Other Comprehensive (Loss)/Income - Components of Other Comprehensive (Loss)/Income Include Changes in Fair Value of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income [Line Items]
Net unrealized gains/(losses) on available-for-sale securities, Pre-tax Amount	$ (31)	$ 347	$ 129	$ (388)
Reclassifications for net (gains)/ losses included in net income, Pre-tax Amount	(83)	(274)	(191)	(123)
Pre-tax Amount, Total	(114)	73	(62)	(511)
Net unrealized gains/(losses) on available-for-sale securities, Tax (Expense)/Benefit	14	(151)	(56)	169
Reclassifications for net (gains)/ losses included in net income, Tax (Expense)/Benefit	36	119	83	53
Tax (Expense)/Benefit, Total	50	(32)	27	222
Net unrealized gains/(losses) on available-for-sale securities, Net-of-tax Amount	(17)	196	73	(219)
Reclassification for net (gains)/losses included in net income, Net-of-tax Amount	(47)	(155)	(108)	(70)
Net-of-tax Amount, Total	$ (64)	$ 41	$ (35)	$ (289)