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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 0  
Due after one year to five years 126  
Due after five years to ten years 7,157  
Due after ten years 20,607  
Total 27,890 $ 31,102
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 130  
Due after five years to ten years 7,937  
Due after ten years 21,760  
Total 29,827 $ 32,580
Available-for-sale Securities, Amortized Cost:    
Due within one year 831  
Due after one year to five years 3,270  
Due after five years to ten years 18,507  
Due after ten years 35,189  
Total 57,797  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 830  
Due after one year to five years 3,261  
Due after five years to ten years 18,491  
Due after ten years 35,325  
Total $ 57,907