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Allowance for Loan Losses, by class of loan (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | $ 15,649,594 | $ 28,280,077 | $ 31,400,641
Charge-Offs | (10,454,175) | (22,850,673) | (17,622,454)
Recoveries | 756,735 | 1,970,190 | 1,151,890
Provision | 6,784,767 | 8,250,000 | 13,350,000
Ending Balance | 12,736,921 | 15,649,594 | 28,280,077
Reduction in Allowance for Loans and Lease Losses estimate | 2,154,639 |  |
Loan balance for reviewing, minimum | 50,000 |  |
Impaired loans below the $50,000 review threshold | 1,026,624 | 995,168 | 976,971
Substandard [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Specific allocation associated with Substandard loans | 898,773 | 1,926,438 |
Substandard loans, not classified as impaired | 10,795,911 | 16,746,384 |
Commercial [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 1,070,560 | 4,414,817 | 3,930,760
Charge-Offs | (653,389) | (841,887) | (469,214)
Recoveries | 139,802 | 127,490 | 80,181
Provision | 424,048 | (2,629,860) | 873,090
Ending Balance | 981,021 | 1,070,560 | 4,414,817
Agricultural [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 297,168 | 698,637 | 779,337
Charge-Offs | (3,028) | (455,165) | (255,627)
Recoveries | 0 | 454,453 | 1,377
Provision | 2,035 | (400,757) | 173,550
Ending Balance | 296,175 | 297,168 | 698,637
Commercial Construction [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 3,122,594 | 4,126,043 | 7,402,484
Charge-Offs | (4,106,124) | (6,957,181) | (4,648,124)
Recoveries | 209,352 | 557,168 | 184,868
Provision | 2,664,378 | 5,396,564 | 1,186,815
Ending Balance | 1,890,200 | 3,122,594 | 4,126,043
Residential Construction [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 138,092 | 519,766 | 447,676
Charge-Offs | 0 | (481) | 0
Recoveries | 0 | 0 | 0
Provision | 0 | (381,193) | 72,090
Ending Balance | 138,092 | 138,092 | 519,766
Commercial Real Estate [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 6,448,064 | 8,029,525 | 8,790,443
Charge-Offs | (4,325,642) | (12,492,097) | (7,459,619)
Recoveries | 232,880 | 527,996 | 141,931
Provision | 2,807,537 | 10,382,640 | 6,556,770
Ending Balance | 5,162,839 | 6,448,064 | 8,029,525
Residential [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 3,695,357 | 5,941,696 | 5,025,839
Charge-Offs | (960,620) | (1,704,887) | (2,929,668)
Recoveries | 47,690 | 149,173 | 439,940
Provision | 623,520 | (690,625) | 3,405,585
Ending Balance | 3,405,947 | 3,695,357 | 5,941,696
Farmland [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 364,663 | 944,323 | 942,019
Charge-Offs | (224,725) | (60,447) | (271,750)
Recoveries | 4,716 | 411 | 7,639
Provision | 145,872 | (519,624) | 266,415
Ending Balance | 290,526 | 364,663 | 944,323
Consumer [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 205,154 | 3,074,220 | 2,826,058
Charge-Offs | (169,249) | (222,878) | (548,834)
Recoveries | 81,956 | 145,279 | 245,641
Provision | 109,913 | (2,791,467) | 551,355
Ending Balance | 227,774 | 205,154 | 3,074,220
Other [Member] |  |  |
Activity in allowance for loan losses, segregated by class of loan [Roll Forward] |  |  |
Beginning Balance | 307,942 | 531,050 | 1,256,025
Charge-Offs | (11,398) | (115,650) | (1,039,618)
Recoveries | 40,339 | 8,220 | 50,313
Provision | 7,464 | (115,678) | 264,330
Ending Balance | $ 344,347 | $ 307,942 | $ 531,050

X
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- Definition Minimum loan balance for reviewing. + References No definition available. + Details
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- Definition A category of financing receivables that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the creditor will sustain some loss if the deficiencies are not corrected. + References No definition available. + Details
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- Definition A category of financing receivables that are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the creditor will sustain some loss if the deficiencies are not corrected. + References No definition available. + Details
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- Definition Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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