Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities:
Net income before noncontrolling interests		$ 519,178	$ 390,266		$ 374,820
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		92,304	106,679	[1]	95,683	[1]
Gains on investment securities, net		(64,603)	(51,740)		(89,445)
Depreciation and amortization		56,123	46,819		40,008
Amortization of premiums and discounts on available-for-sale securities, net		2,530	6,582		18,271
Amortization of share-based compensation		36,900	35,494		32,239
Amortization of deferred loan fees		(111,738)	(98,150)		(89,384)
Deferred income tax (benefit) expense		25,187	(4,235)		(9,133)
Excess Tax Benefit from Share-based Compensation, Operating Activities	[2]	(18,014)	0		0
Gain (Loss) on Disposition of Business		(5,124)	0		(1,287)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net		(31,372)	(3,663)		(8,397)
Accounts receivable and payable, net		3,481	(4,945)		(24,029)
Income tax payable and receivable, net		46,168	3,672		(9,857)
Accrued compensation		31,689	(15,292)		30,293
Foreign exchange spot contracts, net		(20,891)	3,093		(31,159)
Other, net		15,882	41,684		64,044
Net cash provided by operating activities		580,099	437,977		339,197
Cash flows from investing activities:
Purchases of available-for-sale securities		(2,420,741)	(429,268)		(4,586,680)
Proceeds from sales of available-for-sale securities		580,871	2,892,460		8,054
Proceeds from maturities and pay downs of available-for-sale securities		3,339,574	1,364,398		1,704,918
Purchases of held-to-maturity securities		(5,967,223)	(1,306,010)		(2,888,805)
Proceeds from maturities and paydowns of held-to-maturity securities		1,708,001	1,656,580		1,495,362
Purchases of nonmarketable securities		(43,994)	(48,932)		(39,455)
Proceeds from sales of nonmarketable securities		117,765	96,708		138,453
Net increase in loans		(3,170,099)	(3,157,281)		(2,328,944)
Purchases of premises and equipment		(50,884)	(53,311)		(53,918)
Proceeds from Divestiture of Businesses		3,000			39,284	[3]
Effect of deconsolidation due to adoption of ASU 2015-02		0	0		15,995
Net cash used for investing activities		(5,903,730)	1,015,344		(6,495,736)
Cash flows from financing activities:
Net increase in deposits		5,274,207	(162,908)		4,719,738
Increase (decrease) in short-term borrowings		521,062	(262,232)		767,119
Repayments of Other Long-term Debt		(97,781)	0		0
Proceeds from (Payments of) Capital Calls (Distributions) from Noncontrolling Interest		(23,535)	(8,195)		(23,518)
Proceeds from issuance of common stock, ESPP, and ESOP		27,003	26,147		22,410
Tax benefit from stock exercises	[2]	0	(3,640)		16,602
Proceeds from issuance of 3.50% Senior Notes		0	0		346,431
Net cash provided by financing activities		5,700,956	(410,828)		5,848,782
Net increase (decrease) in cash and cash equivalents		377,325	1,042,493		(307,757)
Cash and cash equivalents at beginning of period		2,545,750	1,503,257		1,811,014	[3]
Cash and cash equivalents at end of period		2,923,075	2,545,750		1,503,257
Cash paid during the period for:
Interest		45,592	42,918		35,280
Income taxes		277,823	240,752		220,484
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax		(24,788)	15,873		(22,692)
Distributions Of Stock From Investments		6,807	1,315		64,503	[4]
Equity warrant assets
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized Gain (Loss) on Derivatives		(11,862)	(9,251)		(54,678)
Derivative
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized Gain (Loss) on Derivatives		$ 14,261	$ (9,036)		$ 1,208

[1] Our consolidated statements of income for the years ended December 31, 2016 and 2015 were modified from prior periods’ presentation to conform to the current period's presentation, which reflects our provision for loan losses and provision for unfunded credit commitments together as our “provision for credit losses”. In prior periods, our provision for unfunded credit commitments were reported separately as a component of noninterest expense.

[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. See Note 2- "Summary of Significant Accounting Policies" of the "Notes to Consolidated Financial Statements" under Part II, Item 8 of this report for additional details.

[3] Cash and cash equivalents at December 31, 2014 included $15.0 million recognized in assets held-for-sale in conjunction with the SVBIF sale transaction. On April 13, 2015 we received net proceeds of $39.3 million consisting of the sales price of $48.6 million less $9.3 million of cash and cash equivalents held by SVBIF that were sold.

[4] For the year ended December 31, 2015, includes distributions to our noncontrolling interests of $41.5 million.