Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities:
Net income	$ 127,658	$ 114,851
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	11,524	9,575
Deferred tax expense (benefit)	(4,540)	(1,739)
Accretion of loan discounts	(7,033)	(5,790)
Securities premium amortization (discount accretion), net	28,359	18,124
Net (gain) loss on securities transactions	(2)	(11)
Depreciation and amortization	19,457	19,081
Net (gain) loss on sale/write-down of assets/foreclosed assets	939	3,023
Stock-based compensation	4,696	4,985
Net tax benefit (deficiency) from stock-based compensation	12	(448)
Excess tax benefits from stock-based compensation	(1,652)	(375)
Earnings on life insurance policies	(1,414)	(1,699)
Net change in:
Trading account securities	909	13,297
Accrued interest receivable and other assets	(34,937)	(42,461)
Accrued interest payable and other liabilities	(43,764)	(163,670)
Net cash from operating activities	100,212	(33,257)
Investing Activities:
Securities held to maturity: Purchases	0	(221,107)
Securities held to maturity: Maturities, calls and principal repayments	43,271	9,723
Securities available for sale:
Purchases	(3,303,838)	(8,910,706)
Sales	2,028	8,495,587
Maturities, calls and principal repayments	3,270,776	517,698
Net change in loans	(490,836)	(26,446)
Net cash (paid) received in acquisitions	830,656	0
Proceeds from sales of premises and equipment	28	16,301
Purchases of premises and equipment	(44,618)	(18,520)
Proceeds from sales of repossessed properties	3,410	4,081
Net cash from investing activities	310,877	(133,389)
Financing Activities:
Net change in deposits	203,777	(419,147)
Net change in short-term borrowings	(105,451)	(11,238)
Principal payments on long-term borrowings	0	(7)
Proceeds from stock option exercises	20,109	34,189
Excess tax benefits from stock-based compensation	1,652	375
Proceeds from issuance of preferred stock	0	144,486
Purchase of treasury stock	0	(115,200)
Accelerated share repurchase forward contract	0	(28,800)
Cash dividends paid on preferred stock	(4,031)	(2,688)
Cash dividends paid on common stock	(62,660)	(58,948)
Net cash from financing activities	53,396	(456,978)
Net change in cash and cash equivalents	464,485	(623,624)
Cash and equivalents at beginning of period	4,556,125	3,524,979
Cash and equivalents at end of period	$ 5,020,610	$ 2,901,355