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INVESTMENT SECURITIES (Summary of Amortized Cost and Fair Values of Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Held to Maturity Securities, Amortized Cost
Due within 1 year	$ 2,000
Due after 1 but within 5 years
Due after 5 but within 10 years	4,499
Due after 10 years	963
Total debt securities	7,462
Mortgage Backed Securities, Residential	26,097
Mortgage Backed Securities, Commercial	951
Amortized cost	34,510	$ 51,368
Held to Maturity Securities, Fair Value
Due within 1 year	1,997
Due after 1 but within 5 years
Due after 5 but within 10 years	4,204
Due after 10 years	937
Total debt securities	7,138
Mortgage Backed Securities, Residential	25,707
Mortgage Backed Securities, Commercial	942
Fair value	$ 33,787	$ 51,241

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

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

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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