CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 480,037	$ 541,017	$ 398,646
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	100,420	102,903	63,000
Depreciation and amortization	23,535	20,112	19,982
(Accretion of discounts) amortization of premiums, net	(1,337)	3,642	(4,109)
Amortization of core deposit intangibles	26,066	31,266	22,812
Net gain on sale of securities	(36,608)	(22,430)	(338)
Net gain on sale of loans	(80,304)	(137,361)	(10,470)
Gain on business disposition	(9,823)
Gain on business acquisitions		(2,883)	(139,607)
Stock plan-related compensation	16,735	15,764	13,252
OTTI loss on securities recognized in earnings	18,124	1,971	96,533
Changes in assets and liabilities:
Decrease (increase) in deferred tax asset, net	28,270	36,396	(14,916)
Decrease (increase) in other assets	126,654	59,774	(97,805)
(Decrease) increase in other liabilities	(126,812)	9,214	(89,146)
Origination of loans held for sale	(7,151,083)	(10,864,188)	(888,527)
Proceeds from sale of loans originated for sale	7,416,333	10,135,124	846,120
Net cash provided by (used in) operating activities	830,207	(69,679)	215,427
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from repayment of securities held to maturity	2,799,160	4,117,849	2,469,068
Proceeds from repayment of securities available for sale	221,077	872,548	201,245
Proceeds from sale of securities held to maturity	284,406
Proceeds from sale of securities available for sale	862,755	23,098	10,338
Purchase of securities held to maturity	(2,753,777)	(4,034,384)	(1,808,546)
Purchase of securities available for sale	(1,151,639)
Net (purchase) redemption of Federal Home Loan Bank stock	(44,214)	54,315	14,829
Net (increase) decrease in loans	(1,488,025)	173,459	(1,161,484)
Purchase of premises and equipment, net	(40,746)	(48,641)	(7,385)
Net cash acquired in business transactions	100,027	140,895	4,029,729
Net cash (used in) provided by investing activities	(1,210,976)	1,299,139	3,747,794
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase (decrease) in deposits	465,079	(898,001)	(266,380)
Net increase (decrease) in short-term borrowed funds	1,062,000	500,000	(1,012,900)
Net decrease in long-term borrowed funds	(637,703)	(1,173,074)	(860,783)
Tax effect of stock plans	2,679	2,349	4,010
Cash dividends paid on common stock	(436,914)	(434,366)	(347,554)
Treasury stock purchases	(3,696)	(4,054)	(1,311)
Net cash received from stock option exercises	3,519	5,436	465
Cash used for exercise of FDIC equity appreciation instrument			(23,275)
Proceeds from issuance of common stock, net		28,935	1,012,148
Net cash provided by (used in) financing activities	454,964	(1,972,775)	(1,495,580)
Net increase (decrease) in cash and cash equivalents	74,195	(743,315)	2,467,641
Cash and cash equivalents at beginning of year	1,927,542	2,670,857	203,216
Cash and cash equivalents at end of year	2,001,737	1,927,542	2,670,857
Supplemental information:
Cash paid for interest	686,245	790,233	715,619
Cash paid for income taxes	152,115	307,850	182,767
Non-cash investing and financing activities:
Transfers to other real estate owned from loans	230,677	82,374	14,372
Exchange of debt for common stock			$ 39,153