Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities:
Net income	$ 270,508	$ 221,920
Adjustments to reconcile net income before non-controlling interest to net cash provided by operating activities:
Provision for credit losses	(8,000)	8,950
Change in fair value of mortgage servicing rights	13,899	35,186
Unrealized gains from derivatives	(2,665)	(3,898)
Tax benefit on exercise of stock options	487	(494)
Change in bank-owned life insurance	(8,416)	(8,496)
Stock-based compensation	6,334	7,131
Depreciation and amortization	37,452	36,877
Net amortization of securities discounts and premiums	68,579	76,839
Net realized gains on financial instruments and other assets	(104,893)	(6,992)
Mortgage loans originated for resale	(2,634,809)	(1,540,735)
Proceeds from sale of mortgage loans held for resale	2,590,960	1,555,075
Capitalized mortgage servicing rights	(29,754)	(17,966)
Change in trading and fair value option securities	189,182	(298,334)
Change in receivables	7,328	37,513
Change in other assets	(5,747)	33,880
Change in accrued interest, taxes and expense	29,220	69,507
Change in other liabilities	28,980	(53,478)
Net cash provided by operating activities	448,645	152,485
Cash Flows From Investing Activities:
Proceeds from maturities of investment securities	67,571	54,639
Proceeds from maturities of available for sale securities	3,444,670	2,698,067
Purchases of investment securities	(60,542)	(37,085)
Purchases of available for sale securities	(6,412,356)	(5,238,649)
Proceeds from sales of available for sale securities	1,660,876	2,058,661
Change in amount receivable on unsettled securities transactions	42,671	(37,582)
Loans originated net of principal collected	(594,261)	(457,430)
Net proceeds from (payments on) derivative asset contracts	(108,296)	(45,449)
Acquisitions, net of cash acquired	(28,671)	0
Proceeds from disposition of assets	135,760	91,410
Purchases of assets	(77,032)	(52,857)
Net cash used in investing activities	(1,929,610)	(966,275)
Cash Flows From Financing Activities:
Net change in demand deposits, transaction deposits and savings accounts	739,943	1,214,659
Net change in time deposits	(359,656)	45,462
Net change in other borrowings	974,189	(670,791)
Repayment of subordinated debt	(53,787)	0
Net payments or proceeds on derivative liability contracts	90,646	42,849
Net change in derivative margin accounts	(101,683)	(101,705)
Change in amount due on unsettled security transactions	(96,373)	57,672
Issuance of common and treasury stock, net	11,526	5,681
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	(487)	494
Repurchase of common stock	(20,558)	(22,866)
Dividends paid	(73,666)	(54,188)
Net cash provided by (used in) financing activities	1,110,094	517,267
Net decrease in cash and cash equivalents	(370,871)	(296,523)
Cash and cash equivalents at beginning of period	986,365	1,269,404
Cash and cash equivalents at end of period	615,494	972,881
Cash paid for interest	66,819	87,638
Cash paid for taxes	113,663	115,518
Net loans and bank premises transferred to repossessed real estate and other assets	97,142	57,651
Increase in U.S. government guaranteed loans eligible for repurchase	84,520	110,744
Increase in receivables from conveyance of other real estate owned guaranteed by US govt	$ 65,344	$ 0