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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 0  
Due after one year to five years 11,226  
Due after five years to ten years 23,556  
Due after ten years 17,532  
Total 52,314 $ 27,890 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 11,268  
Due after five years to ten years 24,064  
Due after ten years 18,264  
Total 53,596 $ 29,827
Available-for-sale Securities, Amortized Cost:    
Due within one year 926  
Due after one year to five years 2,654  
Due after five years to ten years 18,247  
Due after ten years 45,479  
Total 67,306  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 926  
Due after one year to five years 2,653  
Due after five years to ten years 18,285  
Due after ten years 45,627  
Total $ 67,491  
[1] Derived from audited consolidated financial statements.