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 538,000   (1,000)
Allowance for credit losses, Ending balance 544,000   4,000
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 544,000   4,000
Ending balance 75,357,000   296,000
Loans receivable, Ending balance, individually evaluated for impairment 0   0
Loans receivable, Ending balance, Collectively evaluated for impairment 75,357,000   296,000
Multi-Family      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0 0 0
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 1,936,000   0
Allowance for credit losses, Ending balance 1,936,000   0
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 1,936,000   0
Ending balance 171,427,000   10,000
Loans receivable, Ending balance, individually evaluated for impairment 0   0
Loans receivable, Ending balance, Collectively evaluated for impairment 171,427,000   10,000
ASU 2016-13      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 47,000    
Allowance for credit losses, Ending balance     47,000
ASU 2016-13 | Owner Occupied Commercial Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0    
Allowance for credit losses, Ending balance     0
ASU 2016-13 | Other Commercial Real Estate      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 2,000    
Allowance for credit losses, Ending balance     2,000
ASU 2016-13 | Multi-Family      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0    
Allowance for credit losses, Ending balance     0
Commercial and Industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0 0 0
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 154,000   0
Allowance for credit losses, Ending balance 154,000   0
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 154,000   0
Ending balance 12,789,000   0
Loans receivable, Ending balance, individually evaluated for impairment 0   0
Loans receivable, Ending balance, Collectively evaluated for impairment 12,789,000   0
Commercial and Industrial | ASU 2016-13      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 0    
Allowance for credit losses, Ending balance     0
Residential      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 1,039,000 1,036,000 1,036,000
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 116,000   3,000
Allowance for credit losses, Ending balance 1,241,000   1,039,000
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 1,241,000   1,039,000
Ending balance 362,704,000   353,624,000
Loans receivable, Ending balance, individually evaluated for impairment 144,000   145,000
Loans receivable, Ending balance, Collectively evaluated for impairment 362,560,000   353,479,000
Residential | ASU 2016-13      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 86,000    
Allowance for credit losses, Ending balance     86,000
Consumer      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance 73,000 $ 75,000 75,000
Allowance for credit losses, Charge-offs 0   0
Allowance for credit losses, Recoveries 0   0
Allowance for credit losses, Provisions (credits) 15,000   (2,000)
Allowance for credit losses, Ending balance 47,000   73,000
Allowance for Credit Losses:Ending balance, Individually evaluated for impairment 0   0
Allowance for Credit Losses: Ending balance, Collectively evaluated for impairment 47,000   73,000
Ending balance 12,371,000   7,349,000
Loans receivable, Ending balance, individually evaluated for impairment 0   0
Loans receivable, Ending balance, Collectively evaluated for impairment 12,371,000   7,349,000
Consumer | ASU 2016-13      
Loans and Leases Receivable Disclosure [Line Items]      
Allowance for credit losses, Beginning balance $ (41,000)    
Allowance for credit losses, Ending balance     $ (41,000)