Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 359,381	$ 288,066
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,329	79,166
Accretion of discount and amortization of premiums, net	(9,910)	(13,348)
Stock compensation costs	13,215	10,115
Deferred income tax expense	1,320	3,699
Provision for credit losses	35,754	17,753
Net gains on sales of loans	(3,936)	(4,300)
Net gains on sales of available-for-sale investment securities	(2,339)	(5,194)
Net gains on sales of premises and equipment	(2,200)	(73,049)
Net gain on sale of business	(31,470)	0
Originations and purchases of loans held-for-sale	(11,547)	(9,806)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	10,759	9,984
Proceeds from distributions received from equity method investees	1,814	1,185
Net change in accrued interest receivable and other assets	(32,226)	94,438
Net change in accrued expenses and other liabilities	44,016	(14,986)
Other net operating activities	(93)	(733)
Total adjustments	75,486	94,924
Net cash provided by operating activities	434,867	382,990
Net (increase) decrease in:
Loans held-for-investment	(1,147,156)	(1,660,828)
Interest-bearing deposits with banks	28,525	31,060
Investments in qualified affordable housing partnerships, tax credit and other investments	(41,444)	(73,286)
Payment for sale of business, net of cash transferred	(503,687)	0
Purchases of:
Resale agreements	(100,000)	(550,000)
Available-for-sale investment securities	(235,360)	(272,698)
Loans held-for-investment	(389,912)	(368,698)
Premises and equipment	(7,612)	(4,990)
Proceeds from sale of:
Available-for-sale investment securities	256,875	551,889
Loans held-for-investment	274,785	361,380
Other real estate owned (“OREO”)	3,595	5,298
Premises and equipment	0	116,021
Paydowns and maturities of resale agreements	175,000	950,000
Proceeds from distributions received from equity method investees	1,725	2,634
Repayments, maturities and redemptions of available-for-sale investment securities	211,303	244,770
Other net investing activities	(2,200)	21,005
Net cash used in investing activities	(1,475,563)	(646,443)
Net (increase) decrease in:
Deposits	1,195,796	1,245,282
Short-term borrowings	59,895	(36,521)
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	(10,000)	(10,000)
Repurchase of vested shares due to employee tax liability	(15,161)	(12,259)
Cash dividends on common stock	(59,243)	(58,949)
Net cash provided by financing activities	1,172,615	1,128,561
Effect of exchange rate changes on cash and cash equivalents	(9,040)	8,865
NET INCREASE IN CASH AND CASH EQUIVALENTS	122,879	873,973
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,297,471	2,752,476
Cash paid during the period for:
Interest paid	99,176	63,416
Income taxes paid, net	67,431	14,799
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	$ 285,631	$ 343,977