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Loans - Schedule of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Receivables [Abstract] |  |  |
Impaired loans without a valuation allowance | $ 1,209 | $ 253 | $ 924
Impaired loans with a valuation allowance | 477 | 1,308 | 1,516
Total impaired loans | 1,686 | 1,561 | 2,440
Valuation allowance related to impaired loans | 252 | 423 | 516
Total non-accrual loans | 1,634 | 2,908 | 3,329
Total loans past-due ninety days or more and still accruing | 0 | 0 | 0
Quarter ended average investment in impaired loans | 1,788 | 1,879 | 2,532
Year to date average investment in impaired loans | $ 1,989 | $ 3,521 | $ 3,274

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