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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Valuation, Market Approach | Minimum | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	0.04
Valuation, Market Approach | Maximum | Measurement Input, Discount Rate
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	0.90
Level 3
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loans, Net	$ 3,616,646	$ 3,307,037
Impaired Loans | Level 3 | Valuation, Market Approach
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loans, Net	$ 12,775	9,260
Impaired Loans | Level 3 | Valuation, Market Approach | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	4.00%
Impaired Loans | Level 3 | Valuation, Market Approach | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	90.00%
Foreclosed Assets | Level 3 | Valuation, Market Approach
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loans, Net	$ 2,077	$ 9,957
Foreclosed Assets | Level 3 | Valuation, Market Approach | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	4.00%
Foreclosed Assets | Level 3 | Valuation, Market Approach | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range of estimated selling cost	30.00%

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Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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