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Income Taxes Reconciliation of Income Tax (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Anticipated income tax expense | $ 9,733,482 | $ 6,115,306 | $ 4,626,555
State income taxes, net of federal income tax benefit | 52,974 | 22,304 | 55,188
Tax-exempt interest income (net of amortization) | (1,074,504) | (981,712) | (876,365)
Other, net | (95,952) | 72,102 | 10,622
Total | $ 8,616,000 | $ 5,228,000 | $ 3,816,000
U.S. Federal statutory income tax rate | 34.60% | 34.40% | 34.30%

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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