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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 2,420	$ 1,808
Impaired loans with a valuation allowance	641	246
Total impaired loans	3,061	2,054
Valuation allowance related to impaired loans	197	31
Total non-accrual loans	3,400	542
Total loans past-due ninety days or more and still accruing	0	0
Average investment in impaired loans	2,649	1,958	$ 1,885
Interest income recognized on impaired loans	118	69	57
Interest income recognized on a cash basis on impaired loans	$ 9	$ 17	$ 23

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