Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)
Cash Flows from Operating Activities:
Net income	$ 35,706,507		$ 27,686,787		$ 16,927,881
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	3,948,934		3,424,140		3,065,031
Provision for loan/lease losses	8,469,919		7,478,166		6,870,900
Deferred income taxes	(6,029,555)		(3,066,407)		(2,004,532)
Stock-based compensation expense	1,187,036		947,174		941,469
Deferred compensation expense accrued	1,425,717		1,171,406		1,023,827
Losses (gains) on sale of other real estate owned, net	(151,211)		243,858		(1,021,242)
Amortization of premiums on securities, net	1,839,196		1,302,962		1,040,275
Securities (gains) losses, net	87,885		(4,592,398)		(798,983)
Loans originated for sale	(49,578,773)		(74,329,667)		(38,748,100)
Proceeds on sales of loans	51,641,668		77,850,553		40,362,697
Gains on sales of residential real estate loans, net	(408,655)		(431,313)		(322,872)
Gains on sales of government guaranteed portions of loans, net	(1,163,741)		(3,159,073)		(1,304,575)
Losses on debt extinguishment, net			4,577,668		7,185,601
Amortization of core deposit intangible	1,000,561		442,849		199,512
Accretion of acquisition fair value adjustments, net	(5,040,873)		(3,718,160)		(367,009)
Increase in cash value of bank-owned life insurance	(1,802,443)		(1,771,396)		(1,762,107)
(Increase) decrease in other assets	826,449		(943,891)		(3,910,486)
Increase (decrease) in other liabilities	(8,245,340)		10,269,563		2,721,335
Net cash provided by operating activities	33,713,281		43,382,821		30,098,622
Cash Flows from Investing Activities:
Net decrease (increase) in federal funds sold	(7,940,000)		(1,709,000)		26,930,000
Net decrease (increase) in interest-bearing deposits at financial institutions	12,137,820		(12,904,803)		(979,283)
Proceeds from sales of other real estate owned	1,138,520		2,084,696		7,696,026
Activity in securities portfolio:
Purchases	(179,785,944)		(179,598,630)		(232,092,732)
Calls, maturities and redemptions	43,010,478		117,876,284		211,942,737
Paydowns	38,495,801		33,169,638		15,476,369
Sales	71,091,580		134,188,737		81,410,368
Activity in restricted investment securities:
Purchases	(4,824,000)		(1,098,200)		(3,752,450)
Redemptions	515,000		2,450,000		4,476,100
Net increase in loans/leases originated and held for investment	(375,226,301)		(187,496,180)		(172,786,032)
Purchase of premises and equipment	(5,760,802)		(6,032,416)		(4,394,255)
Net cash paid for acquisitions	(3,368,909)		(69,905,355)
Net cash used in investing activities	(410,516,757)		(168,975,229)		(66,073,152)
Cash Flows from Financing Activities:
Net increase in deposits	385,082,234		302,390,928		200,988,645
Net decrease in short-term borrowings	(39,080,308)		(104,691,329)		(123,688,954)
Activity in Federal Home Loan Bank advances:
Term advances	1,600,000				5,000,000
Calls and maturities	(8,000,000)		(24,000,000)		(26,000,000)
Net change in short-term and overnight advances	60,900,000		20,500,000		47,000,000
Prepayments	(4,108,027)		(31,008,668)		(84,401,601)
Activity in other borrowings:
Proceeds from other borrowings	7,000,000		35,000,000
Calls, maturities and scheduled principal payments	(21,000,000)				(7,350,000)
Prepayments			(69,769,000)		(34,559,000)
Retirement of junior subordinated debentures			(3,955,000)		(1,762,000)
Payment of cash dividends on common and preferred stock	(2,494,260)		(1,981,541)		(782,054)
Net cash provided by financing activities	381,955,146		154,420,080		39,481,832
Net increase in cash and due from banks	5,151,670		28,827,672		3,507,302
Cash and due from banks, beginning	70,569,993		41,742,321		38,235,019
Cash and due from banks, ending	75,721,663		70,569,993		41,742,321
Supplemental Disclosures of Cash Flow Information, cash payments for:
Interest	19,053,645		11,926,012		14,027,512
Income and franchise taxes	13,039,516		10,758,611		2,619,288
Supplemental Schedule of Noncash Investing and Financing Activities:
Change in accumulated other comprehensive income, unrealized gains (losses) on securities available for sale and derivative instruments, net	1,092,153		(335,760)		(188,613)
Exchange of shares of common stock in connection with payroll taxes for restricted stock and options exercised	(1,009,797)		(568,875)		(68,706)
Tax benefit of nonqualified stock options exercised			394,149		93,096
Transfers of loans to other real estate owned	9,022,514		51,000		1,577,060
Due to broker for purchases of securities			2,655,492
Tax basis adjustment related to the acquisition of noncontrolling interest in m2 Lease Funds			2,132,415
Increase (decrease) in the fair market value of interest rate swap assets and liabilities	2,058,957		(706,244)		1,568,548
Dividends payable	692,874		522,573		468,583
Fair value of assets acquired:
Cash and due from banks	4,434,511	[1]	10,094,645	[1]		[1]
Federal funds sold			698,000
Interest-bearing deposits at financial institutions	3,953,907		14,730,157
Securities	49,703,419		102,640,029
Loans receivable, net	192,517,677		419,029,277
Premises and equipment, net	4,808,343		20,684,880
Restricted investment securities	476,500		1,512,900
Other real estate owned			650,000
Core deposit intangible	2,698,301		6,352,653
Other assets	997,810		5,283,937
Total assets acquired	259,590,468		581,676,478
Fair value of liabilities assumed:
Deposits	212,467,514		486,298,262
Short-term borrowings	13,102,043
FHLB advances	4,108,027		20,368,877
Junior subordinated debentures	3,857,275
Other liabilities	2,595,883		4,897,564
Total liabilities assumed	236,130,742		511,564,703
Net assets acquired	23,459,726		70,111,775
Consideration paid:
Cash paid	7,803,420	[2]	80,000,000	[2]		[2]
Common stock	30,879,485
Total consideration paid	38,682,905		80,000,000
Goodwill	15,223,179		9,888,225
Common Stock Offering 1 [Member]
Activity in other borrowings:
Net proceeds from common stock offering			29,828,916		63,484,123
Common Stock Offering 2 [Member]
Activity in other borrowings:
Net proceeds from common stock offering	$ 2,055,507		$ 2,105,774		$ 1,552,673

[1] Net cash paid at closing totaled $69,905,355

[2] Net cash paid at closing totaled $69,905,355 for acquisition of CSB in 2016.