Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income before noncontrolling interests		$ 1,011,348	$ 519,178	$ 390,266
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		87,870	92,304	106,679
Gains on investment securities, net	[1]	(88,094)	(45,547)	(21,753)
Distributions of earnings from non-marketable and other equity securities	[1]	72,015	45,867	15,991
Depreciation and amortization		57,906	56,123	46,819
Amortization of premiums and discounts on investment securities, net		(28)	2,530	6,582
Amortization of share-based compensation		45,675	36,900	35,494
Amortization of deferred loan fees		(128,077)	(111,738)	(98,150)
Deferred income tax (benefit) expense		(21,061)	25,187	(4,235)
Excess tax benefit from exercise of stock options and vesting of restricted shares	[2]	(17,989)	(18,014)	0
Losses from the write-off of premises and equipment		7,278	0	0
Other gains		0	(3,308)	(12,195)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net		(55,834)	(31,372)	(3,663)
Accounts receivable and payable, net		(23,020)	3,481	(4,945)
Income tax payable and receivable, net		(5,820)	46,168	3,672
Accrued compensation		56,874	31,689	(15,292)
Foreign exchange spot contracts, net		24,018	(20,891)	3,093
Other, net		(54,039)	15,909	41,684
Net cash provided by operating activities		933,562	646,865	471,760
Cash flows from investing activities:
Purchases of available-for-sale securities		(668,264)	(2,420,741)	(429,268)
Proceeds from sales of available-for-sale securities		474,482	580,871	2,892,460
Proceeds from maturities and pay downs of available-for-sale securities		3,436,064	3,339,574	1,364,398
Purchases of held-to-maturity securities		(4,726,595)	(5,967,223)	(1,306,010)
Proceeds from maturities and paydowns of held-to-maturity securities		1,891,761	1,708,001	1,656,580
Purchases of nonmarketable securities		(81,574)	(44,047)	(48,932)
Proceeds from sales and distributions of capital of non-marketable and other securities	[1]	95,025	51,052	62,925
Net increase in loans		(5,175,409)	(3,170,099)	(3,157,281)
Purchases of premises and equipment		(45,865)	(50,884)	(53,311)
Proceeds from sale of equity valuation services business		0	3,000	0
Net cash (used for) provided by investing activities		(4,800,375)	(5,970,496)	981,561
Cash flows from financing activities:
Net increase (decrease) in deposits		5,074,825	5,274,207	(162,908)
Net (decrease) increase in short-term borrowings		(402,318)	521,062	(262,232)
Principal payments of long-term debt		0	(97,781)	0
(Distributions to noncontrolling interests), net of contributions from noncontrolling interests		(28,494)	(23,535)	(8,195)
Common stock repurchase		(147,123)	0	0
Proceeds from issuance of common stock, ESPP and ESOP		18,387	27,003	26,147
Tax effect from stock exercises	[2]	0	0	(3,640)
Net cash provided by (used for) by financing activities		4,515,277	5,700,956	(410,828)
Net increase in cash and cash equivalents		648,464	377,325	1,042,493
Cash and cash equivalents at beginning of period		2,923,075	2,545,750	1,503,257
Cash and cash equivalents at end of period		3,571,539	2,923,075	2,545,750
Cash paid during the period for:
Interest		75,601	45,592	42,918
Income taxes		376,425	277,823	240,752
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax		(15,498)	(24,788)	15,873
Distributions of stock from investments		5,277	6,807	1,315
Equity warrant assets
Adjustments to reconcile net income to net cash provided by operating activities:
Changes in fair value of derivatives		(24,417)	(11,862)	(9,251)
Derivative
Adjustments to reconcile net income to net cash provided by operating activities:
Changes in fair value of derivatives		$ (11,043)	$ 14,261	$ (9,036)

[1] During the first quarter of 2018 we adopted ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This guidance was adopted on a retrospective basis and impacted the presentation between investing and operating activities related to distributions and net gains from our non-marketable and other equity securities portfolio. See Note 2—“Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.

[2] In 2017 we adopted ASU 2016-09, Improvements to Employee Share-Based Payment Accounting on a prospective basis with no change to prior period amounts. Note 2—“Summary of Significant Accounting Policies” of the “Notes to the Consolidated Financial Statements” under Part II, Item 8 of this report for additional details.