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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Unused commitments and letters of credit [Member]
Dec. 31, 2012
Unused commitments and letters of credit [Member]
Mar. 31, 2013
Pending Litigation [Member]
Accountsholder
Mar. 31, 2013
Pending Litigation [Member]
IRA Market Rate Savings Account [Member]
Mar. 31, 2013
Pending Litigation [Member]
IRA Market Rate Savings Account [Member]
Minimum [Member]
Mar. 31, 2013
Other Matters [Member]
Mar. 31, 2013
Other Matters [Member]
Minimum [Member]
customer
Mar. 31, 2013
Other Matters [Member]
Maximum [Member]
customer
Loss Contingencies [Line Items]                    
Specified Average Age Of Account Holders         64 years          
Notional amount of financial standby letters of credit $ 36,000                  
Notional amount of performance standby letters of credit 100,000                  
Notional amount of commercial letters of credit 400.0                  
Financial instrument of credit risk 200,000 200,000                
Unfunded commitment liability     2,300,000 2,400,000            
Percentage of interest rate on deposits           3.50% 8.00%      
Number of account holders of specified average age         237          
Savings deposits         11,500,000          
Number of customers affected (in customers)                 700 900
Contingency reserve               400,000    
Estimate of possible loss in excess of reserve               $ 200,000