Consolidated Statement of Changes in Stockholders' Equity (USD $)	Preferred Stock [Member] Series E Preferred Stock [Member]	Preferred Stock [Member] Series F Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member] Series E Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Series E Preferred Stock [Member]	Additional Paid-in Capital [Member] Series F Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member] Series E Preferred Stock [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Series E Preferred Stock [Member]	Series F Preferred Stock [Member]	Total
Balance, December 31, 2008 at Dec. 31, 2008			$ 568		$ 4,630,883			$ 43,090,268	$ 40,893,304	$ 3,628,360		$ 1,858,298	$ (1,606,510)			$ 92,495,171
Comprehensive income:
Net income									1,771,908			276,923				2,048,831
Other comprehensive income (loss)										(3,492,752)						(3,492,752)
Comprehensive income																(1,443,921)
Common cash dividends declared, $0.08 per share									(362,811)							(362,811)
Preferred cash dividends declared and accrued									(3,467,989)							(3,467,989)
Discount accretion on cumulative preferred stock								375,935	(375,935)
Proceeds from issuance of 38,237 shares of preferred stock and common stock warrant			38,237					38,014,586								38,052,823
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan					28,575			205,585								234,160
Exchange of 2,550 shares of common stock in connection with stock options exercised					(830)			(6,889)								(7,719)
Exchange of shares of common stock in connection with payroll taxes for restricted stock					(830)			(6,889)								(7,719)
Stock compensation expense								609,713								609,713
Restricted stock award					15,908			(15,908)
Purchase of noncontrolling interests								(78,960)				(231,040)				(310,000)
Distributions to noncontrolling interests												(204,551)				(204,551)
Balance at Dec. 31, 2009			38,805		4,674,536			82,194,330	38,458,477	135,608		1,699,630	(1,606,510)			125,594,876
Exchange of 268 shares of Series B Non-Cumulative Perpetual Preferred Stock for 13,400 shares of Series E Non-Cumulative Perpetual Convertible Preferred Stock			13,132					(13,132)
Exchange of 300 shares of Series C Non-Cumulative Perpetual Preferred Stock for 7,500 shares of Series E Non-Cumulative Perpetual Convertible Preferred Stock			7,200					(7,200)
Proceeds from issuance of 4,100 shares of Series E Non-Cumulative Perpetual Convertible Preferred Stock	4,100					3,183,133								3,187,233
Proceeds from issuance of warrants to purchase 54,000 shares of common stock in conjunction with the issuance of Series A Subordinated Notes						84,240								84,240
Proceeds from issuance of common stock as a result of stock options exercised				5,754		37,621								43,375
Comprehensive income:
Net income									6,586,679			221,047				6,807,726
Other comprehensive income (loss)										568,557						568,557
Comprehensive income																7,376,283
Common cash dividends declared, $0.08 per share									(366,152)							(366,152)
Preferred cash dividends declared and accrued									(3,679,100)							(3,679,100)
Discount accretion on cumulative preferred stock								449,004	(449,004)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				28,907		192,362								221,269
Exchange of 2,550 shares of common stock in connection with stock options exercised				(367)		(2,730)								(3,097)
Exchange of shares of common stock in connection with payroll taxes for restricted stock				(367)		(2,730)								(3,097)
Stock compensation expense						533,271								533,271
Restricted stock award				23,598		(23,598)
Purchase of noncontrolling interests						(149,032)					(270,968)			(420,000)
Distributions to noncontrolling interests											(1,490)			(1,490)
Balance at Dec. 31, 2010			63,237		4,732,428			86,478,269	40,550,900	704,165		1,648,219	(1,606,510)			132,570,708
Proceeds from issuance of common stock as a result of stock options exercised					36,459			216,765								253,224
Comprehensive income:
Net income									9,691,648			438,221				10,129,869
Other comprehensive income (loss)										4,050,549						4,050,549
Comprehensive income																14,180,418
Common cash dividends declared, $0.08 per share									(372,761)							(372,761)
Preferred cash dividends declared and accrued									(3,694,441)							(3,694,441)
Discount accretion on cumulative preferred stock								1,589,444	(1,589,444)
Proceeds from issuance of 40,090 shares of Series F Non-Cumulative Perpetual Preferred Stock		40,090					39,956,832								39,996,922
Redemption of 38,237 shares of Series D Cumulative Perpetual Preferred Stock			(38,237)					(38,198,763)								(38,237,000)
Redemption of 521,888 shares of common stock warrants issued in conjunction with Series D Cumulative Perpetual Preferred Stock								(1,100,000)								(1,100,000)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan					36,174			207,592								243,766
Exchange of 2,550 shares of common stock in connection with stock options exercised					(2,550)			(17,101)								(19,651)
Exchange of shares of common stock in connection with payroll taxes for restricted stock					(2,550)			(17,101)								(19,651)
Stock compensation expense								646,419								646,419
Restricted stock award					76,924			(76,924)
Distributions to noncontrolling interests												(34,902)				(34,902)
Balance at Dec. 31, 2011			$ 65,090		$ 4,879,435			$ 89,702,533	$ 44,585,902	$ 4,754,714		$ 2,051,538	$ (1,606,510)			$ 144,432,702