Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)	Preferred Stock [Member] Series F Noncumulative Perpetual Preferred Stock [Member]	Preferred Stock [Member] Series D Cumulative Perpetual Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member] Series F Noncumulative Perpetual Preferred Stock [Member]	Additional Paid-in Capital [Member] Series D Cumulative Perpetual Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Series F Noncumulative Perpetual Preferred Stock [Member]	Series D Cumulative Perpetual Preferred Stock [Member]	Total
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
Comprehensive income														885,930
Preferred cash dividends declared and accrued								(915,462)						(915,462)
Discount accretion on cumulative preferred stock							116,909	(116,909)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				9,081			49,249							58,330
Proceeds from issuance of common stock as a result of stock options exercised				24,300			146,067							170,367
Exchange of common stock				(2,171)			(14,070)							(16,241)
Stock compensation expense							206,569							206,569
Restricted stock awards				69,924			(69,924)
Other adjustments to noncontrolling interests										(2,065)				(2,065)
Net income								2,124,960		106,524				2,231,484
Other comprehensive income (loss), net of tax									(1,345,554)					(1,345,554)
Balance at Mar. 31, 2011			63,237	4,833,562			86,913,069	41,643,489	(641,389)	1,752,678	(1,606,510)			132,958,136
Balance at Dec. 31, 2010			63,237								(1,606,510)			132,570,708
Comprehensive income														10,739,768
Redemption of preferred stock		(38,237)				(38,198,763)							(38,237,000)
Net income														7,271,299
Other comprehensive income (loss), net of tax														3,468,469
Balance September 30 at Sep. 30, 2011			65,090								(1,606,510)			143,168,873
Balance at Mar. 31, 2011			63,237	4,833,562			86,913,069	41,643,489	(641,389)	1,752,678	(1,606,510)			132,958,136
Comprehensive income														5,182,942
Common cash dividends declared								(185,863)						(185,863)
Preferred cash dividends declared and accrued								(915,462)						(915,462)
Discount accretion on cumulative preferred stock							120,280	(120,280)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				11,355			61,582							72,937
Proceeds from issuance of common stock as a result of stock options exercised				10,967			65,205							76,172
Exchange of common stock				(379)			(3,033)							(3,412)
Stock compensation expense							141,370							141,370
Other adjustments to noncontrolling interests										(2,066)				(2,066)
Net income								2,674,969		98,245				2,773,214
Other comprehensive income (loss), net of tax									2,409,728					2,409,728
Balance at Jun. 30, 2011			63,237	4,855,505			87,298,473	43,096,853	1,768,339	1,848,857	(1,606,510)			137,324,754
Comprehensive income														4,670,896
Preferred cash dividends declared and accrued								(835,802)						(835,802)
Discount accretion on cumulative preferred stock							1,352,256	(1,352,256)
Proceeds from the issuance of 40,090 shares of Series F Non-Cumulative Perpetual Preferred Stock	40,090				40,034,251							40,074,341
Redemption of preferred stock		(38,237)				(38,198,763)							(38,237,000)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				7,975			43,251							51,226
Stock compensation expense							149,160							149,160
Restricted stock awards				5,000			(5,000)
Other adjustments to noncontrolling interests										(28,702)				(28,702)
Net income								2,163,155		103,446				2,266,601
Other comprehensive income (loss), net of tax									2,404,295					2,404,295
Balance September 30 at Sep. 30, 2011			65,090	4,868,480			90,673,628	43,071,950	4,172,634	1,923,601	(1,606,510)			143,168,873
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
Comprehensive income														1,885,614
Preferred cash dividends declared and accrued								(938,625)						(938,625)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				7,767			55,566							63,333
Proceeds from issuance of common stock as a result of stock options exercised				276			2,374							2,650
Exchange of common stock				(576)			(2,103)							(2,679)
Stock compensation expense							326,245							326,245
Restricted stock awards				57,770			(57,770)
Other adjustments to noncontrolling interests										(2,066)				(2,066)
Net income								3,236,818		166,031				3,402,849
Other comprehensive income (loss), net of tax									(1,517,235)					(1,517,235)
Balance at Mar. 31, 2012			65,090	4,944,672			90,026,845	46,884,095	3,237,479	2,215,503	(1,606,510)			145,767,174
Comprehensive income														4,514,424
Common cash dividends declared								(189,091)						(189,091)
Preferred cash dividends declared and accrued								(935,786)						(935,786)
Redemption of preferred stock	(10,223)				(10,212,777)							(10,223,000)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				10,856			78,055							88,911
Proceeds from issuance of common stock as a result of stock options exercised				9,090			79,902							88,992
Exchange of 611 shares of common stock in connection with stock options exercised				(611)			(7,125)							(7,736)
Proceeds from exercise of warrants to purchase shares of common stock issued in conjunction with the Series A Subordinated Notes				4,300			38,700							43,000
Stock compensation expense							177,269							177,269
Other adjustments to noncontrolling interests										(2,065)				(2,065)
Net income								3,072,156		201,223				3,273,379
Other comprehensive income (loss), net of tax									1,241,045					1,241,045
Balance at Jun. 30, 2012			54,867	4,968,307			80,180,869	48,831,374	4,478,524	2,414,661	(1,606,510)			139,322,092
Comprehensive income														4,828,088
Preferred cash dividends declared and accrued								(810,837)						(810,837)
Purchase of noncontrolling interest							(2,133,417)			(2,393,802)				(4,527,219)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan				7,642			58,326							65,968
Proceeds from issuance of common stock as a result of stock options exercised				7,075			58,996							66,071
Proceeds from exercise of warrants to purchase shares of common stock issued in conjunction with the Series A Subordinated Notes				1,000			9,000							10,000
Stock compensation expense							169,189							169,189
Other adjustments to noncontrolling interests										(2,066)				(2,066)
Net income								3,057,333		127,177				3,184,510
Other comprehensive income (loss), net of tax									1,643,578					1,643,578
Balance at Sep. 30, 2012														139,121,286
Balance September 30 at Sep. 30, 2012			$ 54,867	$ 4,984,024			$ 78,342,963	$ 51,077,870	$ 6,122,102	$ 145,970	$ (1,606,510)			$ 139,121,286