Securities - Association's Investments Gross Unrealized Losses and Fair Value of Association's Investments with Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Less than 12 Months, Fair Value	$ 5,191	$ 2,069
Less than 12 Months, Unrealized Losses	(32)	(2)
12 Months or More, Fair Value
12 Months or More, Unrealized Losses
Total Fair Value	5,191	2,069
Total Unrealized Losses	(32)	(2)
Mortgage-backed GSE - residential [Member]
Less than 12 Months, Fair Value	4,144	2,069
Less than 12 Months, Unrealized Losses	(16)	(2)
12 Months or More, Fair Value
12 Months or More, Unrealized Losses
Total Fair Value	4,144	2,069
Total Unrealized Losses	(16)	(2)
State and political subdivisions [Member]
Less than 12 Months, Fair Value	1,047
Less than 12 Months, Unrealized Losses	(16)
12 Months or More, Fair Value
12 Months or More, Unrealized Losses
Total Fair Value	1,047
Total Unrealized Losses	$ (16)