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Investment Securities: Schedule of Contractual maturities of debt securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Held-to-maturity Securities, Amortized Cost:    
Due within one year $ 0  
Due after one year to five years 8,230  
Due after five years to ten years 13,703  
Due after ten years 14,532  
Total 36,465 $ 27,890 [1]
Held-to-maturity Securities, Estimated Fair Value:    
Due within one year 0  
Due after one year to five years 8,290  
Due after five years to ten years 14,180  
Due after ten years 15,368  
Total 37,838 $ 29,827
Available-for-sale Securities, Amortized Cost:    
Due within one year 1,428  
Due after one year to five years 2,829  
Due after five years to ten years 19,173  
Due after ten years 45,571  
Total 69,001  
Available-for-sale Securities, Estimated Fair Value:    
Due within one year 1,421  
Due after one year to five years 2,829  
Due after five years to ten years 19,236  
Due after ten years 45,698  
Total $ 69,184  
[1] Derived from audited consolidated financial statements.