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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 804 $ 1,131 $ 1,024 $ 804 $ 1,024 $ 1,131
Impaired loans with a valuation allowance 648 614 691 648 691 614
Total impaired loans 1,452 1,745 1,715 1,452 1,715 1,745
Valuation allowance related to impaired loans 132 106 115 132 115 106
Total non-accrual loans 903 1,003 1,365 903 1,365 1,003
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 1,452 $ 2,160 $ 1,744 $ 1,570 $ 1,789 $ 1,885