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Calculations of Basic and Diluted Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share Disclosure [Line Items]      
Income before extraordinary item $ 20,947 $ 14,066 $ 17,784
Extraordinary item, net of taxes     2,477
Net income - Basic and Diluted $ 20,947 $ 14,066 $ 20,261
Weighted-average shares outstanding - Basic 12,511 12,128 12,036
Effect of dilutive securities:      
Stock options 299 401 340
Weighted-average shares outstanding - Diluted 12,810 12,529 12,376
Basic income per common share before extraordinary item $ 1.67 $ 1.16 $ 1.48
Basic income per common share of extraordinary item     $ 0.20
Basic income per common share $ 1.67 $ 1.16 $ 1.68
Diluted income per common share before extraordinary item $ 1.64 $ 1.12 $ 1.44
Diluted income per common share of extraordinary item     $ 0.20
Diluted income per common share $ 1.64 $ 1.12 $ 1.64