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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Loans
Sep. 30, 2016
Loans
Sep. 30, 2017
USD ($)
Loans
Sep. 30, 2016
Loans
Dec. 31, 2016
Loans
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     18   15
Commercial, Industrial, and Agricultural [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     8   7
Commercial Mortgages [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     10   8
Residential Real Estate [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0   0
Consumer [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0   0
Credit Cards [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0   0
Trouble Debt Restructuring [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans 4 0 4 0  
Pre-Modification Outstanding Recorded Investment | $     $ 6,551    
Post-Modification Outstanding Recorded Investment | $     $ 6,655    
Trouble Debt Restructuring [Member] | Commercial, Industrial, and Agricultural [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     2    
Pre-Modification Outstanding Recorded Investment | $     $ 324    
Post-Modification Outstanding Recorded Investment | $     $ 379    
Trouble Debt Restructuring [Member] | Commercial Mortgages [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     2    
Pre-Modification Outstanding Recorded Investment | $     $ 6,227    
Post-Modification Outstanding Recorded Investment | $     $ 6,276    
Trouble Debt Restructuring [Member] | Residential Real Estate [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0    
Pre-Modification Outstanding Recorded Investment | $     $ 0    
Post-Modification Outstanding Recorded Investment | $     $ 0    
Trouble Debt Restructuring [Member] | Consumer [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0    
Pre-Modification Outstanding Recorded Investment | $     $ 0    
Post-Modification Outstanding Recorded Investment | $     $ 0    
Trouble Debt Restructuring [Member] | Credit Cards [Member]          
Schedule Of Financial Receivables [Line Items]          
Number of Loans | Loans     0    
Pre-Modification Outstanding Recorded Investment | $     $ 0    
Post-Modification Outstanding Recorded Investment | $     $ 0