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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Contract	Dec. 31, 2016 USD ($) Contract	Dec. 31, 2015 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	1	9	1
Pre- Modification Outstanding Recorded Investment	$ 13	$ 1,537	$ 41
Post-Modification Outstanding Recorded Investment	$ 13	$ 1,537	$ 41
Commercial and Agriculture [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract		4
Pre- Modification Outstanding Recorded Investment		$ 529
Post-Modification Outstanding Recorded Investment		$ 529
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	1	2
Pre- Modification Outstanding Recorded Investment	$ 13	$ 308
Post-Modification Outstanding Recorded Investment	$ 13	$ 308
Real Estate Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract			1
Pre- Modification Outstanding Recorded Investment			$ 41
Post-Modification Outstanding Recorded Investment			$ 41
Farm Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract		3
Pre- Modification Outstanding Recorded Investment		$ 700
Post-Modification Outstanding Recorded Investment		$ 700

X

- Definition

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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- Definition

Post-modification amount of investment in financing receivables 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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- Definition

Pre-modification amount of investment in financing receivables 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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