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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2016
Receivables [Abstract] |  |  |  |
Impaired loans without a valuation allowance | $ 1,099 | $ 1,141 | $ 1,042 | $ 1,141
Impaired loans with a valuation allowance | 694 | 711 | 1,169 | 711
Total impaired loans | 1,793 | 1,852 | 2,211 | 1,852
Valuation allowance related to impaired loans | 117 | 135 | 426 | 135
Total non-accrual loans | 1,430 | 1,384 | 2,003 | 1,384
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 1,832 | $ 1,684 | $ 2,130 | $ 1,802

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