Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 82,607	$ 75,610	$ 71,947
Change in net unrealized (loss) gain on available-for-sale (AFS) securities, net of tax	5,120	5,820	2,109
Accretion of the net unrealized loss on the transfer of AFS securities to held-to-maturity (HTM) securities, net of tax	4	5	90
Change in cash flow hedge derivatives, net of tax	0	0	4,999
Change in defined benefit pension plan, net of tax	(4,114)	(11,927)	529
Comprehensive income, net of tax	$ 83,617	$ 69,508	$ 79,674