Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES:
Net income	$ 205,354	$ 213,385
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	24,269	20,439
Provision for depreciation and amortization	20,297	19,180
Amortization of investment security premiums, net	12,825	11,679
Investment securities gains (losses), net	1,035	(2,335)
Net gains on sales of loans held for sale	(4,584)	(2,671)
Origination of loans held for sale	(108,306)	(89,183)
Proceeds from sales and repayments of held for sale	112,390	91,671
Net (increase) decrease in trading securities	3,587	(23,843)
Stock-based compensation	6,879	6,394
(Increase) decrease in interest receivable	876	(1,717)
Increase (decrease) in interest payable	4,421	(601)
Increase (decrease) in income taxes payable	23,590	25,721
Other changes, net	(50,899)	19,958
Net cash provided by (used in) operating activities	251,734	288,077
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	375,462	192,522
Proceeds from maturities/pay downs of investment securities	611,223	812,970
Purchases of investment securities	(972,274)	(748,707)
Net (increase) decrease in loans	(143,629)	7,978
Purchases of land, buildings and equipment	(20,289)	(13,525)
Sales of land, buildings and equipment	1,477	1,667
Net cash provided by (used in) investing activities	(148,030)	252,905
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits	(1,080,769)	(27,222)
Net increase (decrease) in time open and C.D.'s	443,799	(83,895)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase	437,905	(340,379)
Repayment of long-term borrowings	(108)	(149)
Proceeds from (Repayments of) Short-term Debt	(4,194)	7,682
Purchases of treasury stock	(86,079)	(19,069)
Issuance of stock under equity compensation plans	(3)	(9)
Cash dividends paid on common stock	(57,540)	(50,202)
Cash dividends paid on preferred stock	(4,500)	(4,500)
Net cash provided by (used in) financing activities	(351,489)	(517,743)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(247,785)	23,239
Cash, cash equivalents and restricted cash at beginning of year	1,209,240	524,352
Cash, cash equivalents and restricted cash at June 30	961,455	547,591
Supplemental Cash Flow Information:
Income tax payments, net	26,042	24,969
Interest paid on deposits and borrowings	46,734	28,368
Loans transferred to foreclosed real estate	$ 558	$ 1,044

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The amount of cash paid for the origination of loans that are held for sale. This represents origination of mortgage and student loans held for sale.

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Payments for the value of the fractional shares of stock issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of realized and unrealized gain (loss) on investment.

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The increase (decrease) during the reporting period in the aggregate amount due to the entity in the form of unpaid interest and dividends.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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Net cash inflow (outflow) of time deposits.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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