CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Common Stock Warrants [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comp. Income, net [Member]
Balances at Dec. 31, 2009	$ 701,020,181	$ 89,462,633	$ 33,029,719	$ 3,348,402	$ 524,366,603	$ 43,372,743	$ 7,440,081
Balances, (in shares) at Dec. 31, 2009			33,029,719
Exercise of employee common stock options, stock appreciation rights, common stock warrants and related tax benefits	2,321,837	0	329,558	0	1,992,279	0	0
Exercise of employee common stock options, stock appreciation rights, common stock warrants and related tax benefits (in shares)			329,558
Issuance of restricted common shares, net of forfeitures	0	0	312,219	0	(312,219)	0	0
Issuance of restricted common shares, net of forfeitures (in shares)			312,219
Restricted shares withheld for taxes	(148,778)	0	(11,034)	0	(137,744)	0	0
Restricted shares withheld for taxes (in shares)			(11,034)
Compensation expense for restricted shares	1,774,345	0	0	0	1,774,345	0	0
Compensation expense for stock options	1,273,286	0	0	0	1,273,286	0	0
Accretion on preferred stock discount	0	992,496	0	0	0	(992,496)	0
Preferred dividends paid	(3,562,500)	0	0	0	0	(3,562,500)	0
Net income (loss)	(28,096,281)	0	0	0	0	(28,096,281)	0
Net unrealized gains on securities available-for-sale, net of deferred tax	11,946,683	0	0	0	0	0	11,946,683
Total comprehensive income (loss)	(16,149,598)
Balances at Sep. 30, 2010	686,528,773	90,455,129	33,660,462	3,348,402	528,956,550	10,721,466	19,386,764
Balances, (in shares) at Sep. 30, 2010			33,660,462
Balances at Dec. 31, 2010	677,457,285	90,788,682	33,870,380	3,348,402	530,829,019	12,996,202	5,624,600
Balances, (in shares) at Dec. 31, 2010	33,870,380		33,870,380
Exercise of employee common stock options, stock appreciation rights, common stock warrants and related tax benefits	965,030	0	131,923	0	833,107	0	0
Exercise of employee common stock options, stock appreciation rights, common stock warrants and related tax benefits (in shares)			131,923
Issuance of restricted common shares, net of forfeitures	0	0	287,565	0	(287,565)	0	0
Issuance of restricted common shares, net of forfeitures (in shares)			287,565
Issuance of Salary Stock Units	524,223	0	37,151	0	487,072	0	0
Issuance of Salary Stock Units (in shares)			37,151
Restricted shares withheld for taxes	(290,789)	0	(20,092)	0	(270,697)	0	0
Restricted shares withheld for taxes (in shares)			(20,092)
Compensation expense for restricted shares	2,428,988	0	0	0	2,428,988	0	0
Compensation expense for stock options	951,956	0	0	0	951,956	0	0
Accretion on preferred stock discount	0	983,448	0	0	0	(983,448)	0
Preferred dividends paid	(3,562,498)	0	0	0	0	(3,562,498)	0
Net income (loss)	35,977,570	0	0	0	0	35,977,570	0
Net unrealized gains on securities available-for-sale, net of deferred tax	9,922,126	0	0	0	0	0	9,922,126
Total comprehensive income (loss)	45,899,696
Balances at Sep. 30, 2011	$ 724,373,891	$ 91,772,130	$ 34,306,927	$ 3,348,402	$ 534,971,880	$ 44,427,826	$ 15,546,726
Balances, (in shares) at Sep. 30, 2011	34,306,927		34,306,927