Troubled Debt Restructures - Breakdown of Types of Concessions Made by Loan Class (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) Contract	Dec. 31, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	10	4	10
Pre-Modification Outstanding Recorded Investment	$ 907	$ 482	$ 684
Post-Modification Outstanding Recorded Investment	$ 863	$ 328	$ 673
Other Payment Terms [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	10	4	10
Pre-Modification Outstanding Recorded Investment	$ 907	$ 482	$ 684
Post-Modification Outstanding Recorded Investment	$ 863	$ 328	$ 673
Other Payment Terms [Member] \| Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	1		2
Pre-Modification Outstanding Recorded Investment	$ 12		$ 46
Post-Modification Outstanding Recorded Investment	$ 10		$ 44
Other Payment Terms [Member] \| Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	1
Pre-Modification Outstanding Recorded Investment	$ 9
Post-Modification Outstanding Recorded Investment	$ 5
Other Payment Terms [Member] \| Real Estate - Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	2
Pre-Modification Outstanding Recorded Investment	$ 178
Post-Modification Outstanding Recorded Investment	$ 173
Other Payment Terms [Member] \| Other Real Estate Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract			1
Pre-Modification Outstanding Recorded Investment			$ 55
Post-Modification Outstanding Recorded Investment			$ 55
Other Payment Terms [Member] \| Real Estate - Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract	6	4	6
Pre-Modification Outstanding Recorded Investment	$ 708	$ 482	$ 530
Post-Modification Outstanding Recorded Investment	$ 675	$ 328	$ 521
Other Payment Terms [Member] \| Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| Contract			1
Pre-Modification Outstanding Recorded Investment			$ 53
Post-Modification Outstanding Recorded Investment			$ 53

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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