Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income	$ 35,495	$ 61,760
Unrealized gains on securities:
Change in unrealized securities gains arising during period	(2,898)	(9,139)
Deferred tax benefit (expense)	1,123	3,447
Reclassification adjustment for losses (gains) included in income before income taxes	0	449
Deferred tax expense (benefit)	0	(177)
Total change in unrealized gains on securities, net of tax	(1,775)	(5,420)
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	1,138	3,175
Deferred tax benefit (expense)	(450)	(1,254)
Reclassification adjustment for gains (losses) included in income before income taxes	(749)	(1,458)
Deferred tax expense (benefit)	296	576
Total change in unrecognized loss on cash flow hedges, net of tax	235	1,039
Change in pension obligation:
Change in pension obligation	2,790	1,648
Deferred tax benefit (expense)	(1,092)	(645)
Total change in pension obligation, net of tax	1,698	1,003
Other comprehensive income (loss)	158	(3,378)
Total comprehensive income	$ 35,653	$ 58,382