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	$ 13,620	$ 11,865
Other comprehensive income net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $2,804 and $1,139	5,207	(2,115)
Unrealized gain on securities available for sale for which a portion of an other than temporary impairment has been recognized in income, net of tax of $627 and $39	1,164	72
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $443 and $104	(823)	193
Amortization of items previously recorded in accumulated other comprehensive income, net of tax of $345		640
Reclassification adjustment for losses included in net income, net of tax of $83 and $21	(154)	(39)
Period change	5,394	(1,249)
Comprehensive income	$ 19,014	$ 10,616