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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Held to Maturity Securities, Amortized Cost |  |
Due within 1 year |  |
Due after 1 but within 5 years | 1,499 |
Due after 5 but within 10 years | 3,966 |
Due after 10 years |  |
Total debt securities | 5,465 |
Mortgage Backed Securities, Residential | 28,199 |
Mortgage Backed Securities, Commercial | 889 |
Amortized cost | 34,553 | $ 33,645
Held to Maturity Securities, Fair Value |  |
Due within 1 year |  |
Due after 1 but within 5 years | 1,483 |
Due after 5 but within 10 years | 3,474 |
Due after 10 years |  |
Total debt securities | 4,957 |
Mortgage Backed Securities, Residential | 27,630 |
Mortgage Backed Securities, Commercial | 880 |
Fair value | $ 33,467 | $ 32,151

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