IMPAIRMENT OF INVESTMENT SECURITIES (Schedule of Gross Unrealized Losses and Fair Value for Both Available For Sale and Held To Maturity Securities) (Details) $ in Thousands	Jun. 30, 2018 USD ($) N	Sep. 30, 2017 USD ($) N
Investment [Line Items]
Number of Securities | N	43	31
Less Than 12 Months, Fair Value	$ 16,877	$ 12,430
Less Than 12 Months, Unrealized Losses	(379)	(173)
12 Months Or Greater, Fair Value	35,095	27,291
12 Months Or Greater, Unrealized Losses	(1,776)	(602)
Total, Fair Value	51,972	39,721
Total, Unrealized Losses	$ (2,155)	$ (775)
Obligations of U.S. government agencies Mortgage backed securities - residential [Member]
Investment [Line Items]
Number of Securities | N	3	2
Less Than 12 Months, Fair Value	$ 561
Less Than 12 Months, Unrealized Losses	(2)
12 Months Or Greater, Fair Value	494	605
12 Months Or Greater, Unrealized Losses	(94)	(96)
Total, Fair Value	1,055	605
Total, Unrealized Losses	$ (96)	$ (96)
Obligations of U.S. government agencies Mortgage backed securities -commercial [Member]
Investment [Line Items]
Number of Securities | N	1	1
Less Than 12 Months, Fair Value		$ 958
Less Than 12 Months, Unrealized Losses		(10)
12 Months Or Greater, Fair Value	910
12 Months Or Greater, Unrealized Losses	(10)
Total, Fair Value	910	958
Total, Unrealized Losses	$ (10)	$ (10)
Obligations of U.S. government-sponsored enterprises Mortgage-backed securities-residential [Member]
Investment [Line Items]
Number of Securities | N	32	20
Less Than 12 Months, Fair Value	$ 16,316	$ 6,582
Less Than 12 Months, Unrealized Losses	(377)	(92)
12 Months Or Greater, Fair Value	26,266	21,713
12 Months Or Greater, Unrealized Losses	(1,011)	(284)
Total, Fair Value	42,582	28,295
Total, Unrealized Losses	$ (1,388)	$ (376)
Obligations of U.S. government-sponsored enterprises Debt securities [Member]
Investment [Line Items]
Number of Securities | N	4	5
Less Than 12 Months, Fair Value		$ 4,890
Less Than 12 Months, Unrealized Losses		(71)
12 Months Or Greater, Fair Value	4,726	1,996
12 Months Or Greater, Unrealized Losses	(237)	(4)
Total, Fair Value	4,726	6,886
Total, Unrealized Losses	$ (237)	$ (75)
Private label mortgage-backed securities-residential [Member]
Investment [Line Items]
Number of Securities | N	2	2
Less Than 12 Months, Fair Value
Less Than 12 Months, Unrealized Losses
12 Months Or Greater, Fair Value	122	193
12 Months Or Greater, Unrealized Losses	(1)	(2)
Total, Fair Value	122	193
Total, Unrealized Losses	$ (1)	$ (2)
Corporate securities [Member]
Investment [Line Items]
Number of Securities | N	1	1
Less Than 12 Months, Fair Value
Less Than 12 Months, Unrealized Losses
12 Months Or Greater, Fair Value	2,577	2,784
12 Months Or Greater, Unrealized Losses	(423)	(216)
Total, Fair Value	2,577	2,784
Total, Unrealized Losses	$ (423)	$ (216)