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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Multiplier
Dec. 31, 2012
Jan. 17, 2014
Subsequent Event [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Restricted Stock Awards [Member]
Dec. 31, 2012
Restricted Stock Awards [Member]
Dec. 31, 2011
Restricted Stock Awards [Member]
Summary Of Significant Accounting Policies [Line Items]              
Maturity period of cash equivalents       3 months      
Period for federal funds purchased and sold 1 day            
Average aggregate reserve $ 6.5 $ 4.9          
Loan non-accrual classification period 90 days            
Days to charged consumer loans to the value of the collateral 120 days            
Maximum time for re-evaluation (in months) 12 months            
Re-evaluation period for real estate 2 years            
Excess fair value of goodwill amount 19            
Percentage of carrying value for excess fair value 20.40%            
Factor multiplication of value of goodwill 5            
Other real estate owned $ 2.1 $ 2.3          
Shares of anti-dilutive restricted stock awards         31,890 30,670 29,715
Stock Repurchase Program, Number of Shares Authorized to be Repurchased     200,000