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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2018
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,915	$ 1,808	$ 999	$ 1,808
Impaired loans with a valuation allowance	254	246	607	246
Total impaired loans	2,169	2,054	1,606	2,054
Valuation allowance related to impaired loans	59	31	104	31
Total non-accrual loans	1,188	542	900	542
Total loans past-due ninety days or more and still accruing	0	0	0	0
Average investment in impaired loans	$ 2,135	$ 2,533	$ 1,688	$ 1,958

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
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- Definition

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

+ References

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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Amount of allowance for credit losses related to recorded investment.

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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

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