Consolidated Statement of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income		$ 674,035	$ 703,701	$ 505,624
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		144,178	139,499	149,822
Accretion of discount and amortization of premiums, net		(22,379)	(20,572)	(7,260)
Stock compensation costs		30,761	30,937	24,657
Deferred income tax (benefit) expense		(21,604)	(16,470)	33,856
Provision for credit losses		98,685	64,255	46,266
Net gains on sales of loans		(4,035)	(6,590)	(8,870)
Net gains on sales of AFS investment securities		(3,930)	(2,535)
Net gains on sales of AFS investment securities				(8,037)
Net gains on sales of fixed assets		(114)	(6,683)	(77,388)
Net gain on sale of business		0	(31,470)	(3,807)
Loans held-for-sale:
Originations and purchases		(10,569)	(20,176)	(20,521)
Proceeds from sales and paydowns/payoffs of loans originally classified as held-for-sale		10,436	20,068	21,363
Proceeds from distributions received from equity method investees		3,470	3,761	3,582
Net change in accrued interest receivable and other assets		(170,819)	(60,791)	45,354
Net change in other liabilities		7,012	88,070	(1,965)
Other net operating activities		702	(1,832)	599
Total adjustments		61,794	179,471	197,651
Net cash provided by operating activities		735,829	883,172	703,275
Net (increase) decrease in:
Investments in qualified affordable housing partnerships, tax credit and other investments		(146,902)	(132,605)	(173,630)
Interest-bearing deposits with banks		193,455	4,212	(63,096)
Resale agreements:
Proceeds from paydowns and maturities		650,000	175,000	1,250,000
Purchases		(325,000)	(160,000)	(600,000)
AFS investment securities:
Proceeds from sales		627,110	364,270
Proceeds from sales				832,844
Proceeds from repayments, maturities and redemptions		1,155,002	742,132
Proceeds from repayments, maturities and redemptions				413,593
Purchases		(2,303,317)	(888,673)
Purchases				(828,604)
Loans held-for-investment:
Proceeds from sales of loans originally classified as held-for-investment		288,823	483,948	566,688
Purchases		(524,142)	(597,112)	(534,816)
Other changes in loans held-for-investment, net		(2,184,915)	(3,313,382)	(3,514,786)
Premises and equipment:
Proceeds from sales		403	1,638	119,749
Purchases		(9,859)	(13,787)	(13,754)
Sales of businesses, net of cash transferred:
Proceeds		0	0	3,633
Payments		0	(503,687)	0
Proceeds from sales of other real estate owned (“OREO”)		1,224	4,484	6,999
Proceeds from distributions received from equity method investees		9,502	5,185	8,387
Other net investing activities		(2,560)	(4,035)	19,969
Net cash (used in) provided by investing activities		(2,571,176)	(3,832,412)	(2,506,824)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in deposits		1,902,741	3,903,192	2,272,500
Net (decrease) increase in short-term borrowings		(28,535)	61,392	(61,560)
FHLB advances
Proceeds		1,500,000	0	0
Repayment		(1,082,001)	0	0
Repayment of long-term debt and lease liabilities		(884)	(25,000)	(15,000)
Common stock:
Proceeds from issuance pursuant to various stock compensation plans and agreements		3,383	2,846	2,280
Stocks tendered for payment of withholding taxes		(14,635)	(15,634)	(12,940)
Cash dividends paid		(155,107)	(125,988)	(116,820)
Net cash (used in) provided by financing activities		2,124,962	3,800,808	2,068,460
Effect of exchange rate changes on cash and cash equivalents		(29,843)	(24,783)	31,178
NET INCREASE IN CASH AND CASH EQUIVALENTS		259,772	826,785	296,089
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR		3,001,377	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF YEAR		3,261,149	3,001,377	2,174,592
Cash paid during the year for:
Interest		418,840	253,026	138,766
Income taxes, net		158,296	85,872	98,126
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	[1]	285,637	481,593	613,088
Loans transferred from held-for-sale to held-for-investment		0	2,306	0
Deposits transferred to branch liability held-for-sale		0	0	605,111
Investment security transferred from held-to-maturity to AFS		0	0	115,615
Premises and equipment transferred to branch assets held-for-sale		0	0	8,043
Loans transferred to OREO		$ 2,013	$ 1,206	$ 777

[1] December 31, 2017 amount includes loans transferred from held-for-investment to branch assets held-for-sale.