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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Held to Maturity Securities, Amortized Cost |  |
Due within 1 year |  |
Due after 1 but within 5 years |  |
Due after 5 but within 10 years | 3,000 |
Due after 10 years |  |
Total debt securities | 3,000 |
Mortgage Backed Securities, Residential | 24,277 |
Mortgage Backed Securities, Commercial | 793 |
Amortized cost | 28,070 | $ 29,481
Held to Maturity Securities, Fair Value |  |
Due within 1 year |  |
Due after 1 but within 5 years |  |
Due after 5 but within 10 years | 2,745 |
Due after 10 years |  |
Total debt securities | 2,745 |
Mortgage Backed Securities, Residential | 25,008 |
Mortgage Backed Securities, Commercial | 785 |
Fair value | $ 28,538 | $ 29,344

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- Definition Carrying amount of mortgage-backed commercial debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments. + References No definition available. + Details
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