Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (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]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
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							3,889,215			3,889,215
Other comprehensive income, net of tax								5,230,784		5,230,784
Preferred cash dividends declared							(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 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 restricted stock vested					(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
Balance at Dec. 31, 2014					8,074,443	61,668,968	77,876,824	(1,935,216)	(1,606,510)	144,078,509
Net income							4,177,889			4,177,889
Other comprehensive income, net of tax								2,220,865		2,220,865
Proceeds from issuance of common stock as a result of stock purchased under the Employee Stock Purchase Plan					5,679	82,641				88,320
Proceeds from issuance of common stock as a result of stock options exercised					9,688	94,728				104,416
Stock compensation expense						367,775				367,775
Tax benefit of nonqualified stock options exercised						15,651				15,651
Restricted stock awards					26,502	(26,502)
Exchange of shares of common stock in connection with restricted stock vested					(3,272)	(54,188)				(57,460)
Balance at Mar. 31, 2015					$ 8,113,040	$ 62,149,073	$ 82,054,713	$ 285,649	$ (1,606,510)	$ 150,995,965