Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)	Preferred Stock [Member] Series F Noncumulative 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]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Treasury Stock [Member] Series F Noncumulative Perpetual Preferred Stock [Member]	Treasury Stock [Member]	Total
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						3,265,144				3,265,144	3,265,144
Other comprehensive income (loss), net of tax							(836,358)			(836,358)	(836,358)
Preferred cash dividends declared and accrued						(810,837)				(810,837)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan			5,884		63,487					69,371
Proceeds from issuance of common stock as a result of stock options exercised			19,278		153,550					172,828
Exchange of 7,048 shares of common stock in connection with stock options exercised			(7,048)		(111,628)					(118,676)
Stock-based compensation expense					293,798					293,798
Tax benefit of nonqualified stock options exercised					35,251					35,251
Restricted stock awards			16,798		(16,798)
Exchange of shares of common stock in connection with payroll taxes for restricted stock			(16,798)		(289,113)					(305,911)
Balance at Mar. 31, 2013		54,867	5,057,562		79,041,338	55,780,849	3,870,325	(1,606,510)		142,198,431
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	147,576,780
Net income						3,889,215				3,889,215	3,889,215
Other comprehensive income (loss), net of tax							5,230,784			5,230,784	5,230,784
Preferred cash dividends declared and accrued						(708,008)				(708,008)
Redemption of 15,000 shares of Series F Noncumulative Perpetual Preferred Stock	(15,000)			(14,985,000)					(15,000,000)
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan			6,189		78,256					84,445
Proceeds from issuance of common stock as a result of stock options exercised			9,814		85,582					95,396
Stock-based compensation expense					347,752					347,752
Tax benefit of nonqualified stock options exercised					18,647					18,647
Restricted stock awards			27,197		(27,197)
Exchange of shares of common stock in connection with payroll taxes for restricted stock			(10,300)		(167,684)					(177,984)
Balance at Mar. 31, 2014		$ 14,867	$ 8,038,608		$ 75,504,884	$ 67,818,380	$ (8,413,202)	$ (1,606,510)		$ 141,357,027	$ 141,357,027