Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net income	$ 37,583	$ 21,300	$ 73,078	$ 83,060
Unrealized gains on securities:
Change in unrealized securities gains arising during period	4,491	17,236	1,593	8,097
Deferred tax benefit (expense)	(1,756)	(6,615)	(633)	(3,168)
Reclassification adjustment for losses (gains) included in income before income taxes	(3)	96	(3)	545
Deferred tax expense (benefit)	1	(38)	1	(215)
Total change in unrealized gains on securities, net of tax	2,733	10,679	958	5,259
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	81	(552)	1,219	2,623
Deferred tax benefit (expense)	(32)	228	(482)	(1,026)
Reclassification adjustment for gains (losses) included in income before income taxes	(776)	(1,473)	(1,525)	(2,931)
Deferred tax benefit (expense)	306	572	602	1,148
Total change in unrecognized loss on cash flow hedges, net of tax	(421)	(1,225)	(186)	(186)
Change in pension obligation:
Change in pension obligation	2,790	1,648	5,580	3,296
Deferred tax benefit (expense)	(1,093)	(646)	(2,185)	(1,291)
Total change in pension obligation, net of tax	1,697	1,002	3,395	2,005
Other comprehensive income (loss)	4,009	10,456	4,167	7,078
Total comprehensive income	$ 41,592	$ 31,756	$ 77,245	$ 90,138