Consolidated Statements of Income - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and dividend income:
Loans/leases, including fees		$ 117,465,275	$ 91,235,049	$ 74,615,499
Securities:
Taxable		5,144,336	4,585,300	6,772,244
Nontaxable		11,253,351	9,686,844	7,782,370
Interest-bearing deposits at financial institutions		873,988	393,048	304,602
Restricted investment securities		631,049	522,047	503,764
Federal funds sold		149,319	45,447	24,774
Total interest and dividend income		135,517,318	106,467,735	90,003,253
Interest expense:
Deposits		13,011,906	6,018,366	4,495,538
Short-term borrowings		113,981	93,934	210,306
Federal Home Loan Bank advances		1,981,593	1,284,212	3,511,541
Other borrowings		2,878,879	3,317,513	4,233,193
Junior subordinated debentures		1,465,678	1,236,933	1,255,951
Total interest expense		19,452,037	11,950,958	13,706,529
Net interest income		116,065,281	94,516,777	76,296,724
Provision for loan/lease losses		8,469,919	7,478,166	6,870,900
Net interest income after provision for loan/lease losses		107,595,362	87,038,611	69,425,824
Noninterest income:
Trust department fees		7,187,820	6,164,137	6,131,209
Investment advisory and management fees		3,869,699	2,992,811	2,971,964
Deposit service fees		5,919,317	4,439,455	3,784,935
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
Swap fee income		3,094,939	1,708,204	1,717,552
Securities gains (losses), net		(87,885)	4,592,398	798,983
Earnings on bank-owned life insurance		1,802,443	1,771,396	1,762,107
Debit card fees		2,941,703	1,814,488	1,244,912
Correspondent banking fees		915,647	1,050,142	1,190,411
Other		3,266,213	2,913,458	3,133,801
Total noninterest income		30,482,292	31,036,875	24,363,321
Noninterest expenses:
Salaries and employee benefits		55,722,288	46,317,060	42,967,915
Occupancy and equipment expense		10,938,037	8,404,605	7,042,706
Professional and data processing fees		10,757,057	7,113,443	5,523,447
Acquisition costs		1,068,918	1,400,004
Post-acquisition compensation, transition and integration costs		4,309,565	1,041,169
FDIC insurance, other insurance and regulatory fees		2,752,270	2,549,314	2,724,968
Loan/lease expense		1,163,708	662,299	882,591
Net cost of (income from) operations of other real estate		1,599	591,303	(1,092,401)
Advertising and marketing		2,624,951	2,127,566	1,900,539
Bank service charges		1,770,942	1,692,957	1,486,265
Losses on debt extinguishment, net			4,577,668	7,185,601
Correspondent banking expense		807,077	750,646	703,495
CDI amortization		1,000,561	442,849	199,512
Other		4,507,724	3,815,028	3,667,384
Total noninterest expenses		97,424,697	81,485,912	73,192,022
Income before income taxes		40,652,957	36,589,574	20,597,123
Federal and state income tax expense		4,946,450	8,902,787	3,669,242
Net income		$ 35,706,507	$ 27,686,787	$ 16,927,881
Basic earnings per common share (in dollars per share)		$ 2.68	$ 2.20	$ 1.64
Diluted earnings per common share (in dollars per share)		$ 2.61	$ 2.17	$ 1.61
Weighted average common shares outstanding (in shares)	[1]	13,325,128	12,570,767	10,345,286
Weighted average common and common equivalent shares outstanding (in shares)		13,680,472	12,766,003	10,499,841
Cash dividends declared per common share (in dollars per share)		$ 0.20	$ 0.16	$ 0.08

[1] The increase in weighted average common shares outstanding from 2015 to 2016 was primarily due to the common stock issuance that occurred in conjunction with the CSB acquisition.