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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 27,648  
Due after one year to five years 79,040  
Due after five years to ten years 6,345  
Due after ten years 63,754  
Total 176,787 $ 270,218 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 27,156  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 73,530  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5,675  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 60,400  
Debt Securities, Held-to-Maturity, Fair Value, Total 166,761 253,766
Available-for-sale Securities, Amortized Cost:    
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 8,961  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 2,497  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5,653  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 58,093  
Amortized Cost 75,204 $ 43,132
Available-for-sale Securities, Estimated Fair Value:    
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 8,946  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 2,496  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5,640  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 57,433  
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value $ 74,515  
[1] Derived from audited consolidated financial statements.