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INVESTMENT SECURITIES (Summary of Maturities of Debt Securities and Mortgage-backed Securities Held to Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Held to maturity securities |  |
Amortized cost | $ 34,510 | $ 51,368
Gross Unrealized Gains | 43 | 472
Gross Unrealized Losses | (766) | (599)
Fair Value | 33,787 | 51,241
Obligations of U.S. government agencies Mortgage backed securities - residential [Member] |  |
Held to maturity securities |  |
Amortized cost | 631 | 3,466
Gross Unrealized Gains |  | 123
Gross Unrealized Losses | (97) | (96)
Fair Value | 534 | 3,493
Obligations of U.S. government agencies Mortgage backed securities -commercial [Member] |  |
Held to maturity securities |  |
Amortized cost | 951 | 968
Gross Unrealized Gains |  |
Gross Unrealized Losses | (9) | (10)
Fair Value | 942 | 958
Obligations of U.S. government-sponsored enterprises Mortgage-backed securities-residential [Member] |  |
Held to maturity securities |  |
Amortized cost | 25,014 | 39,016
Gross Unrealized Gains | 43 | 349
Gross Unrealized Losses | (334) | (251)
Fair Value | 24,723 | 39,114
Obligations of U.S. government-sponsored enterprises Debt securities [Member] |  |
Held to maturity securities |  |
Amortized cost | 4,462 | 4,461
Gross Unrealized Gains |  |
Gross Unrealized Losses | (34) | (24)
Fair Value | 4,428 | 4,437
Private label mortgage-backed securities-residential [Member] |  |
Held to maturity securities |  |
Amortized cost | 452 | 457
Gross Unrealized Gains |  |
Gross Unrealized Losses | (2) | (2)
Fair Value | 450 | 455
Corporate securities [Member] |  |
Held to maturity securities |  |
Amortized cost | 3,000 | 3,000
Gross Unrealized Gains |  |
Gross Unrealized Losses | (290) | (216)
Fair Value | $ 2,710 | $ 2,784

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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