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Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule Of Significant Accounting Policies [Line Items]        
Number of days past due when interest income on commercial and mortgage loans is discontinued     90 days  
Maximum number of days past due when consumer and credit card loans are typically charged off     120 days  
Restricted shares [Member]
        
Schedule Of Significant Accounting Policies [Line Items]        
Unvested restricted shares included in determining basic and diluted earnings per share 64,000 38,000 64,000 38,000
Stock options [Member]
        
Schedule Of Significant Accounting Policies [Line Items]        
Stock options included in determining diluted earnings per share 54,000 26,000 54,000 21,000
Stock options antidilutive and not included in determining diluted earnings per share 94,000 137,000 94,000 142,000
Stock warrant [Member]
        
Schedule Of Significant Accounting Policies [Line Items]        
Stock warrant included in determining diluted earnings per share   616,000   616,000