Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 530,683	$ 420,726
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	95,777	123,008
Accretion of discount and amortization of premiums, net	(14,471)	(19,237)
Stock compensation costs	24,201	15,780
Deferred income tax expense (benefit)	1,371	(14,500)
Provision for credit losses	46,296	30,749
Net gains on sales of loans	(5,081)	(6,660)
Net gains on sales of available-for-sale investment securities	(2,374)
Net gains on sales of available-for-sale investment securities		(6,733)
Net gains on sales of premises and equipment	(5,602)	(74,092)
Net gain on sale of business	(31,470)	(3,807)
Originations and purchases of loans held-for-sale	(17,642)	(15,069)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	16,652	15,792
Proceeds from distributions received from equity method investees	2,670	2,329
Net change in accrued interest receivable and other assets	(38,164)	105,350
Net change in accrued expenses and other liabilities	92,036	95,432
Other net operating activities	(1,566)	385
Total adjustments	162,633	248,727
Net cash provided by operating activities	693,316	669,453
Net increase in:
Loans held-for-investment	(2,160,858)	(2,967,873)
Interest-bearing deposits with banks	(24,925)	(74,254)
Investments in qualified affordable housing partnerships, tax credit and other investments	(72,983)	(130,061)
Payment for sale of business, net of cash transferred	(503,687)	0
Purchases of:
Resale agreements	(160,000)	(550,000)
Available-for-sale investment securities	(514,622)
Available-for-sale investment securities		(501,669)
Loans held-for-investment	(451,037)	(441,141)
Premises and equipment	(9,418)	(11,598)
Proceeds from sale of:
Available-for-sale investment securities	296,252
Available-for-sale investment securities		676,776
Loans held-for-investment	363,209	448,679
Other real estate owned (“OREO”)	3,602	5,431
Premises and equipment	0	116,021
Business, net of cash transferred	0	3,633
Paydowns and maturities of resale agreements	175,000	1,000,000
Proceeds from distributions received from equity method investees	4,264	6,142
Repayments, maturities and redemptions of available-for-sale investment securities	404,070
Repayments, maturities and redemptions of available-for-sale investment securities		323,463
Other net investing activities	(3,002)	25,773
Net cash used in investing activities	(2,654,135)	(2,070,678)
Net increase (decrease) in:
Deposits	2,092,022	1,385,625
Short-term borrowings	63,131	(36,604)
Proceeds from:
Issuance of common stock pursuant to various stock compensation plans and agreements	1,328	1,008
Payments for:
Repayment of long-term debt	(15,000)	(10,000)
Withholding taxes paid related to net share settlement of equity awards	(15,502)	(12,663)
Cash dividends on common stock	(92,632)	(87,880)
Net cash provided by financing activities	2,033,347	1,239,486
Effect of exchange rate changes on cash and cash equivalents	(28,333)	19,985
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	44,195	(141,754)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,218,787	1,736,749
Cash paid during the period for:
Interest	166,422	98,409
Income taxes, net	71,064	11,800
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	363,591	418,489
Loans transferred from held-for-sale to held-for-investment	2,306	0
Investment security transferred from held-to-maturity to available-for-sale	$ 0	$ 115,615