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Loans and Allowance for Loan and Lease Losses (Loan Portfolio Summarized By The Past Due Status) (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | $ 9,536 | $ 3,524 |  | $ 5,732 |
Financing Receivable, Recorded Investment, Current | 852,771 | 810,400 |  | 730,781 |
Total Loans | 862,307 | 813,924 | $ 769,153 | 736,513 | $ 571,533
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 57 | 59 |  | 55 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Loans | 897 | 1,231 | 1,321 | 1,331 |
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 1,457 | 1,220 |  | 1,197 |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 4,246 | 553 |  | 1,935 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 3,833 | 1,751 |  | 2,600 |
Home Equity [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 311 | 171 |  | 73 |
Financing Receivable, Recorded Investment, Current | 38,360 | 37,437 |  | 33,338 |
Total Loans | 38,671 | 37,608 | 34,579 | 33,411 | 28,506
Home Equity [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 13 | 33 |  |  |
Home Equity [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  | 13 |  | 50 |
Home Equity [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 298 | 125 |  | 23 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 4,184 | 180 |  | 325 |
Financing Receivable, Recorded Investment, Current | 177,184 | 172,338 |  | 159,936 |
Total Loans | 181,368 | 172,518 | 160,278 | 160,261 | 119,010
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 101 | 164 |  | 55 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 4,083 | 12 |  | 204 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  | 4 |  | 66 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Loans | 482,141 | 446,524 | 410,786 | 369,464 | 297,357
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 2,795 | 1,479 |  | 2,275 |
Financing Receivable, Recorded Investment, Current | 478,773 | 444,203 |  | 366,258 |
Total Loans | 481,568 | 445,682 |  | 368,533 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 573 | 59 |  | 788 |
Financing Receivable, Recorded Investment, Current |  | 783 |  | 143 |
Total Loans | 573 | 842 | 951 | 931 |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 57 | 59 |  | 55 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 250 | 475 |  | 211 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 516 |  |  | 215 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 43 |  |  | 608 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  |  |  | 518 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 2,502 | 1,004 |  | 1,456 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 57 | 59 |  | 55 |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 942 | 488 |  |  |
Financing Receivable, Recorded Investment, Current | 52,363 | 53,888 |  | 68,068 |
Total Loans | 53,305 | 54,376 | 56,074 | 68,068 | 56,076
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 371 |  |  |  |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 120 | 404 |  |  |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 451 | 84 |  |  |
Finance Leases Portfolio [Member] | Lease Financing [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Financing Receivable, Recorded Investment, Current | 307 | 425 |  | 727 |
Total Loans | 307 | 425 | 565 | 727 | 1,121
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Loans | 102,637 | 99,457 | 103,822 | 100,665 | 66,442
Residential Portfolio [Member] | Residential Mortgage [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 473 | 909 |  | 2,022 |
Financing Receivable, Recorded Investment, Current | 101,840 | 98,159 |  | 98,243 |
Total Loans | 102,313 | 99,068 |  | 100,265 |
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 258 | 238 |  | 234 |
Financing Receivable, Recorded Investment, Current | 66 | 151 |  | 166 |
Total Loans | 324 | 389 | 370 | 400 |
Residential Portfolio [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 174 | 548 |  | 694 |
Residential Portfolio [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 32 |  |  | 12 |
Residential Portfolio [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Mortgage [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  | 124 |  | 550 |
Residential Portfolio [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member] | Excluded Acquired with Credit Deterioration [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 299 | 237 |  | 778 |
Residential Portfolio [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 226 | 238 |  | 222 |
Consumer Portfolio [Member] | Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  |  |  | 15 |
Financing Receivable, Recorded Investment, Current | 3,878 | 3,016 |  | 3,902 |
Total Loans | $ 3,878 | $ 3,016 | $ 3,049 | 3,917 | $ 3,021
Consumer Portfolio [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  |  |  | 10 |
Consumer Portfolio [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member] |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due |  |  |  | $ 5 |

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