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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Held to Maturity Securities, Amortized Cost |  |
Due within 1 year |  |
Due after 1 but within 5 years | 6,498 |
Due after 5 but within 10 years | 9,000 |
Due after 10 years |  |
Total debt securities | 15,498 |
Mortgage Backed Securities, Residential | 24,561 |
Mortgage Backed Securities, Commercial | 738 |
Amortized cost | 40,797 | $ 30,443
Held to Maturity Securities, Fair Value |  |
Due within 1 year |  |
Due after 1 but within 5 years | 6,384 |
Due after 5 but within 10 years | 8,652 |
Due after 10 years |  |
Total debt securities | 15,036 |
Mortgage Backed Securities, Residential | 24,710 |
Mortgage Backed Securities, Commercial | 738 |
Fair value | $ 40,484 | $ 30,899

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