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Loan Receivables and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
SecurityLoan
Mar. 31, 2013
Dec. 31, 2013
SecurityLoan
Financing Receivable, Impaired [Line Items]      
Accruing interest $ 834,000   $ 866,000
Renewed loan 1   2
Accrual loans (90 days or more) had been performing 841,000    
Accrual loans (90 days or more) had been performing subsequently paid off 25,000    
Loans on nonaccrual status and considered impaired 10,200,000   12,300,000
Recorded additional income 33,000   306,000
Interest collected and recognized as income on impaired loans 113,000 125,000  
Average recorded investment in impaired loans 21,500,000    
Number of modified troubled debt restructuring loan 3   2
Troubled debt restructured loan amount 3,408,000   2,188,000
Number of Accruing loans 2    
Number of non-accruing loans 1    
Aggregating accruing loans 2,100,000    
Aggregating non-accruing loans 1,300,000    
Creditworthiness extends credit 75.00%    
Construction loans, the maximum loan-to-value 65.00%    
Construction loans are short-term loans 18 months    
Delinquency status, "Open-end" credits are charged-off 180 days    
Delinquent and "Closed-end" credits are charged-off 120 days    
Consumer installment loans are charged off no later 90 days    
Performance under loan terms 6 months    
Loans past due still accruing interest 834,000   866,000
Non-accrual loans (over 30 days but under 60 days) had been performing 25,000    
Recorded Investment, Total 20,933,000   21,993,000
Related Allowance, Total 1,800,000   1,891,000
No Related Allowance Recorded [Member]
      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, Total $ 14,000,000   $ 14,500,000