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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Home Equity [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment $ 327 $ 111 $ 115
Impaired Loans with No Allowance: Unpaid Principal Balance 369 129 137
Impaired Loans with Allowance: Recorded Investment   29  
Impaired Loans with Allowance: Unpaid Principal Balance   49  
Impaired Loans with Allowance: Related Allowance   1  
Impaired Loans: Total Recorded Investment 327 140 115
Impaired Loans: Total Unpaid Principal Balance 369 178 137
Commercial Portfolio [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment   4 14
Impaired Loans with No Allowance: Unpaid Principal Balance 18 9 49
Impaired Loans with Allowance: Recorded Investment   56 113
Impaired Loans with Allowance: Unpaid Principal Balance   62 128
Impaired Loans with Allowance: Related Allowance   6 51
Impaired Loans: Total Recorded Investment   60 127
Impaired Loans: Total Unpaid Principal Balance 18 71 177
Commercial Portfolio [Member] | Commercial Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment 900 726 1,023
Impaired Loans with No Allowance: Unpaid Principal Balance 1,390 1,792 2,020
Impaired Loans with Allowance: Recorded Investment 2,751 2,520 1,947
Impaired Loans with Allowance: Unpaid Principal Balance 2,915 2,646 1,981
Impaired Loans with Allowance: Related Allowance 893 711 429
Impaired Loans: Total Recorded Investment 4,224 4,088 3,901
Impaired Loans: Total Unpaid Principal Balance 4,878 5,280 4,001
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment 573 842 931
Impaired Loans with No Allowance: Unpaid Principal Balance 573 842 931
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment 331 618  
Impaired Loans with No Allowance: Unpaid Principal Balance 334 618  
Impaired Loans with Allowance: Recorded Investment 240 242  
Impaired Loans with Allowance: Unpaid Principal Balance 242 242  
Impaired Loans with Allowance: Related Allowance 70 72  
Impaired Loans: Total Recorded Investment 571 860  
Impaired Loans: Total Unpaid Principal Balance 576 860  
Residential Portfolio [Member] | Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment 902 848 1,329
Impaired Loans with No Allowance: Unpaid Principal Balance 931 882 1,434
Impaired Loans with Allowance: Recorded Investment 66 68 32
Impaired Loans with Allowance: Unpaid Principal Balance 68 68 32
Impaired Loans with Allowance: Related Allowance 66 68 23
Impaired Loans: Total Recorded Investment 1,292 1,305 1,761
Impaired Loans: Total Unpaid Principal Balance 1,323 1,339 1,466
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Loans with No Allowance: Recorded Investment 324 389 400
Impaired Loans with No Allowance: Unpaid Principal Balance $ 324 $ 389 $ 400