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Loans - Summary of Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Modifications [Line Items]    
Nonaccrual loans, other than troubled debt restructurings $ 1,093 $ 1,416
Total nonperforming loans (NPLs) 1,417 2,013
Accruing Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings 435 466
Non Accruing Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings $ 324 $ 597