Fair Value - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012
Fair Value Measurement [Line Items]
Discount for selling costs	9.00%		9.00%
Additional discount is applied to properties	10.00%		10.00%
Principal balance on collateral loans	$ 19,300,000		$ 19,300,000		$ 26,300,000
Valuation allowance on impaired loans	800,000		800,000		1,400,000
Provision for impaired loan losses	0	2,000,000	600,000	5,500,000
Principal balance impaired charge-offs			6,100,000		9,700,000
Mortgage servicing rights fair value	6,500,000		6,500,000		6,500,000
Impairment charge on mortgage			765,858	698,468
Other real estate carrying amount	7,251,163		7,251,163		7,733,578
Net loss recognized on other real estate	(65,662)	(209,813)	(182,703)	(453,770)
Provision on other real estate owned losses	500,000	400,000	1,000,000	1,300,000
Changes in fair value			(460,649)	215,785
Outstanding [Member]
Fair Value Measurement [Line Items]
Mortgage servicing rights fair value, outstanding	7,900,000		7,900,000		7,300,000
Mortgage servicing rights [Member]
Fair Value Measurement [Line Items]
Valuation allowance on mortgage	1,400,000		1,400,000		800,000
Tranches [Member]
Fair Value Measurement [Line Items]
Impairment charge on mortgage	$ 200,000	$ 100,000	$ 500,000	$ 600,000