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Components of Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]                    
Current                 $ 2,037 $ 1,270
Deferred                 (478) 273
Totals $ 551 $ 218 $ 427 $ 363 $ 415 $ 451 $ 358 $ 319 $ 1,559 $ 1,543