Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities:
Net income	$ 145,240	$ 127,892
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	11,035	11,524
Deferred tax expense (benefit)	(7,404)	(4,534)
Accretion Of Loan Discount	(6,951)	(7,370)
Securities premium amortization (discount accretion), net	35,511	28,359
Net (gain) loss on securities transactions	(228)	(2)
Depreciation and amortization	20,175	19,434
Net (gain) loss on sale/write-down of assets/foreclosed assets	(845)	939
Stock-based compensation	5,337	4,696
Net tax benefit (deficiency) from stock-based compensation	(3)	12
Excess tax benefits from stock-based compensation	(753)	(1,652)
Earnings on life insurance policies	(1,814)	(1,413)
Net change in:
Trading account securities	(212)	909
Accrued interest receivable and other assets	(64,974)	(34,943)
Accrued interest payable and other liabilities	(17,811)	(43,639)
Net cash from operating activities	116,303	100,212
Investing Activities:
Securities held to maturity: Purchases	0	0
Securities held to maturity: Maturities, calls and principal repayments	103,580	43,271
Securities available for sale:
Purchases	(931,021)	(3,303,838)
Sales	223,987	2,028
Maturities, calls and principal repayments	471,195	3,270,776
Net change in loans	(410,449)	(490,836)
Net cash (paid) received in acquisitions	0	830,661
Proceeds from sales of premises and equipment	10	28
Purchases of premises and equipment	(96,805)	(44,618)
Proceeds from sales of repossessed properties	3,947	3,410
Net cash from investing activities	(635,556)	310,882
Financing Activities:
Net change in deposits	(294,776)	203,777
Net change in short-term borrowings	(210,755)	(105,451)
Proceeds from stock option exercises	8,950	20,109
Excess tax benefits from stock-based compensation	753	1,652
Payments for repurchase of common stock	(10,594)	0
Cash dividends paid on preferred stock	(4,031)	(4,031)
Cash dividends paid on common stock	(65,871)	(62,660)
Net cash from financing activities	(576,324)	53,396
Net change in cash and cash equivalents	(1,095,577)	464,490
Cash and equivalents at beginning of period	4,364,123	4,556,125
Cash and equivalents at end of period	$ 3,268,546	$ 5,020,615