Consolidated Balance Sheets - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Cash and due from banks	$ 73,406,657	$ 75,721,663
Federal funds sold	33,070,000	30,197,000
Interest-bearing deposits at financial institutions	96,590,367	55,765,012
Securities held to maturity, at amortized cost	395,421,195	379,474,205
Securities available for sale, at fair value	255,323,442	272,907,907
Total securities	650,744,637	652,382,112
Loans receivable held for sale	2,557,907	645,001
Loans/leases receivable held for investment	3,650,828,460	2,963,840,399
Gross loans/leases receivable	3,653,386,367	2,964,485,400
Less allowance for estimated losses on loans/leases	(43,077,457)	(34,355,728)
Net loans/leases receivable	3,610,308,910	2,930,129,672
Bank-owned life insurance	67,443,063	59,059,494
Premises and equipment, net	73,828,512	62,838,255
Restricted investment securities	28,679,400	19,782,525
Other real estate owned, net	12,203,780	13,558,308
Goodwill	73,618,426	28,334,092
Core deposit intangible	16,136,914	9,078,953
Other assets	56,701,829	45,817,687
Total assets	4,792,732,495	3,982,664,773
Liabilities and Stockholders' Equity
Noninterest-bearing	802,090,334	789,547,696
Interest-bearing	2,986,186,588	2,477,107,360
Total deposits	3,788,276,922	3,266,655,056
Short-term borrowings	12,929,499	13,993,122
Federal Home Loan Bank advances	359,128,925	192,000,000
Other borrowings	73,950,426	66,000,000
Junior subordinated debentures	37,626,070	37,486,487
Other liabilities	63,433,264	53,242,979
Total liabilities	4,335,345,106	3,629,377,644
Stockholders' Equity:
Common stock, $1 par value; shares authorized 20,000,000 September 2018 - 15,673,760 shares issued and outstanding December 2017 - 13,918,168 shares issued and outstanding	15,673,760	13,918,168
Additional paid-in capital	269,373,303	189,077,550
Retained earnings	179,826,524	151,962,661
Accumulated other comprehensive loss:
Securities available for sale	(7,347,979)	(866,223)
Derivatives	(138,219)	(805,027)
Total stockholders' equity	457,387,389	353,287,129
Total liabilities and stockholders' equity	$ 4,792,732,495	$ 3,982,664,773