CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities
Net income	$ 69,498	$ 64,242	$ 191,919	$ 176,554
Adjustments to net income:
(Reversal of) provision for credit losses on loans and leases, excluding covered loans	(8,000)		(9,000)
Provision for losses on covered loans	589	2,496	3,783	461
Amortization of intangibles	1,426	1,932	4,367	5,795
Depreciation and amortization	8,276	7,827	23,989	24,248
Share-based employee compensation expense			16,116	16,283
Deferred income tax benefit			(3,758)	(1,888)
Gain on disposal of assets	(2,985)	(3,092)	(12,649)	(5,155)
Gain on sale of securities	(14)	(5,788)	(7,503)	(12,624)
Impairment loss on securities	75	144	323	326
Other, net			21,706	24,759
Net change in:
Trading securities			(43,608)	64,772
Other assets and other liabilities, net			(44,477)	81,814
Net cash provided by operating activities			141,208	375,345
Cash Flows From Investing Activities
Purchase of securities available-for-sale			(1,537,655)	(1,775,702)
Sales of securities available-for-sale	1,000	584,700	627,102	1,835,775
Maturities and paydowns of securities available-for-sale			1,527,117	2,064,288
Purchase of securities held-to-maturity			(615,295)	(277,199)
Maturities and paydowns of securities held-to-maturity			119,727	23,826
Loan originations, net of principal collections			(1,970,596)	(1,436,714)
Net payments for premises and equipment			(34,446)	(43,415)
Proceeds from sale of business			7,053
Other investing activities, net			13,976	48,429
Net cash (used in) provided by investing activities			(1,863,017)	439,288
Cash Flows From Financing Activities
Net increase in deposits			2,276,543	1,734,514
Net decrease in federal funds purchased				(1,214,200)
Issuance of long-term debt			31,759	35,289
Repayment of long-term debt			(135,473)	(231,382)
Proceeds from exercise of stock options			21,734	24,963
Tax benefit from exercise of stock options			4,022	3,749
Cash dividends paid			(66,624)	(34,355)
Other financing activities, net			(17,268)	(1,902)
Net cash provided by financing activities			2,114,693	316,676
Net increase in cash and cash equivalents			392,884	1,131,309
Cash and cash equivalents at beginning of year			935,946	415,405
Cash and cash equivalents at end of period	1,328,830	1,546,714	1,328,830	1,546,714
Cash paid during the period for:
Interest			48,019	56,100
Income taxes			102,757	11,478
Non-cash investing activities:
Transfer of loans to other real estate owned			$ 11,364	$ 18,637