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FAIR VALUE MEASUREMENTS - Quantitative Information (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Jun. 30, 2016	Sep. 30, 2015
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost		4.00%	4.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost		10.00%	10.00%
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 869,758	$ 707,774
Impaired Loans, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value		$ 77	$ 2,543
Valuation techniques	[1]	Appraised values	Appraised values
[1] The Company generally relies on external appraisers to develop this information. Management reduced the appraised value by estimated selling costs in a range of 4% to 10%.

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Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
-URI http://asc.fasb.org/extlink&oid=6517073

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