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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,914	$ 1,808	$ 1,841	$ 1,914	$ 1,841	$ 1,808
Impaired loans with a valuation allowance	1,314	246	970	1,314	970	246
Total impaired loans	3,228	2,054	2,811	3,228	2,811	2,054
Valuation allowance related to impaired loans	187	31	148	187	148	31
Total non-accrual loans	3,275	542	483	3,275	483	542
Total loans past-due ninety days or more and still accruing	0	0	0	0	0	0
Average investment in impaired loans	$ 3,141	$ 2,533	$ 2,158	$ 2,492	$ 1,765	$ 1,958

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Amount of financing receivable 90 days or more past due and still accruing.

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