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Investment Securities: Narrative (Details)
 12 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
security
Sep. 30, 2023
USD ($)
security
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]      
Loss on sale of securities $ 4,000 $ 2,000 $ 11,000
Held-to-maturity securities, realized loss, number of securities | security 17 14 14
Gain on sale of investments $ 24,000 $ 0 $ 95,000
Number of available for sale investment securities sold | security 6   2
ACL $ 36,000 60,000 $ 0
Accrued interest on held-to-maturity securites 316,000 455,000  
Asset Pledged as Collateral      
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]      
Security owned and pledged as collateral 195,934,000 208,810,000  
Private label residential      
Schedule of Held-to-maturity and Available-for-sale Securities [Line Items]      
ACL 35,000 55,000 $ 0
Held-to-maturity securities in non-accrual status $ 35,000 $ 51,000