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Loans and Leases - Troubled Debt Restructured Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 2
Pre- Restructuring Outstanding Recorded Investment $ 9,206 $ 1,960
Post- Restructuring Outstanding Recorded Investment 9,206 1,960
Related Reserve $ 0 $ 0
Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 3
Pre- Restructuring Outstanding Recorded Investment $ 1,455 $ 499
Post- Restructuring Outstanding Recorded Investment 1,455 498
Related Reserve $ 0 $ 0
Commercial, Financial and Agricultural [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 1,545
Post- Restructuring Outstanding Recorded Investment 0 1,545
Related Reserve $ 0 $ 0
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 0
Pre- Restructuring Outstanding Recorded Investment $ 1,127 $ 0
Post- Restructuring Outstanding Recorded Investment 1,127 0
Related Reserve $ 0 $ 0
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 0
Pre- Restructuring Outstanding Recorded Investment $ 9,206 $ 0
Post- Restructuring Outstanding Recorded Investment 9,206 0
Related Reserve $ 0 $ 0
Real Estate-Commercial [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 0
Pre- Restructuring Outstanding Recorded Investment $ 328 $ 0
Post- Restructuring Outstanding Recorded Investment 328 0
Related Reserve $ 0 $ 0
Real Estate-Residential Secured for Business Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 415
Post- Restructuring Outstanding Recorded Investment 0 415
Related Reserve $ 0 $ 0
Real Estate-Residential Secured for Business Purpose [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 313
Post- Restructuring Outstanding Recorded Investment 0 312
Related Reserve $ 0 $ 0
Real Estate-Residential Secured for Personal Purpose [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 34
Post- Restructuring Outstanding Recorded Investment 0 34
Related Reserve $ 0 $ 0
Real Estate-Home Equity Secured for Personal Purpose [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 152
Post- Restructuring Outstanding Recorded Investment 0 152
Related Reserve $ 0 $ 0