Consolidated Statement of Changes in Stockholders' Equity (USD $)	Series F Noncumulative Perpetual Preferred Stock [Member] Preferred Stock [Member]	Series F Noncumulative Perpetual Preferred Stock [Member] Additional Paid-in Capital [Member]	Series F Noncumulative Perpetual Preferred Stock [Member]	Series E Non-Cumulative Perpetual Preferred Stock [Member] Preferred Stock [Member]	Series E Non-Cumulative Perpetual Preferred Stock [Member] Common Stock [Member]	Series E Non-Cumulative Perpetual Preferred Stock [Member] Additional Paid-in Capital [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member]	Total
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
Net income										12,617,767		488,473		13,106,240
Other comprehensive loss, net of tax											(48,031)			(48,031)
Common cash dividends declared										(381,042)				(381,042)
Preferred cash dividends declared and accrued										(3,496,085)				(3,496,085)
Redemption of Noncumulative Perpetual 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								31,554	249,316					280,870
Proceeds from issuance of common stock as a result of stock options exercised								17,876	155,428					173,304
Exchange of common stock in connection with stock options exercised								(611)	(7,125)					(7,736)
Exchange of 576 shares of common stock in connection with payroll taxes for restricted stock								(576)	(2,103)					(2,679)
Proceeds from exercise of warrants to purchase 54,000 shares of common stock issued in conjunction with the Series A Subordinated Notes								54,000	486,000					540,000
Stock-based compensation expense									849,760					849,760
Restricted stock awards								57,770	(57,770)
Purchase of noncontrolling interest									(2,250,471)			(2,531,748)		(4,782,219)
Distributions to noncontrolling interests												(8,263)		(8,263)
Balance at Dec. 31, 2012							54,867	5,039,448	78,912,791	53,326,542	4,706,683		(1,606,510)	140,433,821
Net income										14,938,245				14,938,245
Other comprehensive loss, net of tax											(18,350,669)			(18,350,669)
Common cash dividends declared										(459,312)				(459,312)
Preferred cash dividends declared and accrued										(3,168,302)				(3,168,302)
Issuance of 834,715 shares of common stock as a result of the acquisition of Community National Bancorporation, net								834,715	12,181,894					13,016,609
Conversion of 25,000 shares of Series E Non-cumulative Perpetual Preferred Stock to 2,057,502 shares of common stock				(25,000)	2,057,502	(2,032,502)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan								27,110	304,396					331,506
Proceeds from issuance of common stock as a result of stock options exercised								41,258	373,519					414,777
Exchange of common stock in connection with stock options exercised								(7,679)	(120,955)					(128,634)
Stock-based compensation expense									792,279					792,279
Tax benefit of nonqualified stock options exercised									62,371					62,371
Restricted stock awards								30,152	(30,152)
Exchange of shares of common stock in connection with restricted stock vested								(16,798)	(289,113)					(305,911)
Balance at Dec. 31, 2013							29,867	8,005,708	90,154,528	64,637,173	(13,643,986)		(1,606,510)	147,576,780
Net income										14,952,537				14,952,537
Other comprehensive loss, net of tax											11,708,770			11,708,770
Common cash dividends declared										(631,009)				(631,009)
Preferred cash dividends declared and accrued										(1,081,877)				(1,081,877)
Redemption of Noncumulative Perpetual Preferred Stock	(29,867)	(29,794,055)	(29,823,922)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan								25,321	353,566					378,887
Proceeds from issuance of common stock as a result of stock options exercised								23,659	218,095					241,754
Stock-based compensation expense									891,619					891,619
Tax benefit of nonqualified stock options exercised									42,954					42,954
Restricted stock awards								30,055	(30,055)
Exchange of shares of common stock in connection with restricted stock vested								(10,300)	(167,684)					(177,984)
Balance at Dec. 31, 2014								$ 8,074,443	$ 61,668,968	$ 77,876,824	$ (1,935,216)		$ (1,606,510)	$ 144,078,509