Condensed Parent Company Financial Statements (Condensed Statements of Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Interest expense	$ (677)	$ (766)	$ (828)	$ (894)	$ (917)	$ (974)	$ (1,078)	$ (1,117)	$ (3,165)	$ (4,086)
Noninterest expense	(2,793)	(2,906)	(2,880)	(2,455)	(2,713)	(2,863)	(2,880)	(2,626)	(11,034)	(11,082)
Loss before income taxes	753	900	702	615	691	604	926	1,245	2,970	3,466
Income tax benefit	(148)	(242)	(215)	(187)	(209)	(196)	(282)	(369)	(792)	(1,056)
Net income	605	658	487	428	482	408	644	876	2,178	2,410
Bank [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Interest income									430	467
Interest expense									(96)	(191)
Noninterest expense									(778)	(389)
Loss before income taxes									(444)	(113)
Income tax benefit									(117)	(35)
Loss before equity in undistributed earnings of American Federal Savings Bank									(327)	(78)
Equity in undistributed earnings of American Federal Savings Bank									2,505	2,488
Net income									$ 2,178	$ 2,410