Consolidated Condensed Statements of Comprehensive Income - Scenario, Unspecified [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income	$ 21,039	$ 21,810	$ 40,083	$ 41,387
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on securities available-for-sale, net of income tax (benefit) of $(4,432) and $7,042 for the three months ended June 30, 2015 and 2014, and $(200) and $12,933 for the six months ended June 30, 2015 and 2014, respectively	(8,231)	13,079	(372)	24,020
Other comprehensive income (loss)	(8,231)	13,079	(372)	24,020
Comprehensive income	$ 12,808	$ 34,889	$ 39,711	$ 65,407