CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities
Net income	$ 71,729	$ 70,738	$ 202,827	$ 191,238
Adjustments to net income:
(Reversal of) provision for credit losses on loans and leases, excluding acquired impaired loans	(6,000)	(8,000)	4,000	(9,000)
Provision for losses on acquired impaired loans	1,148	589	2,736	3,783
Depreciation and amortization	9,478	8,276	33,968	23,989
Amortization of intangibles	1,241	1,426	3,844	4,367
Share-based employee compensation expense			15,943	16,116
Deferred income tax benefit			(7,860)	(3,391)
Gain on disposal of assets	1,264	(2,985)	(384)	(12,649)
Gain on sale of securities	(30)	(14)	(5,331)	(7,503)
Impairment loss on securities		75	337	323
Other, net			27,570	22,063
Net change in:
Trading securities			18,372	(43,608)
Other assets and other liabilities, net			(18,192)	(44,520)
Net cash provided by operating activities			277,830	141,208
Cash Flows From Investing Activities
Purchase of securities available-for-sale			(1,921,396)	(1,537,655)
Sales of securities available-for-sale	700	1,000	401,534	627,102
Maturities and paydowns of securities available-for-sale			2,096,132	1,527,117
Purchase of securities held-to-maturity			(299,383)	(615,295)
Maturities and paydowns of securities held-to-maturity			216,979	119,727
Loan originations, net of principal collections			(2,048,750)	(1,970,596)
Net payments for premises and equipment			(38,297)	(34,446)
Proceeds from sale of business				7,053
Other investing activities, net			(2,216)	13,976
Net cash used in investing activities			(1,595,397)	(1,863,017)
Cash Flows From Financing Activities
Net increase in deposits			3,065,259	2,276,543
Net (decrease) increase in federal funds purchased			(320,000)
Issuance of long-term debt			53,054	31,759
Repayment of long-term debt			(37,946)	(135,473)
Proceeds from exercise of stock options			30,737	21,734
Tax benefit from exercise of stock options			5,769	4,022
Cash dividends paid			(70,650)	(66,624)
Other financing activities, net			(6,911)	(17,268)
Net cash provided by financing activities			2,719,312	2,114,693
Net increase in cash and cash equivalents			1,401,745	392,884
Cash and cash equivalents at beginning of year			656,451	935,946
Cash and cash equivalents at end of period	$ 2,058,196	$ 1,328,830	2,058,196	1,328,830
Cash paid during the period for:
Interest			40,086	48,019
Income taxes			63,200	102,757
Non-cash investing activities:
Transfer of loans to other real estate owned			$ 4,200	$ 11,364