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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Stock Options
Dec. 31, 2012
Stock Options
Dec. 31, 2013
Stock Options
Maximum
Dec. 31, 2009
2009 Equity Incentive Plan
Dec. 31, 2013
2009 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares authorized                           223,000  
Options granted expiration period                           10 years  
Options outstanding                     0 0     0
Aggregate fair value of stock for which any optionee may be granted incentive options which are first exercisable during any calendar year                         $ 100,000    
Stock options exercised                     0 0      
Options granted during the period                     0 0      
Compensation expense recognized                     0 0      
Unrecognized compensation expense related to nonvested stock options to be recognized over the remaining vesting period                     0 0      
Income tax benefit $ 534,000 $ 653,000 $ 557,000 $ 511,000 $ 551,000 $ 218,000 $ 427,000 $ 363,000 $ 2,255,000 $ 1,559,000 $ 0 $ 0