CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cash Flows From Operating Activities
Net income	$ 67,211	$ 60,204	$ 122,421	$ 112,312
Adjustments to net income:
(Reversal of) provision for credit losses on loans and leases, excluding covered loans	(1,000)		(1,000)
(Reversal of) provision for losses on covered loans	(1,461)	(11,927)	3,194	(2,035)
Amortization of intangibles	1,454	1,931	2,941	3,863
Depreciation and amortization	7,885	8,249	15,713	16,421
Share-based employee compensation expense			10,636	10,535
Deferred income tax benefit			(2,934)	(1,514)
Gain on disposal of assets	(6,838)	(949)	(9,664)	(2,063)
Gain on sale of securities	(5,367)	(5,790)	(7,489)	(6,836)
Impairment loss on securities	248	182	248	182
Other, net			14,926	23,488
Net change in:
Trading securities			(3,802)	67,568
Other assets and other liabilities, net			(22,414)	45,924
Net cash provided by operating activities			122,776	267,845
Cash Flows From Investing Activities
Purchase of securities available-for-sale			(820,540)	(698,457)
Sales of securities available-for-sale	15,000	200	626,055	1,251,056
Maturities and paydowns of securities available-for-sale			1,133,677	1,454,644
Purchase of securities held-to-maturity			(537,894)	(123,549)
Maturities and paydowns of securities held-to-maturity			75,409	16,336
Loan originations, net of principal collections			(1,171,116)	(813,453)
Net payments for premises and equipment			(22,614)	(29,523)
Other investing activities, net			19,224	31,527
Net cash (used in) provided by investing activities			(697,799)	1,088,581
Cash Flows From Financing Activities
Net increase in deposits			972,088	149,402
Net increase (decrease) in federal funds purchased			50,000	(1,214,200)
Issuance of long-term debt			18,070	16,456
Repayment of long-term debt			(19,765)	(221,899)
Proceeds from exercise of stock options			16,387	17,838
Tax benefit from exercise of stock options			3,240	3,383
Cash dividends paid			(44,374)	(18,351)
Other financing activities, net			(16,252)	(1,901)
Net cash provided by (used in) financing activities			979,394	(1,269,272)
Net increase in cash and cash equivalents			404,371	87,154
Cash and cash equivalents at beginning of year			935,946	415,405
Cash and cash equivalents at end of period	1,340,317	502,559	1,340,317	502,559
Cash paid during the period for:
Interest			26,484	32,147
Income taxes			55,461	11,471
Non-cash investing activities:
Transfer of loans to other real estate owned			$ 4,131	$ 14,629