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Loans and Allowance for Credit Losses - Performance of Loans Modified (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	$ 0	$ 39
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	96	0
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	116	16
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	212	55
Real Estate Loan | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	28
Real Estate Loan | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Real Estate Loan | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Real Estate Loan | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	28
Consumer Loans | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Consumer Loans | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	96	0
Consumer Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	116	16
Consumer Loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	212	16
Commercial and Industrial Loans | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	11
Commercial and Industrial Loans | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial and Industrial Loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
Commercial and Industrial Loans | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	11
1-4 Family | Residential Properties | Real Estate Loan | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	28
1-4 Family | Residential Properties | Real Estate Loan | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
1-4 Family | Residential Properties | Real Estate Loan | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	0	0
1-4 Family | Residential Properties | Real Estate Loan | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Performance Recorded Investment	$ 0	$ 28

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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