Accounting Policies (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Basic earnings per share
Net income	$ 5,311	$ 4,613
Less: Preferred stock dividends and accretion of discount	146	156
Net Income Available to Common Shareholders	5,165	4,457
Weighted average common shares outstanding	8,617,466	7,422,860
Basic earnings per share	$ 0.60	$ 0.60
Diluted earnings per share
Net income available to common shareholders	$ 5,165	$ 4,457
Weighted average common shares outstanding	8,617,466	7,422,860
Effect of dilutive securities:
Warrants	293,237	159,657
Weighted average shares outstanding	8,980,655	7,598,490
Diluted earnings per share	$ 0.58	$ 0.59
Restricted stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	35,557	1,457
Stock options [Member]
Effect of dilutive securities:
Effect of dilutive securities	34,395	14,517

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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