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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014 Agricultural Real Estate [Member] Contract	Jun. 30, 2013 Commercial and Industrial [Member] Contract	Jun. 30, 2013 Commercial and Industrial [Member] Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts Modified, Troubled Debt Restructurings	2	3	4
Pre- Modification Outstanding Recorded Investment	$ 153	$ 2,251	$ 2,294
Post- Modification Outstanding Recorded Investment	$ 141	$ 2,251	$ 2,332

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- Definition

Financing Receivable Modifications Post Modification Recorded Investment One

+ References

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- Definition

Financing Receivable Modifications Pre Modification Recorded Investment One

+ References

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- 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=28368275&loc=SL6953676-111524

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