FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - Level 2 - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Market valuation | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	7.35%	6.82%
Market valuation | Mortgages | Minimum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	4.30%	3.78%
Market valuation | Mortgages | Maximum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	6.04%	5.02%
Estimated fair value | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 12,451,486	$ 15,705,000
Estimated fair value | Mortgages
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 34,039,000	$ 11,400,000