v3.26.1
Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments in equity securities, at fair value $ 858 $ 864 [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 246,082 243,428
CDs held for investment 7,964 7,217
Investment securities 208,071 215,101
Investments in equity securities, at fair value 858 864
FHLB stock 1,653 2,045
Other investments, at cost 3,000 3,000
Loans held for sale 2,774 1,127
Loans receivable, net 1,495,651 1,463,590
Accrued interest receivable 7,321 7,393
Certificates of deposit 448,226 442,521
FHLB borrowings 10,000 20,000
Accrued interest payable 1,790 1,963
Fair Value    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 246,082 243,428
CDs held for investment 7,964 7,217
Investment securities 203,727 210,574
Investments in equity securities, at fair value 858 864
FHLB stock 1,653 2,045
Other investments, at cost 3,000 3,000
Loans held for sale 2,820 1,159
Loans receivable, net 1,485,508 1,441,850
Accrued interest receivable 7,321 7,393
Certificates of deposit 447,554 442,024
FHLB borrowings 9,997 20,009
Accrued interest payable 1,790 1,963
Fair Value | Fair Value, Inputs, Level 1    
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 246,082 243,428
CDs held for investment 7,964 7,217
Investment securities 54,676 71,870
Investments in equity securities, at fair value 858 864
FHLB stock 1,653 2,045
Other investments, at cost 3,000 3,000
Loans held for sale 2,820 1,159
Loans receivable, net 0 0
Accrued interest receivable 7,321 7,393
Certificates of deposit 0 0
FHLB borrowings 0 0
Accrued interest payable 1,790 1,963
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 149,051 138,704
Investments in equity securities, at fair value 0 0
FHLB stock 0 0
Other investments, at cost 0 0
Loans held for sale 0 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 0
Loans receivable, net 1,485,508 1,441,850
Accrued interest receivable 0 0
Certificates of deposit 447,554 442,024
FHLB borrowings 9,997 20,009
Accrued interest payable $ 0 $ 0
[1] Derived from audited consolidated financial statements.