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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 0  
Due after one year to five years 35,148  
Due after five years to ten years 51,072  
Due after ten years 28,380  
Total 114,600 $ 69,102 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 35,214  
Due after five years to ten years 51,272  
Due after ten years 28,713  
Total 115,199 $ 70,109
Available-for-sale Securities, Amortized Cost:    
Due within one year 744  
Due after one year to five years 3,710  
Due after five years to ten years 13,432  
Due after ten years 38,595  
Total 56,481  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 743  
Due after one year to five years 3,709  
Due after five years to ten years 13,454  
Due after ten years 38,646  
Total $ 56,552  
[1] Derived from audited consolidated financial statements.