CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows From Operating Activities
Net income	$ 52,108	$ 46,508
Adjustments to net income:
Provision for losses on covered loans	9,892	7,466
Amortization of intangibles	1,932	1,886
Depreciation and amortization	8,172	7,428
Share-based employee compensation expense	5,091	4,706
Deferred income tax (benefit) expense	(598)	297
Gain on disposal of assets	(1,114)	(2,191)
Gain on sale of securities	(1,046)	(449)
Other, net	1,472	(2,430)
Net change in:
Trading securities	61,692	(20,559)
Other assets and other liabilities, net	(25,394)	(41,395)
Net cash provided by operating activities	112,207	1,267
Cash Flows From Investing Activities
Purchase of securities available-for-sale	(293,985)	(629,049)
Sales of securities available-for-sale	1,034,250	5,173
Maturities and paydowns of securities available-for-sale	695,518	1,362,442
Purchase of securities held-to-maturity	(9,965)	(530,159)
Maturities and paydowns of securities held-to-maturity	6,736	1,005
Loan originations, net of principal collections	(313,834)	(346,887)
Net payments for premises and equipment	(11,128)	(7,025)
Net cash paid in acquisitions		(850)
Other investing activities, net	23,927	20,592
Net cash provided by (used in) investing activities	1,131,519	(124,758)
Cash Flows From Financing Activities
Net (decrease) increase in deposits	(564,769)	400,155
Net decrease in federal funds purchased and securities sold under repurchase agreements	(510,600)	(40,000)
Net increase in short-term borrowings	100,000
Issuance of long-term debt	5,603
Repayment of long-term debt	(214,081)	(1,500)
Proceeds from exercise of stock options	11,835	2,000
Tax benefit from exercise of stock options	2,627	770
Cash dividends paid	(2,406)	(13,302)
Other financing activities, net	(404)	(1,272)
Net cash (used in) provided by financing activities	(1,172,195)	346,851
Net increase in cash and cash equivalents	71,531	223,360
Cash and cash equivalents at beginning of year	415,405	244,814
Cash and cash equivalents at end of period	486,936	468,174
Cash paid during the period for:
Interest	26,960	22,386
Income taxes	9,261	27,163
Non-cash investing activities:
Transfer of loans to other real estate owned	9,675	8,292
Transfer of SERP liability to equity		$ 8,348