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Loans and Allowance for Loan and Lease Losses (Average Recorded Investment Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Home Equity [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment $ 90 $ 66 $ 101 $ 53 $ 75 $ 107 $ 29
Impaired Loans with No Allowance: Interest Income Recognized     2        
Impaired Loans with Allowance: Average Recorded Investment   17   19 32   76
Impaired Financing Receivable, Average Recorded Investment, Total 90 83 101 72 107 107 105
Impaired Financing Receivable, Interest Income Recognized, Total     2     3  
Commercial Portfolio [Member] | Commercial and Industrial [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 36 11 18 14 9 19 72
Impaired Loans with Allowance: Average Recorded Investment   59   61 59 123 93
Impaired Financing Receivable, Average Recorded Investment, Total 36 70 18 75 68 142 165
Impaired Financing Receivable, Interest Income Recognized, Total           205  
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Interest Income Recognized           205  
Commercial Portfolio [Member] | Commercial Real Estate [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 644 960 524 1,001 820 1,051 1,966
Impaired Loans with No Allowance: Interest Income Recognized     279     14 346
Impaired Loans with Allowance: Average Recorded Investment 2,792 2,201 2,660 1,851 2,177 1,721 6,823
Impaired Financing Receivable, Average Recorded Investment, Total 4,080 4,104 3,922 3,786 3,807 3,698 8,789
Impaired Financing Receivable, Interest Income Recognized, Total 110   389   164 364 346
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 644 943 738 934 810 926  
Impaired Loans with No Allowance: Interest Income Recognized 110   110   164 350  
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 473   313   124    
Impaired Loans with Allowance: Average Recorded Investment 240   144   48    
Impaired Financing Receivable, Average Recorded Investment, Total 713   457   172    
Residential Portfolio [Member] | Residential Mortgage [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 860 831 843 777 821 816 541
Impaired Loans with No Allowance: Interest Income Recognized 7 7 18 9 21 8  
Impaired Loans with Allowance: Average Recorded Investment 66   40   14 25  
Impaired Financing Receivable, Average Recorded Investment, Total 1,252 1,208 1,233 1,152 1,213 1,241 $ 541
Impaired Financing Receivable, Interest Income Recognized, Total 9 7 18 13 25 8  
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Average Recorded Investment 326 $ 377 $ 350 375 378 400  
Impaired Loans with No Allowance: Interest Income Recognized $ 2     $ 4 $ 4    
Consumer Portfolio [Member] | Home Equity [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]              
Financing Receivable, Impaired [Line Items]              
Impaired Loans with No Allowance: Interest Income Recognized           $ 3