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Loans (Details 5) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Risk category of loans by portfolio segment |  |
Loans - Gross | $ 485,025 | $ 501,535
Agricultural Real Estate [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 35,898 | 40,143
Agricultural Real Estate [Member] | 1-2 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 2,255 | 2,719
Agricultural Real Estate [Member] | 3 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 13,837 | 15,111
Agricultural Real Estate [Member] | 4 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 18,979 | 21,481
Agricultural Real Estate [Member] | 5 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 790 | 794
Agricultural Real Estate [Member] | 6 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 37 | 38
Agricultural Real Estate [Member] | 8 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  |
Agricultural [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 51,896 | 57,770
Agricultural [Member] | 1-2 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 2,883 | 5,022
Agricultural [Member] | 3 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 16,509 | 23,525
Agricultural [Member] | 4 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 32,469 | 29,188
Agricultural [Member] | 5 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 35 | 35
Agricultural [Member] | 8 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  |
Commercial Real Estate [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 209,601 | 199,999
Commercial Real Estate [Member] | 1-2 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 3,264 | 4,046
Commercial Real Estate [Member] | 3 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 52,354 | 42,467
Commercial Real Estate [Member] | 4 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 139,030 | 137,537
Commercial Real Estate [Member] | 5 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 8,672 | 8,984
Commercial Real Estate [Member] | 6 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 6,237 | 6,295
Commercial Real Estate [Member] | 7 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 44 | 670
Commercial Real Estate [Member] | 8 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  |
Commercial and Industrial [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 89,779 | 101,624
Commercial and Industrial [Member] | 1-2 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 57 | 750
Commercial and Industrial [Member] | 3 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 22,021 | 21,750
Commercial and Industrial [Member] | 4 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 60,990 | 71,228
Commercial and Industrial [Member] | 5 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 2,404 | 3,385
Commercial and Industrial [Member] | 6 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 1,600 | 2,202
Commercial and Industrial [Member] | 7 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 2,707 | 2,309
Commercial and Industrial [Member] | 8 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  |
Industrial Development Bonds [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 1,202 | 1,299
Industrial Development Bonds [Member] | 1-2 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  | 97
Industrial Development Bonds [Member] | 3 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 858 | 859
Industrial Development Bonds [Member] | 4 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross | 344 | 343
Industrial Development Bonds [Member] | 8 [Member] |  |
Risk category of loans by portfolio segment |  |
Loans - Gross |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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