Consolidated Statements of Comprehensive Income (Unaudited) (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	$ 46,984	$ 30,378	$ 104,783	$ 57,793
Other comprehensive income, net of tax:
Net change from retirement benefits plans	1,097	1,176	3,290	1,329
Unrealized net holding gain on securities, net of reclassifications	4,606	27,477	11,634	33,645
Net unrealized (loss) on derivatives and hedging	(28)	(277)	(201)	(181)
Other comprehensive income	5,675	28,376	14,723	34,793
Comprehensive income	$ 52,659	$ 58,754	$ 119,506	$ 92,586