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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 7,969  
Due after one year to five years 3,965  
Due after five years to ten years 67  
Due after ten years 809  
Total 12,810 $ 7,139
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 7,946  
Due after one year to five years 3,884  
Due after five years to ten years 68  
Due after ten years 1,366  
Total 13,264 $ 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 231  
Total 231  
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 237  
Total $ 237