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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 0  
Due after one year to five years 7,071  
Due after five years to ten years 43  
Due after ten years 956  
Total 8,070 $ 7,139 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 6,980  
Due after five years to ten years 43  
Due after ten years 1,530  
Total 8,553 $ 7,744
Available-for-sale Securities, Amortized Cost:    
Due within one year 0  
Due after one year to five years 0  
Due after five years to ten years 0  
Due after ten years 252  
Total 252  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 0  
Due after five years to ten years 0  
Due after ten years 262  
Total $ 262  
[1] Derived from audited consolidated financial statements.