Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES
Net income	$ 112,602	$ 164,481
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	78,005	143,024
Deferred tax expense (benefit)	5,999	(36,243)
Change in current taxes payable	23,051	52,970
Depreciation	50,685	48,883
Change in accrued interest payable	(12,574)	(14,851)
Change in income earned not collected	(9,349)	46,753
Gain on acquisitions	0	(150,417)
Securities losses	11	291
Origination of loans held for sale	(415,527)	(333,860)
Proceeds from sale of loans	433,489	350,855
Gain on sale of loans	(4,033)	(6,240)
Loss on sale of other real estate	1,757	4,410
Net accretion of premiums and discounts	(177,456)	(126,315)
FDIC receivable for loss share agreements	71,755	71,045
Net change in other assets	55,930	125,391
Net change in other liabilities	5,316	696
Net cash provided by operating activities	219,661	340,873
INVESTING ACTIVITIES
Net change in loans outstanding	592,015	310,218
Purchases of investment securities available for sale	(4,241,879)	(2,260,736)
Proceeds from maturities of investment securities held to maturity	363	588
Proceeds from maturities of investment securities available for sale	3,293,188	2,848,385
Proceeds from sales of investment securities available for sale	56	242,023
Net change in overnight investments	(253,221)	(11,612)
Cash received from the FDIC for loss share agreements	223,863	239,800
Proceeds from sale of other real estate	114,357	57,083
Additions to premises and equipment	(73,616)	(53,510)
Net cash received from acquisitions	0	1,150,879
Net cash (used) provided by investing activities	(344,874)	2,523,118
FINANCING ACTIVITIES
Net change in time deposits	(756,798)	(1,517,600)
Net change in demand and other interest-bearing deposits	1,072,739	(665,750)
Net change in short-term borrowings	62,551	(298,278)
Repayment of long-term obligations	(223,779)	(273,175)
Repurchase of common stock	(4,949)	(20,665)
Cash dividends paid	(9,245)	(9,364)
Net cash provided (used) by financing activities	140,519	(2,784,832)
Change in cash and due from banks	15,306	79,159
Cash and due from banks at beginning of period	590,801	460,178
Cash and due from banks at end of period	606,107	539,337
CASH PAYMENTS FOR:
Interest	84,779	129,285
Income taxes	35,208	45,825
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized securities gains	16,342	5,635
Change in fair value of cash flow hedge	(456)	(4,039)
Change in pension obligation	8,368	1,072
Transfers of loans to other real estate	117,363	122,471
Acquisitions:
Assets acquired	0	2,934,464
Liabilities assumed	0	2,784,047
Net assets acquired	$ 0	$ 150,417