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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2019
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,393	$ 2,420	$ 1,915	$ 2,420
Impaired loans with a valuation allowance	4,795	641	254	641
Total impaired loans	6,188	3,061	2,169	3,061
Valuation allowance related to impaired loans	766	197	59	197
Total non-accrual loans	3,344	3,400	1,188	3,400
Total loans past-due ninety days or more and still accruing	0	0	0	0
Average investment in impaired loans	$ 4,314	$ 3,120	$ 2,135	$ 2,649

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