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Consolidated Condensed Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Statement of Comprehensive Income [Abstract]    
Net Income $ 19,619 $ 20,710
Other comprehensive income, net of tax:    
Unrealized net holding gain (loss) on securities available-for-sale, net of income taxes of $5,891 and $(1,282) for the three months ended March 31, 2014 and 2013 10,941 (2,379)
Other comprehensive income (loss) 10,941 (2,379)
Comprehensive income $ 30,560 $ 18,331