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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Segment
Dec. 31, 2013
Loans
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of portfolio segments 8    
Related party loans and commitments $ 3,200,000 $ 3,600,000  
New loans to parties 0 1,700,000  
Repayments of loan 400,000 600,000  
Accrued interest on loans, discontinued amount 4,903,000 10,565,000  
Accrued interest on loans 100,000 600,000  
Interest income actually recorded 0 100,000  
Accruing loans past due 90 days or more amounted 1,500,000 1,700,000  
Trouble Debt restructuring Modified period term 6 months    
Period of repayment performance under the modified loan terms 6 months    
Non-accruing loans restructured and remained on nonaccrual status 4,300,000   5,700,000
Repayments of loans 0 2,000,000  
Number of loans returned to accrual status   1  
Restructured loans on accrual status 1,400,000    
Troubled debt restructuring evaluated impairment 500,000 500,000  
Allowance for loans losses 0 800,000  
Real Estate [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of loan portfolio 70.10% 69.20%  
Minimum [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loan amount threshold for impairment analysis $ 500,000