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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 1,024 | $ 1,141 | $ 997 | $ 1,024 | $ 997 | $ 1,141
Impaired loans with a valuation allowance | 691 | 711 | 622 | 691 | 622 | 711
Total impaired loans | 1,715 | 1,852 | 1,619 | 1,715 | 1,619 | 1,852
Valuation allowance related to impaired loans | 115 | 135 | 217 | 115 | 217 | 135
Total non-accrual loans | 1,365 | 1,384 | 1,528 | 1,365 | 1,528 | 1,384
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 1,744 | $ 1,684 | $ 1,899 | $ 1,789 | $ 1,995 | $ 1,802

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