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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 3,004  
Due after one year to five years 164  
Due after five years to ten years 5,817  
Due after ten years 27,682  
Total 36,667 $ 31,102 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 3,001  
Due after one year to five years 172  
Due after five years to ten years 6,282  
Due after ten years 28,877  
Total 38,332 $ 32,580
Available-for-sale Securities, Amortized Cost:    
Due within one year 0  
Due after one year to five years 121  
Due after five years to ten years 6,301  
Due after ten years 35,239  
Total 41,661  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 121  
Due after five years to ten years 6,068  
Due after ten years 35,281  
Total $ 41,470  
[1] Derived from audited consolidated financial statements.