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Loans - Summary of Nonperforming Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Financing Receivable, Modifications [Line Items]    
Nonaccrual loans, other than troubled debt restructurings $ 868 $ 906
Total nonperforming loans (NPLs) 1,475 1,555
Accruing Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Restructured loans 449 459
Non Accruing Loan [Member]    
Financing Receivable, Modifications [Line Items]    
Restructured loans $ 607 $ 649