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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 56,678  
Due after one year to five years 79,591  
Due after five years to ten years 8,862  
Due after ten years 66,687  
Total 211,818 $ 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 55,861  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 73,827  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 8,056  
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 63,063  
Debt Securities, Held-to-Maturity, Fair Value, Total 200,807 253,766
Available-for-sale Securities, Amortized Cost:    
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One 9,044  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five 2,530  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5,658  
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 45,457  
Amortized Cost 62,689 $ 43,132
Available-for-sale Securities, Estimated Fair Value:    
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One 9,032  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five 2,523  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 5,658  
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 44,533  
Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value $ 61,746  
[1] Derived from audited consolidated financial statements.