CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash Flows From Operating Activities
Net income	$ 55,167	$ 112,312	$ 101,675
Adjustments to net income:
Provision for credit losses on loans and leases, excluding covered loans	1,000		1,000
Provision for losses on covered loans	13,293	(2,035)	20,759
Amortization of intangibles	1,518	3,863	3,404
Depreciation and amortization	8,013	16,421	15,441
Share-based employee compensation expense		10,535	8,968
Deferred income tax (benefit) expense		(1,514)	1,276
Gain on disposal of assets	(3,011)	(2,063)	(5,202)
Gain on sale of securities	279	(6,836)	(170)
Impairment loss on securities	178	182	178
Other, net		23,488	(19,467)
Net change in:
Trading securities		67,568	(851)
Other assets and other liabilities, net		45,924	40,111
Net cash provided by operating activities		267,845	167,122
Cash Flows From Investing Activities
Purchase of securities available-for-sale		(698,457)	(1,331,692)
Sales of securities available-for-sale	5,200	1,251,056	5,189
Maturities and paydowns of securities available-for-sale		1,454,644	2,031,596
Purchase of securities held-to-maturity		(123,549)	(638,006)
Maturities and paydowns of securities held-to-maturity		16,336	4,617
Loan originations, net of principal collections		(813,453)	(671,623)
Net payments for premises and equipment		(29,523)	(14,703)
Net cash paid in acquisitions			(69,987)
Other investing activities, net		31,527	28,527
Net cash provided by (used in) investing activities		1,088,581	(656,082)
Cash Flows From Financing Activities
Net increase in deposits		149,402	721,470
Net (decrease) increase in federal funds purchased		(1,214,200)	60,000
Issuance of long-term debt		16,456	156,829
Repayment of long-term debt		(221,899)	(244,813)
Proceeds from exercise of stock options		17,838	9,044
Tax benefit from exercise of stock options		3,383	1,180
Cash dividends paid		(18,351)	(26,632)
Other financing activities, net		(1,901)	(1,930)
Net cash (used in) provided by financing activities		(1,269,272)	675,148
Net increase in cash and cash equivalents		87,154	186,188
Cash and cash equivalents at beginning of year		415,405	244,814
Cash and cash equivalents at end of period	431,002	502,559	431,002
Cash paid during the period for:
Interest		32,147	25,674
Income taxes		11,471	30,373
Non-cash investing activities:
Transfer of loans to other real estate owned		14,629	41,728
Transfer of SERP liability to equity			8,348
Assets acquired (liabilities assumed) in acquisitions:
Loans and leases	318,301		318,301
Other borrowings	$ (320,856)		$ (320,856)