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Loans Receivable, Net - Schedule of Troubled Debt Restructuring Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	$ 16,930	$ 22,863
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	16,930	22,716
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	0	147
Commercial real estate – investor
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	16,684	19,645
Commercial real estate – investor | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	16,684	19,645
Commercial real estate – investor | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	0	0
Commercial and industrial: | Commercial and Industrial - Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		2,896
Commercial and industrial: | Current | Commercial and Industrial - Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		2,896
Commercial and industrial: | 60-89 Days Past Due | Commercial and Industrial - Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		0
Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	246	128
Residential Real Estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	246	128
Residential Real Estate | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans	$ 0	0
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		194
Other consumer | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		47
Other consumer | 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Modified loans		$ 147

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