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FAIR VALUE MEASUREMENTS - Quantitative Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	4.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	10.00%
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 1,214,592	$ 926,803
Impaired Loans, Net [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	0	68
Foreclosed Assets [Member] | Level 3 [Member] | Market Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 364	$ 76

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- Definition

Refers to range of estimated selling cost used in appraised value to develop quantitative information.

+ References

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- Definition

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- Definition

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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