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Loans and Leases - Troubled Debt Restructured Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Investment
Dec. 31, 2018
USD ($)
loan
Investment
Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | loan 1 0
Pre-restructuring outstanding recorded investment $ 55 $ 0
Post-restructuring outstanding recorded investment 55 0
Related allowance $ 0 $ 0
Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | loan 6 1
Pre-restructuring outstanding recorded investment $ 13,889 $ 66
Post-restructuring outstanding recorded investment 13,889 66
Related allowance $ 0 $ 0
Real Estate-Residential Secured for Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | Investment 1 0
Pre-restructuring outstanding recorded investment $ 55 $ 0
Post-restructuring outstanding recorded investment 55 0
Related allowance $ 0 $ 0
Real Estate-Residential Secured for Personal Purpose [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | loan 0 1
Pre-restructuring outstanding recorded investment $ 0 $ 66
Post-restructuring outstanding recorded investment 0 66
Related allowance $ 0 $ 0
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | loan 4 0
Pre-restructuring outstanding recorded investment $ 1,475 $ 0
Post-restructuring outstanding recorded investment 1,475 0
Related allowance $ 0 $ 0
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Troubled Debt Restructuring [Line Items]    
Number of loans | loan 2 0
Pre-restructuring outstanding recorded investment $ 12,414 $ 0
Post-restructuring outstanding recorded investment 12,414 0
Related allowance $ 0 $ 0