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Non-performing Loans and Impaired Loans - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2016
USD ($)
ConsecutivePayment
Contract
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]    
Non-accrual loans $ 10,091,000 $ 12,262,000
Non-performing TDRs 1,500,000  
Loans acquired included in non-accrual loans 1,200,000  
Loans acquired included in non-performing TDRs $ 238,000  
Loan delinquency period 90 days  
Restructured loans with modified recorded balances $ 0  
Restructured loan returned to accruing status number of Consecutive Payments of loan | ConsecutivePayment 6  
Restructured loan reported in TDRs $ 2,700,000  
Specific reserves allocated to troubled debt restructuring $ 84,000  
Number TDRs returned to accrual status | Contract 0  
Loans classified as TDR after a period 90 days  
Performing Financing Receivable [Member]    
Financing Receivable, Modifications [Line Items]    
Restructured loan $ 1,500,000  
Good Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit Unaudited Financial Information for Good Pass Rating 5 years  
Number of years of Satisfactory Relationship with bank for Good Pass Rating 5 years  
Minimum [Member]    
Financing Receivable, Modifications [Line Items]    
Loan delinquency period 90 days  
Delay or shortfall in payments of loan 30 days  
Loans with an aggregate credit exposure $ 1,000,000  
Minimum [Member] | Good Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Number of consecutive years of profit for Good Pass Rating 3 years  
Minimum [Member] | Satisfactory Pass [Member]    
Financing Receivable, Modifications [Line Items]    
Minimum number of years of Satisfactory Repayment required for Satisfactory Pass Rating 2 years  
Maximum [Member]    
Financing Receivable, Modifications [Line Items]    
Loans with an aggregate credit exposure $ 2,500,000