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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,841	$ 1,131	$ 1,294	$ 1,841	$ 1,294	$ 1,131
Impaired loans with a valuation allowance	970	614	685	970	685	614
Total impaired loans	2,811	1,745	1,979	2,811	1,979	1,745
Valuation allowance related to impaired loans	148	106	123	148	123	106
Total non-accrual loans	483	1,003	1,729	483	1,729	1,003
Total loans past-due ninety days or more and still accruing	0	0	0	0	0	0
Average investment in impaired loans	$ 2,158	$ 2,160	$ 1,804	$ 1,765	$ 1,793	$ 1,885

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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- Definition

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

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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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