Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net income	$ 140,473	$ 112,602
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	(39,531)	78,005
Deferred tax expense (benefit)	(18,000)	5,999
Change in current taxes payable	(37,737)	23,051
Depreciation	52,212	50,685
Change in accrued interest payable	(3,302)	(12,574)
Change in income earned not collected	1,556	(9,349)
Gain on sale of other assets	(4,085)	0
Securities losses (gains)	0	11
Origination of loans held for sale	(323,665)	(415,527)
Proceeds from sale of loans held for sale	376,395	433,489
Gain on sale of loans	(9,451)	(4,033)
Loss on sale of other real estate	4,574	31,070
Net amortization of premiums and discounts	(96,091)	(90,461)
FDIC receivable for loss share agreements	58,802	(15,240)
Net change in other assets	107,757	26,617
Net change in other liabilities	56,440	5,316
Net cash provided by operating activities	266,347	219,661
INVESTING ACTIVITIES
Net change in loans outstanding	364,916	592,015
Purchases of investment securities available for sale	(1,940,198)	(4,241,879)
Proceeds from maturities of investment securities held to maturity	329	363
Proceeds from maturities of investment securities available for sale	1,951,735	3,293,188
Proceeds from sales of investment securities available for sale	0	56
Net change in overnight investments	(910,951)	(253,221)
Cash received from the FDIC for loss share agreements	45,103	223,863
Proceeds from sale of other real estate	120,712	114,357
Additions to premises and equipment	(38,887)	(73,616)
Net cash (used) provided by investing activities	(407,241)	(344,874)
FINANCING ACTIVITIES
Net change in time deposits	(529,675)	(756,798)
Net change in demand and other interest-bearing deposits	506,969	1,072,739
Net change in short-term borrowings	35,930	62,551
Repayment of long-term obligations	(3,958)	(223,779)
Origination of long-term obligations	70,000	0
Repurchase of common stock	(321)	(4,949)
Cash dividends paid	(8,663)	(9,245)
Net cash provided (used) by financing activities	70,282	140,519
Change in cash and due from banks	(70,612)	15,306
Cash and due from banks at beginning of period	639,730	590,801
Cash and due from banks at end of period	569,118	606,107
CASH PAYMENTS FOR:
Interest	46,873	84,779
Income taxes	99,398	35,208
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized securities gains (losses)	(36,998)	16,342
Change in fair value of cash flow hedge	2,489	(456)
Change in pension obligation	12,896	8,368
Transfers of loans to other real estate	78,303	117,363
Reclassification	$ 7,368	$ 0