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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Held to Maturity Securities, Amortized Cost |  |
Due within 1 year | $ 2,000 |
Due after 1 but within 5 years | 1,499 |
Due after 5 but within 10 years | 3,000 |
Due after 10 years | 964 |
Total debt securities | 7,463 |
Mortgage Backed Securities, Residential | 28,683 |
Mortgage Backed Securities, Commercial | 936 |
Amortized cost | 37,082 | $ 51,368
Held to Maturity Securities, Fair Value |  |
Due within 1 year | 1,999 |
Due after 1 but within 5 years | 1,470 |
Due after 5 but within 10 years | 2,647 |
Due after 10 years | 911 |
Total debt securities | 7,027 |
Mortgage Backed Securities, Residential | 27,899 |
Mortgage Backed Securities, Commercial | 925 |
Fair value | $ 35,851 | $ 51,241

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