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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2015
Receivables [Abstract]        
Impaired loans without a valuation allowance $ 1,042 $ 1,257 $ 624 $ 1,257
Impaired loans with a valuation allowance 1,169 879 1,619 879
Total impaired loans 2,211 2,136 2,243 2,136
Valuation allowance related to impaired loans 426 330 428 330
Total non-accrual loans 2,003 2,041 2,424 2,041
Total loans past-due ninety days or more and still accruing 0 0 0 0
Average investment in impaired loans $ 2,130 $ 2,207 $ 1,958 $ 2,509