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Loans and Allowance - Total Allowance by Loan Segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for credit losses | $ 410 | $ 985 | $ 150 | $ 150 | $ 746 | $ 125 | $ 112 | $ 38 | $ 260 |  |  |  | $ 1,695,000 | $ 1,020,876 | $ 260,000
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 1,103,686 |  |  |  |  |  |  |  |  |  |  |  | 1,103,686 |  |
Loans Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 3,117,870 |  |  |  | 2,972,019 |  |  |  | $ 3,307,920 | 3,117,870 | 2,972,019 | 3,307,920
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,695,000 | 1,020,876 | 260,000
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 512,117 | 471,330 | 437,502
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  | (2,174,736) | (1,346,355) | (1,033,403)
Balance, end of year | 3,150,251 |  |  |  | 3,117,870 |  |  |  | 2,972,019 |  |  |  | 3,150,251 | 3,117,870 | 2,972,019
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 1,103,686 |  |  |  | 1,270,159 |  |  |  | 1,163,567 |  |  |  | 1,103,686 | 1,270,159 | 1,163,567
Individually evaluated for impairment, Related loan balance | 5,126,778 |  |  |  | 6,445,676 |  |  |  | 5,908,796 |  |  |  | 5,126,778 | 6,445,676 | 5,908,796
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,046,565 |  |  |  | 1,847,711 |  |  |  | 1,808,452 |  |  |  | 2,046,565 | 1,847,711 | 1,808,452
Collectively evaluated for impairment, Balance in allowance | 258,730,913 |  |  |  | 271,784,827 |  |  |  | 268,918,682 |  |  |  | 258,730,913 | 271,784,827 | 268,918,682
Loans Receivable | Commercial and Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 385,631 |  |  |  | 412,909 |  |  |  | 541,916 | 385,631 | 412,909 | 541,916
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | (78,901) | (4,580) | 46,303
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 | 6,440 | 26,804
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  | (2,807) | (29,138) | (202,114)
Balance, end of year | 305,323 |  |  |  | 385,631 |  |  |  | 412,909 |  |  |  | 305,323 | 385,631 | 412,909
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 240,500 |  |  |  | 252,500 |  |  |  | 278,786 |  |  |  | 240,500 | 252,500 | 278,786
Individually evaluated for impairment, Related loan balance | 240,500 |  |  |  | 252,500 |  |  |  | 278,786 |  |  |  | 240,500 | 252,500 | 278,786
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 64,823 |  |  |  | 133,131 |  |  |  | 134,123 |  |  |  | 64,823 | 133,131 | 134,123
Collectively evaluated for impairment, Balance in allowance | 4,299,201 |  |  |  | 3,266,252 |  |  |  | 3,893,961 |  |  |  | 4,299,201 | 3,266,252 | 3,893,961
Loans Receivable | Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 335,009 |  |  |  | 898,362 |  |  |  | 1,183,240 | 335,009 | 898,362 | 1,183,240
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | (23,814) | (448,027) | (374,067)
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 13,468 | 128,068 | $ 89,189
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  | (63,000) | (243,394) |
Balance, end of year | 261,663 |  |  |  | 335,009 |  |  |  | 898,362 |  |  |  | 261,663 | 335,009 | $ 898,362
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 100,745 |  |  |  | 148,791 |  |  |  | 550,794 |  |  |  | 100,745 | 148,791 | 550,794
Individually evaluated for impairment, Related loan balance | 1,143,317 |  |  |  | 2,155,816 |  |  |  | 3,364,193 |  |  |  | 1,143,317 | 2,155,816 | 3,364,193
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 160,918 |  |  |  | 186,218 |  |  |  | 347,568 |  |  |  | 160,918 | 186,218 | 347,568
Collectively evaluated for impairment, Balance in allowance | 63,128,304 |  |  |  | 63,486,816 |  |  |  | 65,414,415 |  |  |  | 63,128,304 | 63,486,816 | 65,414,415
Loans Receivable | Consumer and Indirect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 1,281,222 |  |  |  | 1,187,604 |  |  |  | 1,057,531 | 1,281,222 | 1,187,604 | 1,057,531
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | 296,437 | 601,522 | 468,559
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 486,776 | 331,108 | 313,795
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  | (1,260,533) | (839,012) | (652,281)
Balance, end of year | 803,902 |  |  |  | 1,281,222 |  |  |  | 1,187,604 |  |  |  | 803,902 | 1,281,222 | 1,187,604
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 65,353 |  |  |  | 186,226 |  |  |  | 178,657 |  |  |  | 65,353 | 186,226 | 178,657
Individually evaluated for impairment, Related loan balance | 950,722 |  |  |  | 1,106,217 |  |  |  | 636,174 |  |  |  | 950,722 | 1,106,217 | 636,174
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 738,549 |  |  |  | 1,094,996 |  |  |  | 1,008,947 |  |  |  | 738,549 | 1,094,996 | 1,008,947
Collectively evaluated for impairment, Balance in allowance | 74,352,049 |  |  |  | 82,996,925 |  |  |  | 72,594,259 |  |  |  | 74,352,049 | 82,996,925 | 72,594,259
Loans Receivable | Residential Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 1,169,627 |  |  |  | 593,463 |  |  |  | 392,506 | 1,169,627 | 593,463 | 392,506
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,299,194 | 805,261 | 372,251
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 10,473 | 5,714 | 7,714
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  | (848,396) | (234,811) | (179,008)
Balance, end of year | 1,630,898 |  |  |  | 1,169,627 |  |  |  | 593,463 |  |  |  | 1,630,898 | 1,169,627 | 593,463
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 697,088 |  |  |  | 682,642 |  |  |  | 155,330 |  |  |  | 697,088 | 682,642 | 155,330
Individually evaluated for impairment, Related loan balance | 2,792,239 |  |  |  | 2,931,143 |  |  |  | 1,629,643 |  |  |  | 2,792,239 | 2,931,143 | 1,629,643
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 933,810 |  |  |  | 486,985 |  |  |  | 438,133 |  |  |  | 933,810 | 486,985 | 438,133
Collectively evaluated for impairment, Balance in allowance | 116,951,359 |  |  |  | 122,034,834 |  |  |  | 127,016,047 |  |  |  | 116,951,359 | 122,034,834 | 127,016,047
Loans Receivable | Unallocated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ (53,619) |  |  |  | $ (120,319) |  |  |  | $ 132,727 | (53,619) | (120,319) | 132,727
Provision for credit losses |  |  |  |  |  |  |  |  |  |  |  |  | $ 202,084 | $ 66,700 | $ (253,046)
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans charged off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, end of year | $ 148,465 |  |  |  | $ (53,619) |  |  |  | $ (120,319) |  |  |  | $ 148,465 | $ (53,619) | $ (120,319)
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | $ 148,465 |  |  |  | $ (53,619) |  |  |  | $ (120,319) |  |  |  | $ 148,465 | $ (53,619) | $ (120,319)
Collectively evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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