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Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Dec. 31, 2015
USD ($)
Allowance For Loan Losses [Line Items]          
TDRs performing under the restructured terms $ 162,000   $ 162,000   $ 982,000
Troubled debt restructuring loan subsequent default $ 0 $ 0 $ 0 $ 0  
Troubled debt restructuring loan subsequent default period     90 days    
Secured by 1-4 Family Residential [Member]          
Allowance For Loan Losses [Line Items]          
Loans modified under TDRs | Contract 1 0 1 0  
Pre-modification recorded investment totaled     $ 138,000    
Post-modification recorded investment totaled     88,000    
Performing Financing Receivable [Member]          
Allowance For Loan Losses [Line Items]          
TDRs performing under the restructured terms $ 88,000   $ 88,000   $ 317,000