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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 515 | $ 1,257 | $ 1,483 | $ 515 | $ 1,483 | $ 1,257
Impaired loans with a valuation allowance | 891 | 879 | 1,058 | 891 | 1,058 | 879
Total impaired loans | 1,406 | 2,136 | 2,541 | 1,406 | 2,541 | 2,136
Valuation allowance related to impaired loans | 125 | 330 | 465 | 125 | 465 | 330
Total non-accrual loans | 1,132 | 2,041 | 2,294 | 1,132 | 2,294 | 2,041
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 1,499 | $ 2,207 | $ 2,924 | $ 1,843 | $ 2,609 | $ 2,509

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