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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2017 USD ($) Contract	Sep. 30, 2016 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	1	1	9
Pre- Modification Outstanding Recorded Investment	$ 86	$ 13	$ 1,537
Post-Modification Outstanding Recorded Investment	$ 86	$ 13	$ 1,537
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
Farm Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Contracts | Contract	1		3
Pre- Modification Outstanding Recorded Investment	$ 86		$ 700
Post-Modification Outstanding Recorded Investment	$ 86		$ 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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+ References

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