Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 9,860,738	$ 7,271,299
Depreciation	1,740,621	1,866,403
Provision for loan/lease losses	3,325,109	5,196,850
Amortization of offering costs on subordinated debentures	10,738	10,738
Stock-based compensation expense	672,703	547,087
Losses on other real estate owned, net	1,324,468	90,492
Amortization of premiums on securities, net	2,950,609	2,541,408
Securities gains	(104,600)	(1,472,528)
Other-than-temporary impairment losses on securities	62,400	118,847
Loans originated for sale	(90,563,711)	(65,240,469)
Proceeds on sales of loans	90,077,297	75,960,589
Gains on sales of loans, net	(1,965,957)	(1,923,185)
Prepayment fees on Federal Home Loan Bank advances		832,099
Increase in cash value of bank-owned life insurance	(1,196,987)	(1,032,493)
Decrease in other assets	3,090,716	707,321
Increase in other liabilities	1,467,552	955,174
Net cash provided by operating activities	20,751,696	26,429,632
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease in federal funds sold	15,060,000	56,170,000
Net (increase) decrease in interest-bearing deposits at financial institutions	(22,686,336)	15,080,252
Proceeds from sales of other real estate owned	4,201,516	8,376,898
Purchases	(363,501,993)	(458,081,700)
Calls, maturities and redemptions	292,291,109	302,145,002
Paydowns	25,174,348	4,977,152
Sales	19,215,075	54,326,191
Purchases	(3,466,800)	(245,000)
Redemptions	3,939,600	1,675,700
Purchases of bank-owned life insurance		(7,000,000)
Net increase in loans/leases originated and held for investment	(45,934,981)	(48,043,333)
Purchase of premises and equipment	(1,589,217)	(1,693,870)
Net cash used in investing activities	(77,297,679)	(72,312,708)
Net increase in deposit accounts	137,777,646	92,653,389
Net increase (decrease) in short-term borrowings	(72,647,752)	2,431,992
Advances	14,000,000	5,000,000
Calls and maturities	(22,400,000)	(24,000,000)
Prepayments		(15,832,099)
Net increase (decrease) in other borrowings	2,006,074	(9,941,030)
Payment of cash dividends on common and preferred stock	(3,278,112)	(3,274,991)
Purchase of noncontrolling interest	(1,679,532)
Net cash provided by financing activities	43,973,834	49,283,981
Net increase (decrease) in cash and due from banks	(12,572,149)	3,400,905
Cash and due from banks, beginning	53,136,710	42,030,806
Cash and due from banks, ending	40,564,561	45,431,711
Interest	15,225,564	18,521,222
Income/franchise taxes	916,000	1,196,948
Change in accumulated other comprehensive income, unrealized gains on securities available for sale, net	1,367,388	3,468,469
Transfers of loans to other real estate owned	2,143,017	8,220,271
Liability for purchase of noncontrolling interest	2,847,687
Series F Noncumulative Perpetual Preferred Stock [Member]
CASH FLOWS FROM INVESTING ACTIVITIES
Redemption of Preferred Stock	(10,223,000)
Proceeds from issuance of stock		40,074,341
Series D Cumulative Perpetual Preferred Stock [Member]
CASH FLOWS FROM INVESTING ACTIVITIES
Redemption of Preferred Stock		(38,237,000)
Common Stock [Member]
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from issuance of stock	$ 418,510	$ 409,379