CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities
Net income	$ 232,516	$ 209,133	$ 176,055
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans		10,000	12,500
Provision for losses on covered loans	635	45,346	43,646
Amortization of intangibles	7,517	7,268	7,727
Depreciation and amortization	32,267	32,485	27,596
Share-based employee compensation expense	22,765	18,563	19,454
Deferred income tax (benefit) expense	(20,187)	12,309	(34,938)
Gain on disposal of assets	(9,026)	(11,293)	(20,300)
Gain on sale of securities	(7,975)	(1,113)	(5,066)
Gain on acquisition			(8,164)
Impairment loss on securities	326	291	651
Other, net	31,505	(28,632)	(11,459)
Net change in:
Trading securities	33,866	(52,134)	193,026
Other assets and other liabilities, net	96,375	20,130	207,293
Net cash provided by operating activities	420,584	262,353	608,021
Cash Flows From Investing Activities
Purchase of securities available-for-sale	(3,371,639)	(5,362,435)	(5,288,118)
Sales of securities available-for-sale	2,371,399	52,085	101,089
Maturities and paydowns of securities available-for-sale	2,763,884	3,659,370	3,379,320
Purchase of securities held-to-maturity	(617,286)	(958,871)	(467,817)
Maturities and paydowns of securities held-to-maturity	49,132	25,863	91
Loan originations, net of principal collections	(1,961,074)	(1,746,581)	(547,887)
Net payments for premises and equipment	(81,232)	(33,571)	(42,711)
Net cash (paid) acquired in acquisitions		(123,746)	28,066
Other investing activities, net	71,747	97,765	122,649
Net cash used in investing activities	(775,069)	(4,390,121)	(2,715,318)
Cash Flows From Financing Activities
Net increase in deposits	2,177,082	3,114,773	2,083,925
Net (decrease) increase in federal funds purchased	(1,214,200)	1,164,200	50,000
Net decrease in other short-term borrowings			(3,785)
Issuance of long-term debt	62,403	168,366
Repayment of long-term debt	(240,511)	(260,767)	(148,507)
Proceeds from exercise of stock options	40,466	22,428	5,089
Tax benefit from exercise of stock options	4,718	3,089	2,007
Issuance of preferred stock	97,696	169,920
Cash dividends paid	(50,375)	(80,380)	(42,489)
Other financing activities, net	(2,253)	(3,270)	(28,818)
Net cash provided by financing activities	875,026	4,298,359	1,917,422
Net increase (decrease) in cash and cash equivalents	520,541	170,591	(189,875)
Cash and cash equivalents at beginning of year	415,405	244,814	434,689
Cash and cash equivalents at end of period	935,946	415,405	244,814
Cash paid during the period for:
Interest	60,511	51,966	73,460
Income taxes	60,668	108,833	114,990
Non-cash investing activities:
Transfer of loans to other real estate owned	26,276	64,554	113,563
Transfer of securities from available-for-sale to held-to-maturity	994,329
Transfer of SERP liability to equity		8,348
Assets acquired (liabilities assumed) in acquisitions:
Securities available-for-sale			10,441
Loans and leases		318,301	1,060
Covered loans			55,313
Covered other real estate owned			7,463
Deposits			(126,795)
Other borrowings		$ (320,856)	$ (3,165)