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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Sep. 30, 2017
Held-to-maturity Securities, Amortized Cost:    
Due after one year to five years $ 5,997  
Due after five years to ten years 34  
Due after ten years 1,046  
Total 7,077 $ 7,139 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due after one year to five years 5,961  
Due after five years to ten years 34  
Due after ten years 1,614  
Total 7,609 $ 7,744
Available-for-sale Securities, Amortized Cost:    
Due after one year to five years 0  
Due after five years to ten years 0  
Due after ten years 260  
Total 260  
Available-for-sale Securities, Estimated Fair Value:    
Due after one year to five years 0  
Due after five years to ten years 0  
Due after ten years 275  
Total $ 275  
[1] Derived from audited consolidated financial statements.