CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows From Operating Activities
Net income	$ 55,210	$ 52,108
Adjustments to net income:
Provision for losses on covered loans	4,655	9,892
Amortization of intangibles	1,487	1,932
Depreciation and amortization	7,828	8,172
Share-based employee compensation expense	5,397	5,091
Deferred income tax benefit	(2,679)	(598)
Gain on disposal of assets	(2,826)	(1,114)
Gain on sale of securities	(2,122)	(1,046)
Other, net	3,720	1,472
Net change in:
Trading securities	20,678	61,692
Other assets and other liabilities, net	(88,574)	(25,394)
Net cash provided by operating activities	2,774	112,207
Cash Flows From Investing Activities
Purchase of securities available-for-sale	(330,444)	(293,985)
Sales of securities available-for-sale	377,115	1,034,250
Maturities and paydowns of securities available-for-sale	823,410	695,518
Purchase of securities held-to-maturity	(282,679)	(9,965)
Maturities and paydowns of securities held-to-maturity	36,337	6,736
Loan originations, net of principal collections	(523,514)	(313,834)
Net payments for premises and equipment	(8,831)	(11,128)
Other investing activities, net	6,676	23,927
Net cash provided by investing activities	98,070	1,131,519
Cash Flows From Financing Activities
Net increase (decrease) in deposits	52,329	(564,769)
Net decrease in federal funds purchased		(510,600)
Net increase in short-term borrowings		100,000
Issuance of long-term debt	7,907	5,603
Repayment of long-term debt	(10,088)	(214,081)
Proceeds from exercise of stock options	13,207	11,835
Tax benefit from exercise of stock options	2,970	2,627
Cash dividends paid	(22,141)	(2,406)
Other financing activities, net	(16,250)	(404)
Net cash provided by (used in) financing activities	27,934	(1,172,195)
Net increase in cash and cash equivalents	128,778	71,531
Cash and cash equivalents at beginning of year	935,946	415,405
Cash and cash equivalents at end of period	1,064,724	486,936
Cash paid during the period for:
Interest	22,121	26,960
Income taxes	39,399	9,261
Non-cash investing activities:
Transfer of loans to other real estate owned	$ 2,033	$ 9,675