Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash Flows from Operating Activities:
Net income	$ 27,686,787	$ 16,927,881	$ 14,952,537
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	3,424,140	3,065,031	2,812,645
Provision for loan/lease losses	7,478,166	6,870,900	6,807,000
Deferred income taxes	(3,066,407)	(2,004,532)	(1,165,009)
Stock-based compensation expense	947,174	941,469	891,619
Deferred compensation expense accrued	1,155,549	1,023,827	1,311,627
Losses (gains) on sale of other real estate owned, net	243,858	(1,021,242)	447,272
Amortization of premiums on securities, net	1,302,962	1,040,275	1,809,804
Securities gains, net	(4,592,398)	(798,983)	(92,363)
Loans originated for sale	(74,329,667)	(38,748,100)	(58,128,415)
Proceeds on sales of loans	77,850,553	40,362,697	61,435,064
Gains on sales of residential real estate loans, net	(431,313)	(322,872)	(460,721)
Gains on sales of government guaranteed portions of loans, net	(3,159,073)	(1,304,575)	(2,040,638)
Losses on debt extinguishment, net	4,577,668	7,185,601
Amortization of core deposit intangible	442,849	199,512	199,512
Accretion of acquisition fair value adjustments, net	(3,718,160)	(367,009)	(674,539)
Increase in cash value of bank-owned life insurance	(1,771,396)	(1,762,107)	(1,721,507)
Increase in other assets	(943,891)	(3,910,486)	(1,198,107)
Increase in other liabilities	10,285,420	2,721,335	414,134
Net cash provided by operating activities	43,382,821	30,098,622	25,599,915
Cash Flows from Investing Activities:
Net (increase) decrease in federal funds sold	(1,709,000)	26,930,000	(7,345,000)
Net increase in interest-bearing deposits at financial institutions	(12,904,803)	(979,283)	(2,289,765)
Proceeds from sales of other real estate owned	2,084,696	7,696,026	1,593,714
Purchase of derivative instruments			(2,071,650)
Activity in securities portfolio:
Purchases	(179,598,630)	(232,092,732)	(76,256,503)
Calls, maturities and redemptions	117,876,284	211,942,737	35,247,090
Paydowns	33,169,638	15,476,369	23,611,559
Sales	134,188,737	81,410,368	78,476,422
Activity in restricted investment securities:
Purchases	(1,098,200)	(3,752,450)	(1,912,050)
Redemptions	2,450,000	4,476,100	3,380,100
Net increase in loans/leases originated and held for investment	(187,496,180)	(172,786,032)	(180,325,359)
Purchase of premises and equipment	(6,032,416)	(4,394,255)	(2,035,855)
Net cash paid for Community State Bank acquisition	(69,905,355)
Net cash used in investing activities	(168,975,229)	(66,073,152)	(129,927,297)
Term advances		5,000,000	6,000,000
Calls and maturities	(24,000,000)	(26,000,000)	(27,850,000)
Net change in short-term and overnight advances	20,500,000	47,000,000	(6,000,000)
Prepayments	(31,008,668)	(84,401,601)
Cash Flows from Financing Activities:
Net increase in deposits	302,390,928	200,988,645	32,695,797
Net (decrease) increase in short-term borrowings	(104,691,329)	(123,688,954)	119,058,703
Activity in other borrowings:
Proceeds from other borrowings	35,000,000		10,000,000
Calls, maturities and scheduled principal payments		(7,350,000)	(2,125,000)
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	(1,981,541)	(782,054)	(1,964,608)
Proceeds from issuance of common stock, net	2,105,774	1,552,673	620,641
Redemption of 29,867 shares of Series F Noncumulative Perpetual Preferred Stock, net			29,823,922
Net cash provided by financing activities	154,420,080	39,481,832	100,611,611
Net (decrease) increase in cash and due from banks	28,827,672	3,507,302	(3,715,771)
Cash and due from banks, beginning	41,742,321	38,235,019	41,950,790
Cash and due from banks, ending	70,569,993	41,742,321	38,235,019
Supplemental Disclosures of Cash Flow Information, cash payments for:
Interest	11,926,012	14,027,512	16,826,619
Income and franchise taxes	10,758,611	2,619,288	4,541,000
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	(335,760)	(188,613)	11,708,770
Exchange of shares of common stock in connection with payroll taxes for restricted stock and options exercised	(568,875)	(68,706)	(177,984)
Tax benefit of nonqualified stock options exercised	394,149	93,096	42,954
Transfers of loans to other real estate owned	51,000	1,577,060	5,594,256
Due from broker for sales of securities			2,290,930
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
Decrease (increase) in the fair market value of interest rate swap assets and liabilities	706,244	(1,568,548)	(59,588)
Dividends payable	522,573	468,583	315,955
Consideration paid:
Goodwill	13,110,913	3,222,688	3,222,688
Series F Noncumulative Perpetual Preferred Stock Two [Member]
Activity in other borrowings:
Redemption of 29,867 shares of Series F Noncumulative Perpetual Preferred Stock, net			$ (29,823,922)
Common Stock Offering 1 [Member]
Activity in other borrowings:
Proceeds from issuance of common stock, net		$ 63,484,123
Common Stock Offering 2 [Member]
Activity in other borrowings:
Proceeds from issuance of common stock, net	29,828,916
Community State Bank Acquisition [Member]
Fair value of assets acquired:
Cash and due from banks *	10,094,645
Federal funds sold	698,000
Interest-bearing deposits at financial institutions	14,730,157
Securities	102,640,029
Loans/leases receivable, net	419,029,277
Premises and equipment, net	20,684,880
Core deposit intangible	6,352,653
Restricted investment securities	1,512,900
Other real estate owned	650,000
Other assets	5,283,937
Total assets acquired	581,676,478
Fair value of liabilities assumed:
Deposits	486,298,262
FHLB advances	20,368,877
Other liabilities	4,897,564
Total liabilities assumed	511,564,703
Net assets acquired	70,111,775
Consideration paid:
Cash paid *	80,000,000
Total consideration paid	80,000,000
Goodwill	$ 9,888,225