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Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
Contracts
Contract
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]      
Specific reserves $ 100,000 $ 686,000 $ 145,000
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Number of troubled debt restructurings | Contracts 1    
Post-modification outstanding recorded investment   2,675,000  
Specific reserves   580,000  
Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Number of troubled debt restructurings | Contract 1    
Pre-modification outstanding recorded investment   17,000  
Post-modification outstanding recorded investment   17,000  
Specific reserves   $ 1,000