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Loans and Leases - Troubled Debt Restructured Loans (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 2 6
Pre- Restructuring Outstanding Recorded Investment $ 1,960 $ 1,898
Post- Restructuring Outstanding Recorded Investment 1,960 1,898
Related Reserve $ 0 $ 0
Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 3 1
Pre- Restructuring Outstanding Recorded Investment $ 499 $ 122
Post- Restructuring Outstanding Recorded Investment 498 122
Related Reserve $ 0 $ 22
Commercial, Financial and Agricultural [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 1 4
Pre- Restructuring Outstanding Recorded Investment $ 1,545 $ 1,140
Post- Restructuring Outstanding Recorded Investment 1,545 1,140
Related Reserve $ 0 $ 0
Commercial, Financial and Agricultural [Member] | Nonaccrual Troubled Debt Restructured Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 122
Post- Restructuring Outstanding Recorded Investment 0 122
Related Reserve $ 0 $ 22
Real Estate-Commercial [Member] | Accrual Troubled Debt Restructuring Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | loan 0 1
Pre- Restructuring Outstanding Recorded Investment $ 0 $ 405
Post- Restructuring Outstanding Recorded Investment 0 405
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 1 1
Pre- Restructuring Outstanding Recorded Investment $ 415 $ 353
Post- Restructuring Outstanding Recorded Investment 415 353
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 1 0
Pre- Restructuring Outstanding Recorded Investment $ 313 $ 0
Post- Restructuring Outstanding Recorded Investment 312 0
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 1 0
Pre- Restructuring Outstanding Recorded Investment $ 34 $ 0
Post- Restructuring Outstanding Recorded Investment 34 0
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 1 0
Pre- Restructuring Outstanding Recorded Investment $ 152 $ 0
Post- Restructuring Outstanding Recorded Investment 152 0
Related Reserve $ 0 $ 0