Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic Net Income per Common Share Available to Common Stockholders [Abstract]
Net income	$ 3,915,000	$ 3,910,000	$ 11,551,000	$ 11,103,000
Preferred stock dividends	(1,105,000)	(1,104,000)	(3,313,000)	(3,313,000)
Net income available to common stockholders	2,810,000	2,806,000	8,238,000	7,790,000
Weighted average common shares outstanding	5,881,681	5,935,383	5,881,974	5,947,476
Basic earnings per common share	$ 0.48	$ 0.47	$ 1.40	$ 1.31
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]
Net income available to common stockholders	2,810,000	2,806,000	8,238,000	7,790,000
Effect of assumed preferred stock conversion	1,105,000	0	3,313,000	0
Net income applicable to diluted earnings per share	$ 3,915,000	$ 2,806,000	$ 11,551,000	$ 7,790,000
Weighted average common shares outstanding	5,881,681	5,935,383	5,881,974	5,947,476
Dilutive potential common shares [Abstract]
Assumed conversion of stock options	0	2,151	0	2,864
Restricted stock awarded	9,892	9,329	9,892	9,329
Assumed conversion of preferred stock	2,494,569	0	2,494,642	0
Dilutive potential common shares	2,504,461	11,480	2,504,534	12,193
Diluted weighted average common shares outstanding	8,386,142	5,946,863	8,386,508	5,959,669
Diluted net income per common share available to common stockholders	$ 0.47	$ 0.47	$ 1.38	$ 1.31
Stock options to purchase shares of common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	128,750	130,500	128,750	130,500
Average dilutive potential common shares associated with convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share (in shares)	0	2,494,801	0	2,494,801