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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 804 | $ 1,131 | $ 1,024 | $ 804 | $ 1,024 | $ 1,131
Impaired loans with a valuation allowance | 648 | 614 | 691 | 648 | 691 | 614
Total impaired loans | 1,452 | 1,745 | 1,715 | 1,452 | 1,715 | 1,745
Valuation allowance related to impaired loans | 132 | 106 | 115 | 132 | 115 | 106
Total non-accrual loans | 903 | 1,003 | 1,365 | 903 | 1,365 | 1,003
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 1,452 | $ 2,160 | $ 1,744 | $ 1,570 | $ 1,789 | $ 1,885

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