Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 1,029,498	$ 859,479	$ 736,161
Other comprehensive income, net of tax and reclassification adjustments:
Net unrealized gains on investment securities	114,825	6,687	134,904
Reclassification to income for amortization of gains on terminated cash flow hedges	(112)	(281)	(281)
Foreign currency translation adjustment	519	(803)
Defined benefit plans liability adjustment	945	(156,824)	(3,846)
Total other comprehensive income	116,177	(151,221)	130,777
Total comprehensive income	$ 1,145,675	$ 708,258	$ 866,938