Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Cash Flows From Operating Activities:
Net income	$ 136,461	$ 125,900
Adjustments to reconcile net income before non-controlling interest to net cash provided by operating activities:
Provision for credit losses	8,950	78,140
Change in fair value of mortgage servicing rights	10,364	5,526
Unrealized (gains) losses from derivatives	5,834	(18,542)
Tax benefit on exercise of stock options	(339)	(335)
Change in bank-owned life insurance	(5,735)	(5,880)
Stock-based compensation	4,803	4,359
Depreciation and amortization	24,529	30,843
Net amortization of securities discounts and premiums	48,751	44,240
Net realized (gains) losses on financial instruments and other assets	(16,789)	4,863
Mortgage loans originated for resale	(902,774)	(818,282)
Proceeds from sale of mortgage loans held for resale	1,013,516	817,960
Capitalized mortgage servicing rights	(10,767)	(10,362)
Change in trading securities, including mortgage trading securities	(169,581)	(250,268)
Change in receivables	18,996	(17,327)
Change in other assets	17,073	15,199
Change in accrued interest, taxes and expense	(29,614)	(19,978)
Change in other liabilities	(35,125)	29,590
Net cash provided by operating activities	118,553	15,646
Cash Flows From Investing Activities:
Proceeds from maturities of investment securities	26,986	61,275
Proceeds from maturities of available for sale securities	1,216,168	1,121,309
Purchases of investment securities	(37,085)	(174,255)
Purchases of available for sale securities	(2,967,565)	(2,254,088)
Proceeds from sales of available for sale securities	1,447,073	956,170
Change in amount receivable on unsettled securities transactions	(35,541)	0
Loans originated net of principal collected	(87,541)	302,180
Purchase of mortgage servicing rights	0	(26,658)
Proceeds from derivative asset contracts	55,877	114,312
Proceeds from disposition of assets	62,060	13,154
Purchases of assets	(19,984)	(24,966)
Net cash provided by (used in) investing activities	(339,552)	88,433
Cash Flows From Financing Activities:
Net change in demand deposits, transaction deposits and savings accounts	281,284	664,177
Net change in time deposits	125,692	(94,090)
Net change in other borrowings	(214,296)	(634,330)
Net payments or proceeds on derivative liability contracts	(58,891)	(105,856)
Net change in derivative margin accounts	(46,606)	(26,889)
Change in amount due on unsettled security transactions	6,182	54,135
Issuance of common and treasury stock, net	4,291	2,887
Tax benefit on exercise of stock options	339	335
Dividends paid	(35,639)	(33,138)
Net cash provided by (used in) financing activities	62,356	(172,769)
Net decrease in cash and cash equivalents	(158,643)	(68,690)
Cash and cash equivalents at beginning of period	1,269,404	921,216
Cash and cash equivalents at end of period	1,110,761	852,526
Cash paid for interest	63,563	74,563
Cash paid for taxes	87,888	71,262
Net loans transferred to repossessed real estate and other assets	33,894	24,769
Increase in U.S. government guaranteed loans elgible for repurchase	59,697	0
Accrued purchase of mortgage servicing rights	$ 0	$ 5,234

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The net cash inflow or outflow from investing activity.

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The increase during the reporting period in the cumulative value of servicing rights. This increase is the result of new servicing rights that are created when mortgages are sold or transferred.

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The cash outflow from purchases of available-for-sale securities and held-to-maturity securities.

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The cash outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.

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Value of real estate transferred in noncash transactions during the reporting period.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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