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Earnings Per Share (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Earnings per common share
Income available common shareholders	$ 1,752,675	$ 1,267,447	$ 3,813,133	$ 2,062,131
Weighted average common shares outstanding	6,972	7,191	6,963	7,184
Weighted average common shares outstanding - assuming dilution	7,253	7,337	7,216	7,307
Earnings per common share	$ 0.25	$ 0.18	$ 0.55	$ 0.29
Earnings per common share - assuming dilution	$ 0.24	$ 0.17	$ 0.53	$ 0.28
Restricted stock [Member]
Earnings per common share
Effect of dilutive securities	77	78	87	85
Stock options [Member]
Earnings per common share
Effect of dilutive securities	186	68	166	38

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- Definition

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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