Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities:
Net income	$ 354,200	$ 355,392
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for loan losses	(18,387)	33,587
Depreciation and amortization	20,656	21,057
Amortization of discounts and premiums, net	(6,094)	(2,098)
Amortization of core deposit intangibles	6,424	12,719
Net gain on sales of securities	(5,317)	(17,764)
Gain on sale of loans	(15,308)	(48,809)
Gain on Visa shares sold	(3,856)
Stock plan-related compensation	20,720	16,626
Deferred tax expense	4,281	32,430
Changes in assets and liabilities:
Decrease (increase) in other assets	90,509	(20,473)
Increase in other liabilities	4,771	15,630
Origination of loans held for sale	(2,214,983)	(5,510,041)
Proceeds from sale of loans originated for sale	2,256,216	6,440,377
Net cash provided by operating activities	493,832	1,328,633
Cash Flows from Investing Activities:
Proceeds from repayment of securities held to maturity	558,888	617,351
Proceeds from repayment of securities available for sale	8,277	54,709
Proceeds from sale of securities held to maturity		191,142
Proceeds from sale of securities available for sale	254,491	593,551
Purchase of securities held to maturity	(150,338)	(3,075,597)
Purchase of securities available for sale	(216,000)	(535,347)
Proceeds from sale of Visa shares	3,856
Net redemption (purchase) of Federal Home Loan Bank stock	40,945	(83,685)
Net increase in loans	(2,531,383)	(1,476,755)
Purchase of premises and equipment, net	(47,930)	(21,378)
Net cash used in investing activities	(2,079,194)	(3,736,009)
Cash Flows from Financing Activities:
Net increase in deposits	2,646,779	431,829
Net (decrease) increase in short-term borrowed funds	(703,100)	1,925,000
Net decrease in long-term borrowed funds	(4,990)	(789,749)
Tax effect of stock plans	2,569	797
Cash dividends paid on common stock	(331,627)	(330,172)
Treasury stock purchases	(6,343)	(4,352)
Net cash received from stock option exercises	61	327
Net cash provided by financing activities	1,603,349	1,233,680
Net increase (decrease) in cash and cash equivalents	17,987	(1,173,696)
Cash and cash equivalents at beginning of period	644,550	2,427,258
Cash and cash equivalents at end of period	662,537	1,253,562
Supplemental information:
Cash paid for interest	413,102	415,399
Cash paid for income taxes	176,654	118,322
Non-cash investing and financing activities:
Transfers to other real estate owned from loans	107,936	96,729
Transfer of loans from held for investment to held for sale	$ 398,715