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Share-Based Payments - Restricted Stock Unit Activity (Detail) (Restricted Stock Units [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested, beginning of period, shares 41,177
Granted, shares 15,671
Vested, shares (13,281)
Reinvested dividend equivalents, shares 1,740
Forfeited, shares (3,367)
Nonvested, end of period, shares 41,940
Nonvested, beginning of period, weighted-average grant date fair value per share $ 17.57
Granted, weighted-average grant date fair value per share $ 18.91
Vested, weighted-average grant date fair value per share $ 20.99
Reinvested dividend equivalents, weighted-average grant date fair value per share $ 19.28
Forfeited, weighted-average grant date fair value per share $ 17.27
Nonvested, end of period, weighted-average grant date fair value per share $ 17.08