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Stock-based Payment Arrangements - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Two Thousand Nine Stock Option Plan [Member]
Dec. 31, 2012
Two Thousand Nine Stock Option Plan [Member]
Dec. 31, 2011
Two Thousand Nine Stock Option Plan [Member]
Dec. 31, 2013
Two Thousand Nine Stock Option Plan [Member]
Employee Stock Option [Member]
Dec. 31, 2013
Recognition and Retention Plan [Member]
Dec. 31, 2009
Recognition and Retention Plan [Member]
Dec. 31, 2013
Recognition and Retention Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
Recognition and Retention Plan [Member]
Restricted Stock [Member]
Dec. 31, 2011
Recognition and Retention Plan [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Maximum option term 10 years                
Stock option vesting period 5 years                
Maximum number of shares issuable under the SOP       892,687 357,075        
Shares outstanding under the SOP       850,020          
Unrecognized compensation cost $ 497,000       $ 493,000        
Unrecognized compensation cost, period for recognition 2 years 2 months 12 days       5 years        
Compensation and benefits expense 681,000 663,000 626,000       793,000 802,000 771,000
Percent of outstanding common to be approved for restricted stock awards under the RRP         4.00%        
Average cost of shares in open market required to fund the RRP           $ 11.81      
Total cost of shares held by the RRP         $ 1,018,000