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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	$ 7,638	$ 8,665	$ 8,223	$ 9,849
Impaired loans, Interest Income Recognized, Total	191	65	438	312
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	2,401	1,058	1,453	1,680
Impaired loans, Interest Income Recognized, Total	67	4	147	41
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	1,774	2,447	1,954	2,887
Impaired loans, Interest Income Recognized, Total	51	23	101	120
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	556	1,870	1,519	1,997
Impaired loans, Interest Income Recognized, Total	36	12	62	31
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	1,873	2,450	1,699	2,640
Impaired loans, Interest Income Recognized, Total	29	12	89	78
Real Estate Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total		20	473	20
Impaired loans, Interest Income Recognized, Total	6		6
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	1,032	816	1,123	620
Impaired loans, Interest Income Recognized, Total	2	14	33	42
Consumer and Other [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans, Average Recorded Investment, Total	$ 2	$ 4	$ 2	$ 5

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+ References

No definition available.

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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
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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