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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,071	$ 1,808	$ 804	$ 1,071	$ 804	$ 1,808
Impaired loans with a valuation allowance	1,105	246	648	1,105	648	246
Total impaired loans	2,176	2,054	1,452	2,176	1,452	2,054
Valuation allowance related to impaired loans	235	31	132	235	132	31
Total non-accrual loans	1,328	542	903	1,328	903	542
Total loans past-due ninety days or more and still accruing	0	0	0	0	0	0
Average investment in impaired loans	$ 2,201	$ 2,533	$ 1,452	$ 2,168	$ 1,570	$ 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 investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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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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