Fair Value of Financial Instruments and Fair Value Measurement - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)	Mar. 31, 2015	Sep. 30, 2014	Sep. 30, 2013
Other real estate owned:
Other real estate owned, non-covered	$ 1,144,112	$ 1,757,864	$ 1,615,036
Other real estate owned, covered	3,343,384	5,557,927	14,068,846
Fair Value, Inputs, Level 1
Other real estate owned:
Other real estate owned, non-covered	0	0
Other real estate owned, covered	0	0
Fair Value, Inputs, Level 2
Other real estate owned:
Other real estate owned, non-covered	0	0
Other real estate owned, covered	0	0
Fair Value, Inputs, Level 3
Other real estate owned:
Other real estate owned, non-covered	1,144,112	1,757,864
Other real estate owned, covered	3,343,384	5,557,927
Non-covered loans
Impaired loans:
Impaired loans	2,579,119	3,174,410
Non-covered loans | Fair Value, Inputs, Level 1
Impaired loans:
Impaired loans	0	0
Non-covered loans | Fair Value, Inputs, Level 2
Impaired loans:
Impaired loans	0	0
Non-covered loans | Fair Value, Inputs, Level 3
Impaired loans:
Impaired loans	$ 2,579,119	$ 3,174,410