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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 3,025  
Due after one year to five years 495  
Due after five years to ten years 5,893  
Due after ten years 21,689  
Total 31,102 $ 12,810
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 3,017  
Due after one year to five years 498  
Due after five years to ten years 6,272  
Due after ten years 22,793  
Total 32,580 $ 13,264
Available-for-sale Securities, Amortized Cost:    
Due within one year 0  
Due after one year to five years 145  
Due after five years to ten years 129  
Due after ten years 22,144  
Total 22,418  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 145  
Due after five years to ten years 130  
Due after ten years 22,257  
Total $ 22,532