Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
Net income	$ 99,491	$ 73,078
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan and lease losses	(31,848)	60,382
Deferred tax expense (benefit)	2,360	(6,845)
Change in current taxes payable	(20,649)	26,247
Depreciation	35,545	33,326
Change in accrued interest payable	(145)	(626)
Change in income earned not collected	2,099	(7,527)
Gain on sale of other assets	(4,085)	0
Securities losses (gains)	0	42
Origination of loans held for sale	(223,128)	(275,140)
Proceeds from sale of loans held for sale	254,087	294,163
Gain on sale of loans	(7,123)	(2,858)
Loss on sale of other real estate	1,480	453
Net amortization of premiums and discounts	(74,175)	(57,163)
FDIC receivable for loss share agreements	20,464	(27,084)
Net change in other assets	68,587	56,180
Net change in other liabilities	24,346	4,076
Net cash provided by operating activities	147,306	170,704
INVESTING ACTIVITIES
Net change in loans outstanding	325,057	468,503
Purchases of investment securities available for sale	(1,375,766)	(2,914,481)
Proceeds from maturities of investment securities held to maturity	212	244
Proceeds from maturities of investment securities available for sale	1,365,287	2,328,204
Proceeds from sales of investment securities available for sale	0	56
Net change in overnight investments	(596,745)	(549,561)
Cash received from the FDIC for loss share agreements	46,534	192,098
Proceeds from sale of other real estate	80,010	78,820
Additions to premises and equipment	(26,696)	(49,253)
Net cash (used) provided by investing activities	(182,107)	(445,370)
FINANCING ACTIVITIES
Net change in time deposits	(390,329)	(528,819)
Net change in demand and other interest-bearing deposits	322,319	753,191
Net change in short-term borrowings	13,432	85,077
Repayment of long-term obligations	(1,608)	(45,997)
Repurchase of common stock	(321)	(2,414)
Cash dividends paid	(5,777)	(6,169)
Net cash provided (used) by financing activities	(62,284)	254,869
Change in cash and due from banks	(97,085)	(19,797)
Cash and due from banks at beginning of period	639,730	590,801
Cash and due from banks at end of period	542,645	571,004
CASH PAYMENTS FOR:
Interest	30,265	51,513
Income taxes	75,917	21,453
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Change in unrealized securities gains (losses)	(40,468)	1,590
Change in fair value of cash flow hedge	2,202	(306)
Change in pension obligation	8,598	5,580
Transfers of loans to other real estate	57,175	80,413
Reclassification	$ 7,368	$ 0