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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 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | $ 1,136 | $ 729 |
60-89 Days Past Due | 256 | 7 |
Greater Than 90 Days | 3,994 | 4,092 |
Total Past Due | 5,386 | 4,828 |
Current | 495,688 | 496,574 |
Total Financing Receivables | 501,074 | 501,402 |
Recorded Investment > 90 Days and Accruing |  | 1 |
Other real estate owned residential mortgages [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 453 | 575 |
60-89 Days Past Due | 249 |  |
Greater Than 90 Days | 319 | 648 |
Total Past Due | 1,021 | 1,223 |
Current | 76,927 | 79,064 |
Total Financing Receivables | 77,948 | 80,287 |
Recorded Investment > 90 Days and Accruing |  |  |
Agricultural Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 104 |  |
60-89 Days Past Due |  |  |
Greater Than 90 Days | 88 |  |
Total Past Due | 192 |  |
Current | 35,554 | 40,143 |
Total Financing Receivables | 35,746 | 40,143 |
Recorded Investment > 90 Days and Accruing |  |  |
Agricultural [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due |  | 11 |
60-89 Days Past Due |  |  |
Greater Than 90 Days |  |  |
Total Past Due |  | 11 |
Current | 55,331 | 57,759 |
Total Financing Receivables | 55,331 | 57,770 |
Recorded Investment > 90 Days and Accruing |  |  |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 501 |  |
60-89 Days Past Due |  |  |
Greater Than 90 Days | 1,035 | 877 |
Total Past Due | 1,536 | 877 |
Current | 213,710 | 199,122 |
Total Financing Receivables | 215,246 | 199,999 |
Recorded Investment > 90 Days and Accruing |  |  |
Commercial and Industrial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 65 | 78 |
60-89 Days Past Due |  |  |
Greater Than 90 Days | 2,552 | 2,567 |
Total Past Due | 2,617 | 2,645 |
Current | 94,463 | 100,278 |
Total Financing Receivables | 97,080 | 102,923 |
Recorded Investment > 90 Days and Accruing |  |  |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
30-59 Days Past Due | 13 | 65 |
60-89 Days Past Due | 7 | 7 |
Greater Than 90 Days |  |  |
Total Past Due | 20 | 72 |
Current | 19,703 | 20,208 |
Total Financing Receivables | 19,723 | 20,280 |
Recorded Investment > 90 Days and Accruing |  | $ 1 |

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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 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=28368275&loc=SL6953401-111524 + Details
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