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Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Contracts
Sep. 30, 2015
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]        
Troubled debt restructurings, subsequently defaulted $ 0 $ 0 $ 0 $ 0
Commercial Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Number of troubled debt restructurings | Contracts     1  
Pre-modification outstanding recorded investment     $ 2,091,000  
Post-modification outstanding recorded investment     2,091,000  
Financing allowance reduction in principal payments 7,000   10,000  
Financing allowance reduction in interest payments $ 2,000   $ 2,000