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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 9 Months Ended
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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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- 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=49124121&loc=SL6953676-111524 + Details
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