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Investment Securities: Held-to-Maturity Investment Securities by Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Sep. 30, 2024
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	$ 140,954	$ 172,097
U.S. Treasury and U.S. government agency securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	69,475	92,312
U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	47,017	49,481
Private label residential
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	22,744	28,479
Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	1,220	1,330
Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	498	495
AAA/AA/A
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	132,257	159,300
AAA/AA/A | U.S. Treasury and U.S. government agency securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	69,475	92,312
AAA/AA/A | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	47,017	49,481
AAA/AA/A | Private label residential
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	14,545	16,277
AAA/AA/A | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	1,220	1,230
AAA/AA/A | Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B | U.S. Treasury and U.S. government agency securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B | Private label residential
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
BBB/BB/B | Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
Unrated
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	8,697	12,797
Unrated | U.S. Treasury and U.S. government agency securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
Unrated | U.S. government agencies
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	0
Unrated | Private label residential
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	8,199	12,202
Unrated | Municipal securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	0	100
Unrated | Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Line Items]
Total held to maturity	$ 498	$ 495

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

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