Securities - Securities With Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 23, 2011
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 2,882
Less than Twelve Months, Unrealized Loss	16
Twelve Months or More than Twelve Months, Fair Value	0
Twelve Months or More than Twelve Months,Unrealized Loss	0
Total, Fair Value	2,882
Total, Unrealized Loss	16
Collateralized mortgage obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	2,882
Less than Twelve Months, Unrealized Loss	16
Total, Fair Value	2,882
Total, Unrealized Loss	$ 16