Fair Value of Financial Instruments (Details) - Level 2 - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2016	Sep. 30, 2015
Market Approach Valuation Technique | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	6.15%	6.37%
Market Approach Valuation Technique | Mortgages | Minimum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	2.15%	1.99%
Market Approach Valuation Technique | Mortgages | Maximum
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	4.61%	15.00%
Carrying and Fair Value | Junior subordinated notes
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 16,771	$ 21,400
Carrying and Fair Value | Mortgages
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 9,983	$ 890