Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 18,303	$ 19,029	$ 59,749	$ 59,773
Other comprehensive income, net of tax:
Unrealized net holding gain (loss) on securities available-for-sale, net of income taxes	(2,905)	(11,015)	21,115	(33,931)
Other comprehensive income (loss)	(2,905)	(11,015)	21,115	(33,931)
Comprehensive income	$ 15,398	$ 8,014	$ 80,864	$ 25,842