Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)
Cash flows from operating activities:
Net income before noncontrolling interests	$ 390,266	$ 374,820	[1],[2]	$ 478,660
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	95,697	97,629		59,486
Provision for (Reduction of) unfunded credit commitments	10,982	(1,946)		6,511
Changes in fair values of derivatives, net	(18,287)	(53,470)		(22,139)
Gains on investment securities, net	(51,740)	(89,445)	[2],[3]	(267,023)
Depreciation and amortization	46,819	40,008		39,345
Impairment (gain) loss on SVBIF Sale Transaction	0	(1,287)		13,934
Amortization of premiums and discounts on available-for-sale securities, net	6,582	18,271		25,311
Amortization of share-based compensation	35,494	32,239		29,545
Amortization of deferred loan fees	(98,150)	(89,384)		(82,724)
Deferred income tax (benefit) expense	(4,235)	(9,133)		(43,110)
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	(3,663)	(8,397)		(26,642)
Accounts receivable and payable, net	(4,945)	(24,029)		(302)
Income tax payable and receivable, net	3,672	(9,857)		(4,804)
Accrued compensation	(15,292)	30,293		3,707
Foreign exchange spot contracts, net	3,093	(31,159)		25,725
Other, net	41,684	64,044		19,788
Net cash provided by operating activities	437,977	339,197		255,268
Cash flows from investing activities:
Purchases of available-for-sale securities	(429,268)	(4,586,680)		(8,462,071)
Proceeds from sales of available-for-sale securities	2,892,460	8,054		30,398
Proceeds from maturities and pay downs of available-for-sale securities	1,364,398	1,704,918		1,569,173
Purchases of held-to-maturity securities	(1,306,010)	(2,888,805)		(2,612,848)
Proceeds from maturities and paydowns of held-to-maturity securities	1,656,580	1,495,362		598,454
Purchases of nonmarketable securities	(48,932)	(39,455)		(335,842)
Proceeds from sales of nonmarketable securities	96,708	138,453		495,612
Net increase in loans	(3,169,493)	(2,335,153)		(3,480,531)
Proceeds from recoveries of charged-off loans	12,212	6,209		6,404
Purchases of premises and equipment	(53,311)	(53,918)		(42,431)
Effect of deconsolidation due to adoption of ASU 2015-02	0	15,995		0
Net proceeds from SVBIF sale transaction	0	39,284	[4]	0
Net cash used for investing activities	1,015,344	(6,495,736)		(12,233,682)
Cash flows from financing activities:
Net increase in deposits	(162,908)	4,719,738		11,870,520
Increase (decrease) in short-term borrowings	(262,232)	767,119		2,701
Proceeds from (Payments of) Capital Calls (Distributions) from Noncontrolling Interest	(8,195)	(23,518)		(89,186)
Proceeds from issuance of common stock, ESPP, and ESOP	26,147	22,410		22,146
Tax benefit from stock exercises	(3,640)	16,602		9,602
Proceeds from issuance of 3.50% Senior Notes	0	346,431		0
Net proceeds from public equity offering	0	0		434,866
Net cash provided by financing activities	(410,828)	5,848,782		12,250,649
Net increase (decrease) in cash and cash equivalents	1,042,493	(307,757)		272,235
Cash and cash equivalents at beginning of period	1,503,257	1,811,014	[4]	1,538,779
Cash and cash equivalents at end of period	2,545,750	1,503,257		1,811,014	[4]
Cash and cash equivalents, at end of period, including discontinued operations	2,545,750	1,503,257		1,811,014	[4]
Cash paid during the period for:
Interest	42,918	35,280		35,181
Income taxes	240,752	220,484		208,558
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	15,873	(22,692)		66,520
Distributions Of Stock From Investments	1,315	64,503	[5]	20,621
Transfers from available-for-sale securities to held-to-maturity	$ 0	0		$ 5,418,572
Distributions of stock from investments to NCI		$ 41,500

[1] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. 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] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. 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.

[3] During the second quarter of 2015 we adopted new accounting guidance related to our consolidated variable interest entities (ASU 2015-02). Amounts prior to January 1, 2015 have not been revised for the adoption of this guidance. 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.

[4] 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.

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