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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 Contract | Mar. 31, 2013 Contract
Agricultural Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings | 2 |
Pre- Modification Outstanding Recorded Investment | $ 153 |
Post- Modification Outstanding Recorded Investment | 141 |
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted |  |
Recorded Investment |  |
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings |  | 1
Pre- Modification Outstanding Recorded Investment |  | 81
Post- Modification Outstanding Recorded Investment |  | 43
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted |  |
Recorded Investment |  |
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts Modified, Troubled Debt Restructurings That Subsequently Defaulted |  |
Recorded Investment |  |

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- Definition Financing Receivable Modifications Pre Modification Recorded Investment One + References No definition available. + Details
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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 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953682-111524 + Details
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