Allowance for Loan Losses, by class of loan (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance $ 11,805,986 $ 12,736,921 $ 15,649,594
Charge-Offs (5,104,491) (6,227,716) (10,454,175)
Recoveries 792,821 811,781 756,735
Provision 1,308,000 4,485,000 6,784,767
Ending Balance 8,802,316 11,805,986 12,736,921
Loan balance for reviewing high risk loans minimum 250,000 250,000 50,000
Financing receivable transfer from individual impairment review to collective impairment review   4,100,000  
Impaired loans below the $250,000 review threshold 3,885,411 2,821,199  
Amount of impaired loans below old individual impairment review level of $50,000     1,026,624
Substandard [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Substandard loans, not classified as impaired 9,356,253 6,664,935  
Specific allocation associated with Substandard loans 747,982 260,742  
Commercial [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 1,017,073 981,021 1,070,560
Charge-Offs (624,944) (120,690) (653,389)
Recoveries 76,002 55,829 139,802
Provision 29,430 100,913 424,048
Ending Balance 497,561 1,017,073 981,021
Agricultural [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 293,886 296,175 297,168
Charge-Offs 0 (34,502) (3,028)
Recoveries 2,700 6,200 0
Provision 7,586 26,013 2,035
Ending Balance 304,172 293,886 296,175
Commercial Construction [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 1,782,179 1,890,200 3,122,594
Charge-Offs (1,543,099) (2,071,162) (4,106,124)
Recoveries 485,005 253,459 209,352
Provision 498,610 1,709,682 2,664,378
Ending Balance 1,222,695 1,782,179 1,890,200
Residential Construction [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 138,092 138,092 138,092
Charge-Offs 0 0 0
Recoveries 0 0 0
Provision 0 0 0
Ending Balance 138,092 138,092 138,092
Commercial Real Estate [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 4,379,276 5,162,839 6,448,064
Charge-Offs (1,326,825) (2,872,408) (4,325,642)
Recoveries 90,042 297,984 232,880
Provision 522,284 1,790,861 2,807,537
Ending Balance 3,664,777 4,379,276 5,162,839
Residential [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 3,278,269 3,405,947 3,695,357
Charge-Offs (1,033,966) (706,242) (960,620)
Recoveries 31,127 64,583 47,690
Provision 149,897 513,981 623,520
Ending Balance 2,425,327 3,278,269 3,405,947
Farmland [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 311,494 290,526 364,663
Charge-Offs (233,580) (20,977) (224,725)
Recoveries 20,000 21,762 4,716
Provision 5,886 20,183 145,872
Ending Balance 103,800 311,494 290,526
Consumer [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 243,253 227,774 205,154
Charge-Offs (342,077) (397,822) (169,249)
Recoveries 72,477 93,520 81,956
Provision 93,261 319,781 109,913
Ending Balance 66,914 243,253 227,774
Other [Member]      
Activity in allowance for loan losses, segregated by class of loan [Roll Forward]      
Beginning Balance 362,464 344,347 307,942
Charge-Offs 0 (3,913) (11,398)
Recoveries 15,468 18,444 40,339
Provision 1,046 3,586 7,464
Ending Balance $ 378,978 $ 362,464 $ 344,347