CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Net income	$ 378,263	$ 362,385
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	61,268	67,708
Depreciation and amortization	18,699	17,642
Accretion of premiums and discounts, net	(2,263)	(987)
Amortization of core deposit intangibles	14,934	20,618
Net gain on sale of securities	(1,369)	(35,469)
Net gain on sale of loans	(159,511)	(56,131)
Gain on business disposition		(9,823)
Stock plan-related compensation	15,514	12,096
Loss on OTTI of securities recognized in earnings		18,124
Changes in assets and liabilities:
Decrease in deferred tax asset, net	28,344	51,799
Decrease (increase) in other assets	93,341	(2,985)
Increase (decrease) in other liabilities	112,006	(82,526)
Origination of loans held for sale	(7,971,638)	(4,426,713)
Proceeds from sale of loans originated for sale	7,950,220	4,705,787
Net cash provided by operating activities	537,808	641,525
Cash Flows from Investing Activities:
Proceeds from repayment of securities held to maturity	1,838,793	1,821,919
Proceeds from repayment of securities available for sale	457,808	158,479
Proceeds from sale of securities held to maturity		284,406
Proceeds from sale of securities available for sale	561,369	740,738
Purchase of securities held to maturity	(2,785,758)	(2,609,676)
Purchase of securities available for sale	(656,115)	(748,721)
Net redemption of Federal Home Loan Bank stock	16,599	3,424
Net increase in loans	(969,820)	(1,191,660)
Purchase of premises and equipment, net	(21,344)	(29,491)
Net cash acquired in business transactions		100,027
Net cash used in investing activities	(1,558,468)	(1,470,555)
Cash Flows from Financing Activities:
Net increase in deposits	2,247,493	943,596
Net decrease in short-term borrowed funds	(262,000)
Net decrease in long-term borrowed funds	(97,028)	(121,039)
Tax effect of stock plans	340	2,518
Cash dividends paid on common stock	(328,879)	(327,657)
Treasury stock purchases	(2,713)	(2,769)
Net cash received from stock option exercises		3,519
Net cash provided by financing activities	1,557,213	498,168
Net increase (decrease) in cash and cash equivalents	536,553	(330,862)
Cash and cash equivalents at beginning of period	2,001,737	1,927,542
Cash and cash equivalents at end of period	2,538,290	1,596,680
Supplemental information:
Cash paid for interest	469,664	513,189
Cash paid for income taxes	196,761	106,480
Non-cash investing and financing activities:
Transfers to other real estate owned from loans	$ 77,080	$ 197,114