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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Receivables [Abstract] |  |  |  |  |  |
Impaired loans without a valuation allowance | $ 1,483 | $ 675 | $ 1,209 | $ 1,483 | $ 1,209 | $ 675
Impaired loans with a valuation allowance | 1,058 | 1,168 | 477 | 1,058 | 477 | 1,168
Total impaired loans | 2,541 | 1,843 | 1,686 | 2,541 | 1,686 | 1,843
Valuation allowance related to impaired loans | 465 | 387 | 252 | 465 | 252 | 387
Total non-accrual loans | 2,294 | 1,705 | 1,634 | 2,294 | 1,634 | 1,705
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0 | 0 | 0 | 0
Average investment in impaired loans | $ 2,924 | $ 1,730 | $ 1,788 | $ 2,609 | $ 1,989 | $ 1,929

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