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Loans - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Receivables [Abstract]            
Impaired loans without a valuation allowance $ 2,695 $ 2,420 $ 1,071 $ 2,695 $ 1,071 $ 2,420
Impaired loans with a valuation allowance 9,872 641 1,105 9,872 1,105 641
Total impaired loans 12,567 3,061 2,176 12,567 2,176 3,061
Valuation allowance related to impaired loans 1,170 197 235 1,170 235 197
Total non-accrual loans 8,473 3,400 1,328 8,473 1,328 3,400
Total loans past-due ninety days or more and still accruing 0 0 0 0 0 0
Average investment in impaired loans $ 8,352 $ 3,120 $ 2,201 $ 6,333 $ 2,168 $ 2,649