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Reconciliation of Income Tax Expense at Statutory Rate to Company's Actual Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 30, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 30, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]                    
Computed at the statutory rate (34%)                 $ 1,001 $ 1,341
(Decrease) increase resulting from Tax exempt interest                 (231) (356)
Earnings on bank-owned life insurance - net                 (156) (187)
Other                 (68) 56
Actual tax expense $ 123 $ 118 $ 234 $ 71 $ 260 $ 260 $ 168 $ 166 $ 546 $ 854