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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 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | $ 717 | $ 806 |
60-89 Days Past Due | 877 | 2 |
Greater Than 90 Days | 494 | 633 |
Total Past Due | 2,088 | 1,441 |
Current | 606,516 | 574,672 |
Total Financing Receivables | 608,604 | 576,113 | 523,326
Recorded Investment > 90 Days and Accruing | 0 | 0 | 0
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 576 | 778 |
60-89 Days Past Due | 150 | 0 |
Greater Than 90 Days | 489 | 234 |
Total Past Due | 1,215 | 1,012 |
Current | 96,436 | 91,426 |
Total Financing Receivables | 97,651 | 92,438 | 79,268
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 25 | 0 |
60-89 Days Past Due | 0 | 0 |
Greater Than 90 Days | 0 | 0 |
Total Past Due | 25 | 0 |
Current | 48,787 | 44,301 |
Total Financing Receivables | 48,812 | 44,301 | 37,758
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 0 | 0 |
60-89 Days Past Due | 0 | 0 |
Greater Than 90 Days | 0 | 0 |
Total Past Due | 0 | 0 |
Current | 67,221 | 65,449 |
Total Financing Receivables | 67,221 | 65,449 | 56,752
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 56 | 0 |
60-89 Days Past Due | 709 | 0 |
Greater Than 90 Days | 0 | 373 |
Total Past Due | 765 | 373 |
Current | 273,309 | 248,520 |
Total Financing Receivables | 274,074 | 248,893 | 232,104
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 0 | 0 |
60-89 Days Past Due | 0 | 0 |
Greater Than 90 Days | 0 | 26 |
Total Past Due | 0 | 26 |
Current | 97,780 | 103,830 |
Total Financing Receivables | 97,780 | 103,856 | 96,643
Recorded Investment > 90 Days and Accruing | 0 | 0 |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 60 | 28 |
60-89 Days Past Due | 18 | 2 |
Greater Than 90 Days | 5 | 0 |
Total Past Due | 83 | 30 |
Current | 22,983 | 21,146 |
Total Financing Receivables | 23,066 | 21,176 | 20,801
Recorded Investment > 90 Days and Accruing | $ 0 | $ 0 |

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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=35738203&loc=SL6953401-111524 + Details
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- Definition Financing receivables that are less than 90 days past due but more than 59 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=35738203&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=35738203&loc=SL6953401-111524 + Details
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