Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic Net Income per Common Share Available to Common Stockholders [Abstract]
Net income	$ 4,029,000	$ 3,665,000	$ 7,636,000	$ 7,193,000
Preferred stock dividends	(1,104,000)	(1,105,000)	(2,208,000)	(2,209,000)
Net income available to common stockholders	2,925,000	2,560,000	5,428,000	4,984,000
Weighted average common shares outstanding	5,880,919	5,951,981	5,882,123	5,953,623
Basic earnings per common share	$ 0.49	$ 0.43	$ 0.92	$ 0.84
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]
Net income available to common stockholders	2,925,000	2,560,000	5,428,000	4,984,000
Effect of assumed preferred stock conversion	1,104,000		2,208,000	0
Net income applicable to diluted earnings per share	$ 4,029,000	$ 2,560,000	$ 7,636,000	$ 4,984,000
Weighted average common shares outstanding	5,880,919	5,951,981	5,882,123	5,953,623
Dilutive potential common shares [Abstract]
Assumed conversion of stock options	0	1,118	0	1,124
Restricted stock awarded	9,501	9,027	9,051	9,027
Assumed conversion of preferred stock	2,494,569	0	2,494,679	0
Dilutive potential common shares	2,504,070	10,145	2,503,730	10,151
Diluted weighted average common shares outstanding	8,384,989	5,962,126	8,386,303	5,963,774
Diluted net income per common share available to common stockholders	$ 0.48	$ 0.43	$ 0.91	$ 0.84
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	104,750	128,750	104,750
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