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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, 2019
USD ($)
N
Sep. 30, 2018
USD ($)
N
Investment [Line Items]    
Number of Securities | N 37 44
Less Than 12 Months, Fair Value $ 1,615 $ 11,868
Less Than 12 Months, Unrealized Losses (6) (320)
12 Months Or Greater, Fair Value 42,051 39,374
12 Months Or Greater, Unrealized Losses (948) (1,988)
Total, Fair Value 43,666 51,242
Total, Unrealized Losses $ (954) $ (2,308)
Obligations of U.S. government agencies Mortgage backed securities - residential [Member]    
Investment [Line Items]    
Number of Securities | N 2 3
Less Than 12 Months, Fair Value $ 532
Less Than 12 Months, Unrealized Losses (8)
12 Months Or Greater, Fair Value 394 475
12 Months Or Greater, Unrealized Losses (84) (93)
Total, Fair Value 394 1,007
Total, Unrealized Losses $ (84) $ (101)
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
Less Than 12 Months, Unrealized Losses
12 Months Or Greater, Fair Value 864 895
12 Months Or Greater, Unrealized Losses (9) (9)
Total, Fair Value 864 895
Total, Unrealized Losses $ (9) $ (9)
Obligations of U.S. government-sponsored enterprises Mortgage-backed securities-residential [Member]    
Investment [Line Items]    
Number of Securities | N 29 34
Less Than 12 Months, Fair Value $ 1,615 $ 11,336
Less Than 12 Months, Unrealized Losses (6) (312)
12 Months Or Greater, Fair Value 34,663 30,605
12 Months Or Greater, Unrealized Losses (427) (1,217)
Total, Fair Value 36,278 41,941
Total, Unrealized Losses $ (433) $ (1,529)
Obligations of U.S. government-sponsored enterprises Debt securities [Member]    
Investment [Line Items]    
Number of Securities | N 3 4
Less Than 12 Months, Fair Value
Less Than 12 Months, Unrealized Losses
12 Months Or Greater, Fair Value 3,386 4,683
12 Months Or Greater, Unrealized Losses (81) (281)
Total, Fair Value 3,386 4,683
Total, Unrealized Losses $ (81) $ (281)
Private label mortgage-backed securities-residential [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 91 104
12 Months Or Greater, Unrealized Losses
Total, Fair Value 91 104
Total, Unrealized Losses
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 2,653 2,612
12 Months Or Greater, Unrealized Losses (347) (388)
Total, Fair Value 2,653 2,612
Total, Unrealized Losses $ (347) $ (388)