Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities:
Net income	$ 220,542	$ 221,090
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	42,734	17,845
Deferred tax expense (benefit)	(11,629)	(12,234)
Accretion of loan discount	(11,893)	(10,545)
Securities premium amortization (discount accretion), net	59,071	54,346
Net (gain) loss on securities transactions	(14,866)	(176)
Depreciation and amortization	35,712	30,931
Net (gain) loss on sale/write-down of assets/foreclosed assets	(373)	(786)
Stock-based compensation	7,998	7,679
Net excess tax benefit from stock-based compensation	1,610	880
Earnings on life insurance policies	(2,678)	(2,689)
Net change in:
Trading account securities	418	(818)
Accrued interest receivable and other assets	11,134	42,297
Accrued interest payable and other liabilities	(2,806)	10,939
Net cash from operating activities	334,974	358,759
Investing Activities:
Securities held-to-maturity - Purchases	0	0
Securities held-to-maturity - Sales	135,610	0
Securities held to maturity: Maturities, calls and principal repayments	227,760	207,548
Securities available for sale:
Purchases	(10,079,302)	(5,843,502)
Sales	9,040,245	4,721,189
Maturities, calls and principal repayments	270,737	580,765
Proceeds from sale of loans	30,470	0
Net change in loans	(142,698)	(368,690)
Benefits received on life insurance policies	906	225
Proceeds from sales of premises and equipment	1,517	74
Purchases of premises and equipment	(32,647)	(119,049)
Proceeds from sales of repossessed properties	297	4,117
Net cash from investing activities	(547,105)	(817,323)
Financing Activities:
Net change in deposits	763,953	188,467
Net change in short-term borrowings	(89,220)	(170,940)
Proceeds from stock option exercises	47,873	11,830
Purchase of treasury stock	0	(74,947)
Cash dividends – preferred stock	(6,047)	(6,047)
Cash dividends – common stock	(100,563)	(99,017)
Net cash from financing activities	615,996	(150,654)
Net change in cash and cash equivalents	403,865	(609,218)
Cash and equivalents at beginning of period	3,591,523	4,364,123
Cash and equivalents at end of period	$ 3,995,388	$ 3,754,905