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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Sep. 30, 2016
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 14  
Due after one year to five years 5,995  
Due after five to ten years 14  
Due after ten years 1,303  
Total 7,326 $ 7,511 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 14  
Due after one year to five years 5,997  
Due after five to ten years 14  
Due after ten years 2,020  
Total 8,045 $ 8,395
Available-for-sale Securities, Amortized Cost:    
Due within one year 0  
Due after one year to five years 0  
Due after five to ten years 0  
Due after ten years 307  
Total 307  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 0  
Due after five to ten years 0  
Due after ten years 328  
Total $ 328  
[1] Derived from audited consolidated financial statements.