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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