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Loans - Schedule of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Receivables [Abstract]
Impaired loans without a valuation allowance	$ 1,024	$ 1,141	$ 997	$ 1,024	$ 997	$ 1,141
Impaired loans with a valuation allowance	691	711	622	691	622	711
Total impaired loans	1,715	1,852	1,619	1,715	1,619	1,852
Valuation allowance related to impaired loans	115	135	217	115	217	135
Total non-accrual loans	1,365	1,384	1,528	1,365	1,528	1,384
Total loans past-due ninety days or more and still accruing	0	0	0	0	0	0
Average investment in impaired loans	$ 1,744	$ 1,684	$ 1,899	$ 1,789	$ 1,995	$ 1,802

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Publisher FASB
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+ References

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-Publisher FASB
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-Topic 310
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

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Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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

+ References

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-Publisher FASB
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-Topic 310
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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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