Fair Value of Financial Instruments (Details) - Level 2 [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015
Market Approach Valuation Technique [Member] | Junior subordinated notes [Member]
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	6.11%	6.37%
Market Approach Valuation Technique [Member] | Mortgages [Member] | Minimum [Member]
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	3.28%	1.99%
Market Approach Valuation Technique [Member] | Mortgages [Member] | Maximum [Member]
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	4.71%	15.00%
Market Approach Valuation Technique [Member] | Other borrowings [Member] | Minimum [Member]
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	4.00%
Market Approach Valuation Technique [Member] | Other borrowings [Member] | Maximum [Member]
Financial Instruments Not Measured at Fair Value
Market interest rate (as a percent)	5.24%
Carrying and Fair Value [Member] | Junior subordinated notes [Member]
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 19,948	$ 21,400
Carrying and Fair Value [Member] | Mortgages [Member]
Financial Instruments Not Measured at Fair Value
Estimated fair value lower than carrying value	$ 5,246	$ 890