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Condensed Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]    
Net income $ 5,450 $ 4,337
Other comprehensive income, net of tax:    
Unrealized gain (loss) on available-for-sale securities, net of tax of $41 for the three months ended March 31, 2012 (61) 26
Other comprehensive income (61) 26
Comprehensive income 5,389 4,363
Preferred stockholder dividends   (704)
Allocation of comprehensive income to preferred stockholders (63) (659)
Comprehensive income attributable to common stockholders $ 5,326 $ 3,000