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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 997 $ 1,257 $ 3,239 $ 997 $ 3,239 $ 1,257
Impaired loans with a valuation allowance 622 879 1,783 622 1,783 879
Total impaired loans 1,619 2,136 5,022 1,619 5,022 2,136
Valuation allowance related to impaired loans 217 330 475 217 475 330
Total non-accrual loans 1,528 2,041 3,063 1,528 3,063 2,041
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 1,899 $ 2,207 $ 3,435 $ 1,995 $ 2,451 $ 2,509