Income Taxes Reconciliation of Income Tax (Details) - USD ($)	12 Months Ended
	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%