Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities:
Net income	$ 339,918	$ 335,665
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	25,404	17,846
Deferred tax expense (benefit)	(1,625)	39,198
Accretion of loan discounts	(11,364)	(10,470)
Securities premium amortization (discount accretion), net	84,963	73,748
Net (gain) loss on securities transactions	(265)	113
Depreciation and amortization	39,182	37,452
Net (gain) loss on sale/write-down of assets/foreclosed assets	(6,016)	(6,122)
Stock-based compensation	10,693	9,556
Net tax benefit from stock-based compensation	1,602	3,378
Earnings on life insurance policies	(2,744)	(2,510)
Net change in:
Trading account securities	(3,132)	(1,094)
Lease right-of-use assets	14,618	0
Accrued interest receivable and other assets	37,608	(19,047)
Accrued interest payable and other liabilities	56,354	(17,545)
Net cash from operating activities	585,196	460,168
Investing Activities:
Securities held-to-maturity - Purchases	0	(1,500)
Securities held to maturity: Maturities, calls and principal repayments	69,273	300,340
Securities available for sale:
Purchases	(9,815,936)	(14,983,642)
Sales	8,236,066	13,838,566
Maturities, calls and principal repayments	1,007,783	182,028
Proceeds from sale of loans	24,036	21,318
Net change in loans	(569,223)	(718,551)
Benefits received on life insurance policies	0	384
Proceeds from sales of premises and equipment	8,019	12,859
Purchases of premises and equipment	(168,326)	(56,781)
Proceeds from sales of repossessed properties	131	1,106
Net cash from investing activities	(1,208,177)	(1,403,873)
Financing Activities:
Net change in deposits	(65,622)	(523,535)
Net change in short-term borrowings	(166,893)	(64,047)
Proceeds from stock option exercises	13,506	26,567
Purchase of treasury stock	(67,709)	(70)
Cash dividends paid on preferred stock	(6,047)	(6,047)
Cash dividends paid on common stock	(132,132)	(122,721)
Net cash from financing activities	(424,897)	(689,853)
Net change in cash and cash equivalents	(1,047,878)	(1,633,558)
Cash and equivalents at beginning of period	3,955,779	5,053,047
Cash and equivalents at end of period	$ 2,907,901	$ 3,419,489