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Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Contracts
Contract
Financing Receivable, Allowance for Credit Losses [Line Items]    
Specific reserves $ 713,000 $ 333,000
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 $ 575,000 $ 575,000
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