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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified in the Last 3 Months | Contract	1
Pre-Modification Outstanding Recorded Investment	$ 25
Post-Modification Outstanding Recorded Investment	$ 21
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified in the Last 3 Months | Contract	1
Pre-Modification Outstanding Recorded Investment	$ 528
Post-Modification Outstanding Recorded Investment	$ 430
Agricultural Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified in the Last 3 Months | Contract		2
Pre-Modification Outstanding Recorded Investment		$ 153
Post-Modification Outstanding Recorded Investment		$ 141

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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=49124121&loc=SL6953676-111524

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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



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+ 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=49124121&loc=SL6953676-111524

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