Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 187,032	$ 169,736
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,858	33,061
Accretion of discount and amortization of premiums, net	(2,680)	(4,931)
Stock compensation costs	6,158	5,151
Deferred income tax expense	677	2,295
Provision for credit losses	20,218	7,068
Net gains on sales of loans	(1,582)	(2,754)
Net gains on sales of available-for-sale investment securities	(2,129)	(2,474)
Net gains on sales of premises and equipment	(1,086)	(72,007)
Net gain on sale of business	(31,470)	0
Originations and purchases of loans held-for-sale	(4,617)	(4,287)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	2,545	4,773
Proceeds from distributions received from equity method investees	887	8
Net change in accrued interest receivable and other assets	14,465	93,647
Net change in accrued expenses and other liabilities	(570)	(37,791)
Other net operating activities	148	(5,220)
Total adjustments	30,822	16,539
Net cash provided by operating activities	217,854	186,275
Net (increase) decrease in:
Loans held-for-investment	(619,671)	(1,085,449)
Interest-bearing deposits with banks	(71,203)	75,140
Investments in qualified affordable housing partnerships, tax credit and other investments	(22,799)	(39,531)
Payment for sale of business, net of cash transferred	(503,687)	0
Purchases of:
Resale agreements	0	(200,000)
Available-for-sale investment securities	(157,933)	(50,936)
Loans held-for-investment	(80,077)	(147,242)
Premises and equipment	(1,757)	(1,191)
Proceeds from sale of:
Available-for-sale investment securities	214,790	302,656
Loans held-for-investment	112,964	276,643
Other real estate owned (“OREO”)	2,716	3,958
Premises and equipment	0	116,021
Paydowns and maturities of resale agreements	0	400,000
Proceeds from distributions received from equity method investees	629	1,169
Repayments, maturities and redemptions of available-for-sale investment securities	87,677	125,006
Other net investing activities	(1,967)	10,355
Net cash used in investing activities	(1,040,318)	(213,401)
Net increase (decrease) in:
Deposits	964,380	646,188
Short-term borrowings	30,215	(18,524)
Payments for:
Repayment of long-term debt	(5,000)	(5,000)
Repurchase of vested shares due to employee tax liability	(14,946)	(12,154)
Cash dividends on common stock	(30,235)	(30,039)
Net cash provided by financing activities	944,414	580,471
Effect of exchange rate changes on cash and cash equivalents	18,396	2,795
NET INCREASE IN CASH AND CASH EQUIVALENTS	140,346	556,140
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,314,938	2,434,643
Cash paid (received) during the period for:
Interest paid	43,218	30,361
Income taxes paid (refunded), net	10,084	(230)
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	$ 155,767	$ 278,024