Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 39,524	$ 81,421	$ 112,602	$ 164,481
Unrealized gains on securities:
Change in unrealized securities gains arising during period	14,783	(2,753)	16,376	5,344
Deferred tax benefit (expense)	(5,949)	1,064	(6,582)	(2,104)
Reclassification adjustment for losses (gains) included in income before income taxes	(31)	(254)	(34)	291
Deferred tax expense (benefit)	12	122	13	(93)
Total change in unrealized gains on securities, net of tax	8,815	(1,821)	9,773	3,438
Change in fair value of cash flow hedges:
Change in unrecognized loss on cash flow hedges	619	(2,701)	1,838	(78)
Deferred tax benefit (expense)	(244)	1,057	(726)	31
Reclassification adjustment for gains (losses) included in income before income taxes	(769)	(1,030)	(2,294)	(3,961)
Deferred tax benefit (expense)	304	416	906	1,564
Total change in unrecognized loss on cash flow hedges, net of tax	(90)	(2,258)	(276)	(2,444)
Change in pension obligation:
Change in pension obligation	2,788	1,648	8,368	4,944
Deferred tax benefit (expense)	(1,092)	(645)	(3,277)	(1,936)
Total change in pension obligation, net of tax	1,696	1,003	5,091	3,008
Other comprehensive income (loss)	10,421	(3,076)	14,588	4,002
Total comprehensive income	$ 49,945	$ 78,345	$ 127,190	$ 168,483