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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 5,134	$ 2,420	$ 1,914	$ 5,134	$ 1,914	$ 2,420
Impaired loans with a valuation allowance	10,125	641	1,314	10,125	1,314	641
Total impaired loans	15,259	3,061	3,228	15,259	3,228	3,061
Valuation allowance related to impaired loans	1,198	197	187	1,198	187	197
Total non-accrual loans	7,870	3,400	3,275	7,870	3,275	3,400
Total loans past-due ninety days or more and still accruing	408	0	0	408	0	0
Average investment in impaired loans	$ 13,517	$ 3,120	$ 3,141	$ 8,613	$ 2,492	$ 2,649

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