Gross Unrealized Losses and Fair Values of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 61,183
Less than 12 months, Unrealized Loss	(2,270)
12 months or more, Fair Value	1,878
12 months or more, Unrealized Loss	(1,534)
Total, Fair Value	63,061
Total, Unrealized Loss	(3,804)
Mortgage backed securities issued by U.S. Agencies
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	61,183
Less than 12 months, Unrealized Loss	(2,270)
12 months or more, Fair Value	38
12 months or more, Unrealized Loss	(1)
Total, Fair Value	61,221
Total, Unrealized Loss	(2,271)
Collateralized mortgage obligations issued by non agencies
Schedule of Available-for-sale Securities [Line Items]
12 months or more, Fair Value	1,065
12 months or more, Unrealized Loss	(61)
Total, Fair Value	1,065
Total, Unrealized Loss	(61)
Asset backed security
Schedule of Available-for-sale Securities [Line Items]
12 months or more, Fair Value	775
12 months or more, Unrealized Loss	(1,472)
Total, Fair Value	775
Total, Unrealized Loss	$ (1,472)