Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 3,265,144	$ 3,402,849
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	584,884	591,465
Provision for loan/lease losses	1,057,782	780,446
Stock-based compensation expense	293,798	326,245
Losses on other real estate owned, net	446,630	189,204
Amortization of premiums on securities, net	974,045	983,617
Loans originated for sale	(26,928,996)	(24,070,517)
Proceeds on sales of loans	30,382,098	24,972,257
Gains on sales of residential real estate loans, net	(291,151)	(291,433)
Gains on sales of government guaranteed portions of loans, net	(845,224)	(107,657)
Increase in cash value of bank-owned life insurance	(438,687)	(438,402)
Decrease in other assets	587,964	565,316
Decrease in other liabilities	(1,853,653)	(1,330,446)
Net cash provided by operating activities	7,234,634	5,572,944
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease in federal funds sold	26,560,000	20,785,000
Net (increase) decrease in interest-bearing deposits at financial institutions	(11,422,165)	1,262,389
Proceeds from sales of other real estate owned	15,989	209,383
Activity in securities portfolio:
Purchases	(187,650,573)	(159,077,553)
Calls, maturities and redemptions	82,114,256	98,751,724
Paydowns	12,893,508	5,720,417
Activity in restricted investment securities:
Purchases	(1,743,750)	(189,400)
Redemptions	2,193,900	334,000
Net increase in loans/leases originated and held for investment	(7,125,623)	(12,234,648)
Purchase of premises and equipment	(775,714)	(539,900)
Net cash used in investing activities	(84,940,172)	(44,978,588)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposit accounts	46,379,158	91,291,345
Net increase (decrease) in short-term borrowings	770,510	(63,635,950)
Activity in Federal Home Loan Bank advances:
Advances	46,000,000	4,000,000
Calls and maturities	(43,000,000)	(5,000,000)
Net increase in other borrowings	2,150	2,025
Payment of cash dividends on common and preferred stock	(1,002,789)	(1,214,611)
Cash and due from banks, beginning	61,568,446	53,136,710
Cash and due from banks, ending	33,254,137	39,239,858
Supplemental disclosure of cash flow information, cash payments for:
Interest	4,472,977	5,141,834
Income/franchise taxes	717,300	591,000
Supplemental schedule of noncash investing activities:
Change in accumulated other comprehensive income, unrealized losses on securities available for sale, net	(836,358)	(1,517,235)
Exchange of shares of common stock in connection with payroll taxes for restricted stock and in connection with stock options exercised	(424,587)	(2,679)
Transfers of loans to other real estate owned	187,500	185,000
Common Stock [Member]
Activity in Federal Home Loan Bank advances:
Proceeds from issuance of common stock, net	242,200	65,983
Net cash provided by financing activities	49,391,229	25,508,792
Net decrease in cash and due from banks	$ (28,314,309)	$ (13,896,852)