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FAIR VALUE DISCLOSURES (Schedule of the Carrying Amount, Fair Value, and Placement in the Fair Value Hierarchy of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Financial instruments - assets |  |
Investment securities held to maturity | $ 34,510 | $ 51,368
Fair Value, Inputs, Level 1 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity |  |
Loans |  |
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates |  |
Borrowings |  |
Fair Value, Inputs, Level 2 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 33,787 | 51,241
Loans |  |
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 123,939 | 128,750
Borrowings | 31,623 | 31,865
Fair Value, Inputs, Level 3 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity |  |
Loans | 479,001 | 473,538
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates |  |
Borrowings |  |
Carrying Value [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 34,510 | 51,368
Loans | 478,201 | 470,693
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 123,352 | 128,028
Borrowings | 31,905 | 31,905
Fair Value [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 33,787 | 51,241
Loans | 479,001 | 473,538
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 123,939 | 128,750
Borrowings | $ 31,623 | $ 31,865

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