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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 15,148  
Due after one year to five years 67,575  
Due after five years to ten years 1,179  
Due after ten years 57,052  
Total 140,954 $ 172,097 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 15,044  
Due after one year to five years 63,638  
Due after five years to ten years 1,235  
Due after ten years 54,465  
Total 134,382 166,007
Available-for-sale Securities, Amortized Cost:    
Due within one year 4,908  
Due after one year to five years 9,576  
Due after five years to ten years 1,507  
Due after ten years 69,664  
Amortized Cost 85,655 $ 72,231
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 4,895  
Due after one year to five years 9,607  
Due after five years to ten years 1,501  
Due after ten years 68,804  
Total $ 84,807  
[1] Derived from audited consolidated financial statements.