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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Held to Maturity Securities, Amortized Cost
Due within 1 year	$ 2,000
Due after 1 but within 5 years	1,499
Due after 5 but within 10 years	3,000
Due after 10 years	964
Total debt securities	7,463
Mortgage Backed Securities, Residential	28,683
Mortgage Backed Securities, Commercial	936
Amortized cost	37,082	$ 51,368
Held to Maturity Securities, Fair Value
Due within 1 year	1,999
Due after 1 but within 5 years	1,470
Due after 5 but within 10 years	2,647
Due after 10 years	911
Total debt securities	7,027
Mortgage Backed Securities, Residential	27,899
Mortgage Backed Securities, Commercial	925
Fair value	$ 35,851	$ 51,241

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Fair value of mortgage-backed commercial debt securities categorized as held-to-maturity.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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