Loans Receivable - Accretable Discount On Covered Loans (Details) (Covered loans, USD $)	6 Months Ended	12 Months Ended
	Mar. 31, 2015	Sep. 30, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total covered loans - beginning balance	$ 5,843,697	$ 4,673,371
Loan accretion	(2,899,135)	(6,558,534)
Transfer from nonaccretable difference	1,265,139	7,728,860
Total covered loans - ending balance	4,209,701	5,843,697
Impaired loans at acquisition
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total covered loans - beginning balance	3,073,198	3,508,430
Loan accretion	(1,507,466)	(3,979,390)
Transfer from nonaccretable difference	1,200,000	3,544,158
Total covered loans - ending balance	2,765,732	3,073,198
All other acquired loans
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Total covered loans - beginning balance	2,770,499	1,164,941
Loan accretion	(1,391,669)	(2,579,144)
Transfer from nonaccretable difference	65,139	4,184,702
Total covered loans - ending balance	$ 1,443,969	$ 2,770,499