Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash Flows From Operating Activities:
Net income	$ 83,193	$ 64,766
Adjustments to reconcile net income before non-controlling interest to net cash provided by operating activities:
Provision for credit losses	0	6,250
Change in fair value of mortgage servicing rights	(7,127)	(3,129)
Unrealized (gains) losses from derivatives	(4,874)	7,694
Tax benefit on exercise of stock options	428	(545)
Change in bank-owned life insurance	(2,871)	(2,863)
Stock-based compensation	2,004	2,615
Depreciation and amortization	12,326	12,369
Net amortization of securities discounts and premiums	23,850	24,098
Net realized gains on financial instruments and other assets	(18,313)	(9,722)
Mortgage loans originated for sale	(747,435)	(418,754)
Proceeds from sale of mortgage loans held for sale	711,602	562,576
Capitalized mortgage servicing rights	(8,372)	(4,969)
Change in trading and fair value option securities	250,562	76,145
Change in receivables	(18,487)	35,880
Change in other assets	(1,720)	9,391
Change in accrued interest, taxes and expense	31,332	1,379
Change in other liabilities	10,787	(4,838)
Net cash provided by operating activities	316,885	358,343
Cash Flows From Investing Activities:
Proceeds from maturities of investment securities	12,083	3,610
Proceeds from maturities or redemptions of available for sale securities	1,374,819	738,921
Purchases of investment securities	(146)	(7,495)
Purchases of available for sale securities	(2,346,849)	(1,939,500)
Proceeds from sales of available for sale securities	991,941	793,152
Change in amount receivable on unsettled securities transactions	(436,137)	(107,769)
Loans originated net of principal collected	(319,043)	21,873
Net payments on derivative asset contracts	(116,683)	(65,861)
Proceeds from disposition of assets	38,761	15,233
Purchases of assets	(31,799)	(7,443)
Net cash used in investing activities	(833,053)	(555,279)
Cash Flows From Financing Activities:
Net change in demand deposits, transaction deposits and savings accounts	(23,410)	525,422
Net change in time deposits	(215,883)	168,603
Net change in other borrowings	762,665	(1,607,694)
Net payments or proceeds on derivative liability contracts	110,679	64,182
Net change in derivative margin accounts	(15,630)	(84,614)
Change in amount due on unsettled security transactions	(348,205)	683,479
Issuance of common and treasury stock, net	7,101	2,955
Tax benefit on exercise of stock options	(428)	545
Repurchase of common stock	(18,432)	0
Dividends paid	(22,348)	(16,956)
Net cash provided by (used in) financing activities	236,109	(264,078)
Net decrease in cash and cash equivalents	(280,059)	(461,014)
Cash and cash equivalents at beginning of period	986,365	1,269,404
Cash and cash equivalents at end of period	706,306	808,390
Cash paid for interest	17,817	26,239
Cash paid for taxes	3,765	9,265
Net loans and bank premises transferred to repossessed real estate and other assets	26,041	21,010
Increase in U.S. government guaranteed loans eligible for repurchase	23,184	(8,833)
Increase in receivables from conveyance of other real estate owned guaranteed by U.S. government agencies	$ 18,425	$ 17,419