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Loans - Contractual Aging of Recorded Investment in Past Due Loans by Portfolio Segment of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | $ 1,980 | $ 806 |
60-89 Days Past Due | 140 | 2 |
Greater Than 90 Days | 148 | 633 |
Total Past Due | 2,268 | 1,441 |
Current | 580,604 | 574,672 |
Total Financing Receivables | 582,872 | 576,113 |
Recorded Investment > 90 Days and Accruing |  |  | 3
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due |  | 778 |
60-89 Days Past Due |  |  |
Greater Than 90 Days |  | 234 |
Total Past Due |  | 1,012 |
Current |  | 91,426 |
Total Financing Receivables |  | 92,438 |
Recorded Investment > 90 Days and Accruing |  |  |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due |  |  |
60-89 Days Past Due |  |  |
Greater Than 90 Days |  |  |
Total Past Due |  |  |
Current | 49,629 | 44,301 |
Total Financing Receivables | 49,629 | 44,301 |
Recorded Investment > 90 Days and Accruing |  |  |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due |  |  |
60-89 Days Past Due | 5 |  |
Greater Than 90 Days |  |  |
Total Past Due | 5 |  |
Current | 64,854 | 65,449 |
Total Financing Receivables | 64,859 | 65,449 |
Recorded Investment > 90 Days and Accruing |  |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 1,102 |  |
60-89 Days Past Due | 94 |  |
Greater Than 90 Days | 32 | 373 |
Total Past Due | 1,228 | 373 |
Current | 260,406 | 248,520 |
Total Financing Receivables | 261,634 | 248,893 |
Recorded Investment > 90 Days and Accruing |  |  |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 62 |  |
60-89 Days Past Due | 41 |  |
Greater Than 90 Days |  | 26 |
Total Past Due | 103 | 26 |
Current | 94,255 | 103,830 |
Total Financing Receivables | 94,358 | 103,856 |
Recorded Investment > 90 Days and Accruing |  |  |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 32 | 28 |
60-89 Days Past Due |  | 2 |
Greater Than 90 Days |  |  |
Total Past Due | 32 | 30 |
Current | 20,992 | 21,146 |
Total Financing Receivables | 21,024 | 21,176 |
Recorded Investment > 90 Days and Accruing |  |  |

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- Definition Financing receivables that are less than 60 days past due but more than 29 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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