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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Total loans receivable | $ 1,517,970 |  | $ 1,514,304 |  |  |  |
Undisbursed portion of construction loans in process ("LIP") | 75,042 |  | 69,878 |  |  |  |
Deferred loan origination fees, net | 5,329 |  | 5,425 |  |  |  |
Allowance for loan losses | 17,525 | $ 17,288 | 17,478 |  | $ 16,818 | $ 16,655 | $ 15,817
Less: Loans in process, Deferred fees and Allowance for loan losses | 97,896 |  | 92,781 |  |  |  |
Loans receivable, net | $ 1,420,074 |  | $ 1,421,523 | [1] |  |  |
Ratio of loan category to total loans receivable (percent) | 100.00% |  | 100.00% |  |  |  |
Loans held for sale | $ 1,151 |  | $ 0 | [1] |  |  |
Total mortgage loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 1,336,738 |  | $ 1,324,259 |  |  |  |
Ratio of loan category to total loans receivable (percent) | 88.10% |  | 87.40% |  |  |  |
One-to four-family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 315,421 |  | $ 299,123 |  |  |  |
Allowance for loan losses | $ 2,800 | 2,699 | $ 2,632 |  | 2,185 | 2,096 | 2,417
Ratio of loan category to total loans receivable (percent) | 20.80% |  | 19.70% |  |  |  |
Loans held for sale | $ 1,200 |  | $ 0 |  |  |  |
Multi-family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | 178,590 |  | 177,350 |  |  |  |
Allowance for loan losses | $ 1,315 | 1,311 | $ 1,308 |  | 1,358 | 1,200 | 1,156
Ratio of loan category to total loans receivable (percent) | 11.80% |  | 11.70% |  |  |  |
Commercial real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 602,248 |  | $ 599,219 |  |  |  |
Allowance for loan losses | $ 6,983 | 6,892 | $ 6,934 |  | 6,954 | 6,822 | 7,209
Ratio of loan category to total loans receivable (percent) | 39.70% |  | 39.60% |  |  |  |
Construction-custom & owner/builder (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 114,401 |  | $ 132,101 |  |  |  |
Allowance for loan losses | $ 1,217 | 1,261 | $ 1,328 |  | 1,215 | 1,234 | 750
Ratio of loan category to total loans receivable (percent) | 7.50% |  | 8.70% |  |  |  |
Construction-speculative one-to four-family (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 9,791 |  | $ 11,495 |  |  |  |
Allowance for loan losses | $ 89 | 82 | $ 128 |  | 142 | 132 | 148
Ratio of loan category to total loans receivable (percent) | 0.60% |  | 0.80% |  |  |  |
Construction-commercial (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 22,352 |  | $ 29,463 |  |  |  |
Allowance for loan losses | $ 358 | 329 | $ 537 |  | 451 | 430 | 316
Ratio of loan category to total loans receivable (percent) | 1.50% |  | 1.90% |  |  |  |
Construction-multi-family (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 46,602 |  | $ 28,401 |  |  |  |
Allowance for loan losses | $ 543 | 527 | $ 456 |  | 478 | 735 | 602
Ratio of loan category to total loans receivable (percent) | 3.10% |  | 1.90% |  |  |  |
Construction-land development (1) |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 15,032 |  | $ 17,741 |  |  |  |
Allowance for loan losses | $ 375 | 292 | $ 335 |  | 255 | 298 | 274
Ratio of loan category to total loans receivable (percent) | 1.00% |  | 1.20% |  |  |  |
Land |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Mortgage loans | $ 32,301 |  | $ 29,366 |  |  |  |
Allowance for loan losses | $ 852 | 802 | $ 793 |  | 840 | 757 | 406
Ratio of loan category to total loans receivable (percent) | 2.10% |  | 1.90% |  |  |  |
Total consumer loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Consumer loans | $ 49,833 |  | $ 51,042 |  |  |  |
Ratio of loan category to total loans receivable (percent) | 3.30% |  | 3.40% |  |  |  |
Home equity and second mortgage |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Consumer loans | $ 47,458 |  | $ 47,913 |  |  |  |
Allowance for loan losses | $ 345 | 353 | $ 348 |  | 305 | 286 | 519
Ratio of loan category to total loans receivable (percent) | 3.10% |  | 3.20% |  |  |  |
Consumer loans, other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Consumer loans | $ 2,375 |  | $ 3,129 |  |  |  |
Allowance for loan losses | $ 33 | 34 | $ 39 |  | 45 | 46 | 53
Ratio of loan category to total loans receivable (percent) | 0.20% |  | 0.20% |  |  |  |
Commercial business |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial business loans | $ 131,243 |  | $ 138,743 |  |  |  |
Allowance for loan losses | $ 2,615 | $ 2,706 | $ 2,640 |  | $ 2,590 | $ 2,619 | $ 1,967
Ratio of loan category to total loans receivable (percent) | 8.60% |  | 9.20% |  |  |  |
SBA PPP |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial business loans | $ 156 |  | $ 260 |  |  |  |
Ratio of loan category to total loans receivable (percent) | 0.00% |  | 0.00% |  |  |  |
Total Commercial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Commercial business loans | $ 131,399 |  | $ 139,003 |  |  |  |
Ratio of loan category to total loans receivable (percent) | 8.60% |  | 9.20% |  |  |  |
[1] | Derived from audited consolidated financial statements.

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