INVESTMENT SECURITIES (Summary of Maturities of Debt Securities and Mortgage-backed Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 34,342	$ 51,368
Gross Unrealized Gains	5	472
Gross Unrealized Losses	(1,442)	(599)
Fair Value	32,905	51,241
Obligations of U.S. government agencies Mortgage backed securities - residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	588	3,466
Gross Unrealized Gains		123
Gross Unrealized Losses	(94)	(96)
Fair Value	494	3,493
Obligations of U.S. government agencies Mortgage backed securities -commercial [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	920	968
Gross Unrealized Gains
Gross Unrealized Losses	(10)	(10)
Fair Value	910	958
Obligations of U.S. government-sponsored enterprises Mortgage-backed securities-residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	26,959	39,016
Gross Unrealized Gains	4	349
Gross Unrealized Losses	(806)	(251)
Fair Value	26,157	39,114
Obligations of U.S. government-sponsored enterprises Debt securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	2,464	4,461
Gross Unrealized Gains
Gross Unrealized Losses	(108)	(24)
Fair Value	2,356	4,437
Private label mortgage-backed securities-residential [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	411	457
Gross Unrealized Gains	1
Gross Unrealized Losses	(1)	(2)
Fair Value	411	455
Corporate securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	3,000	3,000
Gross Unrealized Gains
Gross Unrealized Losses	(423)	(216)
Fair Value	$ 2,577	$ 2,784