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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,808	$ 1,131
Impaired loans with a valuation allowance	246	614
Total impaired loans	2,054	1,745
Valuation allowance related to impaired loans	31	106
Total non-accrual loans	542	1,003
Total loans past-due ninety days or more and still accruing	0	0
Average investment in impaired loans	1,958	1,885	$ 1,802
Interest income recognized on impaired loans	69	57	64
Interest income recognized on a cash basis on impaired loans	$ 17	$ 23	$ 27

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- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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