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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments in equity securities, at fair value $ 853 $ 866 [1]
Other investments, at cost 3,000 3,000 [1]
Recorded Amount    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 191,211 164,728
CDs held for investment 8,711 10,209
Investment securities 225,761 244,354
Investments in equity securities, at fair value 853 866
FHLB stock 2,045 2,037
Other investments, at cost 3,000 3,000
Loans held for sale 1,151  
Loans receivable, net 1,420,074 1,421,523
Accrued interest receivable 7,127 6,990
Certificates of deposit 401,285 368,308
FHLB borrowings 20,000 20,000
Accrued interest payable 1,697 2,132
Fair Value    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 191,211 164,728
CDs held for investment 8,711 10,209
Investment securities 219,189 238,264
Investments in equity securities, at fair value 853 866
FHLB stock 2,045 2,037
Other investments, at cost 3,000 3,000
Loans held for sale 1,182  
Loans receivable, net 1,385,482 1,387,642
Accrued interest receivable 7,127 6,990
Certificates of deposit 401,337 368,312
FHLB borrowings 19,967 20,035
Accrued interest payable 1,697 2,132
Fair Value | Fair Value, Inputs, Level 1    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 191,211 164,728
CDs held for investment 8,711 10,209
Investment securities 75,123 92,123
Investments in equity securities, at fair value 853 866
FHLB stock 2,045 2,037
Other investments, at cost 3,000 3,000
Loans held for sale 1,182  
Loans receivable, net 0 0
Accrued interest receivable 7,127 6,990
Certificates of deposit 0 0
FHLB borrowings 0 0
Accrued interest payable 1,697 2,132
Fair Value | Fair Value, Inputs, Level 2    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
CDs held for investment 0 0
Investment securities 144,066 146,141
Investments in equity securities, at fair value 0 0
FHLB stock 0 0
Other investments, at cost 0 0
Loans held for sale 0  
Loans receivable, net 0 0
Accrued interest receivable 0 0
Certificates of deposit 0 0
FHLB borrowings 0 0
Accrued interest payable 0 0
Fair Value | Fair Value, Inputs, Level 3    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
CDs held for investment 0 0
Investment securities 0 0
Investments in equity securities, at fair value 0 0
FHLB stock 0 0
Other investments, at cost 0 0
Loans held for sale 0  
Loans receivable, net 1,385,482 1,387,642
Accrued interest receivable 0 0
Certificates of deposit 401,337 368,312
FHLB borrowings 19,967 20,035
Accrued interest payable $ 0 $ 0
[1] Derived from audited consolidated financial statements.