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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Held-to-maturity Securities, Amortized Cost:    
Due after one year to five years $ 109,829  
Due after five years to ten years 50,532  
Due after ten years 29,044  
Total 189,405 $ 69,102 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due after one year to five years 105,932  
Due after five years to ten years 50,333  
Due after ten years 28,442  
Total 184,707 $ 70,109
Available-for-sale Securities, Amortized Cost:    
Due after one year to five years 3,622  
Due after five years to ten years 12,062  
Due after ten years 35,061  
Total 50,745  
Available-for-sale Securities, Estimated Fair Value:    
Due after one year to five years 3,616  
Due after five years to ten years 12,047  
Due after ten years 34,961  
Total $ 50,624  
[1] Derived from audited consolidated financial statements.