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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
Mar. 31, 2018
USD ($)
N
Sep. 30, 2017
USD ($)
N
Investment [Line Items]    
Number of Securities | N 43 31
Less Than 12 Months, Fair Value $ 21,349 $ 12,430
Less Than 12 Months, Unrealized Losses (402) (173)
12 Months Or Greater, Fair Value 33,444 27,291
12 Months Or Greater, Unrealized Losses (1,407) (602)
Total, Fair Value 54,793 39,721
Total, Unrealized Losses $ (1,809) $ (775)
Obligations of U.S. government agencies 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 513 605
12 Months Or Greater, Unrealized Losses (97) (96)
Total, Fair Value 513 605
Total, Unrealized Losses $ (97) $ (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 924
12 Months Or Greater, Unrealized Losses (11)
Total, Fair Value 924 958
Total, Unrealized Losses $ (11) $ (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 $ 21,349 $ 6,582
Less Than 12 Months, Unrealized Losses (402) (92)
12 Months Or Greater, Fair Value 22,461 21,713
12 Months Or Greater, Unrealized Losses (743) (284)
Total, Fair Value 43,810 28,295
Total, Unrealized Losses $ (1,145) $ (376)
Obligations of U.S. government-sponsored enterprises Debt securities [Member]    
Investment [Line Items]    
Number of Securities | N 5 5
Less Than 12 Months, Fair Value $ 4,890
Less Than 12 Months, Unrealized Losses (71)
12 Months Or Greater, Fair Value 6,762 1,996
12 Months Or Greater, Unrealized Losses (202) (4)
Total, Fair Value 6,762 6,886
Total, Unrealized Losses $ (202) $ (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 137 193
12 Months Or Greater, Unrealized Losses (1) (2)
Total, Fair Value 137 193
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 2,647 2,784
12 Months Or Greater, Unrealized Losses (353) (216)
Total, Fair Value 2,647 2,784
Total, Unrealized Losses $ (353) $ (216)