Loans Receivable - Allowance for Covered Loan Losses Transactions (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses			$ 0	$ (1,549,966)
Covered loans
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for loan losses - beginning balance	1,012,679	3,434,733	997,524	3,924,278
Loans charged off, gross	0	168,861	64,853	138,885
Recoveries on loans previously charged off	13,635	75,988	13,643	84,150
Allowance for loan losses - ending balance	946,314	2,268,000	946,314	2,268,000
Covered loans | Charged to FDIC receivable
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses	(76,000)	(1,020,167)	0	(1,549,966)
Covered loans | Charged to operations
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan losses	$ (4,000)	$ (53,693)	$ 0	$ (51,577)