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Allowance for Loan Losses - Additional Information (Detail)
9 Months Ended
Sep. 30, 2019
USD ($)
Contracts
Contract
Sep. 30, 2018
USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]    
Specific reserves $ 88,000 $ 538,000
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   350,000
Troubled debt restructurings, subsequently defaulted   $ 2,675,000
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