CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net income	$ 241,192	$ 249,465
Adjustments to reconcile net income to net cash provided by operating activities:
Provisions for loan losses	19,120	48,448
Depreciation and amortization	13,919	12,139
Accretion of premiums and discounts, net	(1,071)	(742)
Amortization of core deposit intangibles	8,602	10,079
Net gain on sale of securities	(16,745)	(859)
Net gain on sale of loans	(42,973)	(92,976)
Stock plan-related compensation	10,963	10,375
Deferred tax expense	7,905	13,512
Changes in operating assets and liabilities:
(Increase) decrease in other assets	(66,401)	51,779
Increase in other liabilities	41,363	71,671
Origination of loans held for sale	(4,426,828)	(5,094,278)
Proceeds from sale of loans originated for sale	4,869,711	5,117,092
Net cash provided by operating activities	658,757	395,705
Cash Flows from Investing Activities:
Proceeds from repayment of securities held to maturity	506,277	1,378,707
Proceeds from repayment of securities available for sale	50,875	370,667
Proceeds from sale of securities held to maturity	191,142
Proceeds from sale of securities available for sale	414,186	330,859
Purchase of securities held to maturity	(1,814,586)	(1,415,389)
Purchase of securities available for sale	(357,000)	(379,890)
Net (purchase) redemption of Federal Home Loan Bank stock	(13,028)	65,959
Net increase in loans	(477,389)	(704,639)
Purchase of premises and equipment, net	(15,091)	(11,955)
Net cash used in investing activities	(1,514,614)	(365,681)
Cash Flows from Financing Activities:
Net increase in deposits	410,341	2,722,519
Net increase (decrease) in short-term borrowed funds	300,000	(1,277,000)
Net decrease in long-term borrowed funds	(738,174)	(94,801)
Tax effect of stock plans	314	(35)
Cash dividends paid on common stock	(220,034)	(219,217)
Treasury stock purchases	(4,197)	(2,554)
Net cash received from stock option exercises	59
Net cash (used in) provided by financing activities	(251,691)	1,128,912
Net (decrease) increase in cash and cash equivalents	(1,107,548)	1,158,936
Cash and cash equivalents at beginning of period	2,427,258	2,001,737
Cash and cash equivalents at end of period	1,319,710	3,160,673
Supplemental information:
Cash paid for interest	275,018	311,632
Cash paid for income taxes	102,718	171,965
Non-cash investing and financing activities:
Transfers to other real estate owned from loans	$ 77,516	$ 59,208