Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities:
Net income	$ 84,941	$ 68,816
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	7,952	28,500
Deferred tax expense (benefit)	(4,301)	(4,395)
Accretion of loan discount	(3,913)	(3,727)
Securities premium amortization (discount accretion), net	21,638	19,725
Net (gain) loss on securities transactions	0	(14,903)
Depreciation and amortization	12,121	11,912
Net (gain) loss on sale/write-down of assets/foreclosed assets	(533)	(632)
Stock-based compensation	3,103	2,482
Net excess tax benefit from stock-based compensation	3,515	37
Earnings on life insurance policies	(783)	(867)
Net change in:
Trading account securities	(1,088)	(444)
Accrued interest receivable and other assets	55,705	29,418
Accrued interest payable and other liabilities	(48,702)	(5,792)
Net cash from operating activities	129,655	130,130
Investing Activities:
Securities held-to-maturity - Purchases	0	0
Securities held-to-maturity - Sales	0	135,610
Securities held to maturity: Maturities, calls and principal repayments	599,457	149,507
Securities available for sale:
Purchases	(466,004)	(813,955)
Sales	0	1,060,196
Maturities, calls and principal repayments	107,586	91,993
Proceeds from sale of loans	0	0
Net change in loans	(214,281)	(54,632)
Benefits received on life insurance policies	461	0
Proceeds from sales of premises and equipment	1,544	1,513
Purchases of premises and equipment	(6,311)	(7,366)
Proceeds from sales of repossessed properties	345	57
Net cash from investing activities	22,797	562,923
Financing Activities:
Net change in deposits	330,589	(186,620)
Net change in short-term borrowings	(81,792)	(199,636)
Proceeds from issuance of subordinated notes	98,446	0
Principal payments on subordinated notes	(100,000)	0
Proceeds from stock option exercises	24,747	97
Purchase of treasury stock	(42)	0
Cash dividends – preferred stock	(2,016)	(2,016)
Cash dividends – common stock	(34,656)	(32,938)
Net cash from financing activities	235,276	(421,113)
Net change in cash and cash equivalents	387,728	271,940
Cash and equivalents at beginning of period	4,141,445	3,591,523
Cash and equivalents at end of period	$ 4,529,173	$ 3,863,463