Interim Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income before noncontrolling interests	$ 381,438,000	$ 628,183,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	309,961,000	52,497,000
Gains on investment securities, net	(80,923,000)	(76,726,000)
Distributions of earnings from non-marketable and other equity securities	49,125,000	40,584,000
Depreciation and amortization	49,650,000	40,824,000
Amortization of premiums and discounts on investment securities, net	29,633,000	4,993,000
Amortization of share-based compensation	39,325,000	31,768,000
Amortization of deferred loan fees	(78,042,000)	(76,712,000)
Deferred income tax benefit	(72,755,000)	(3,854,000)
Excess tax benefit from exercise of stock options and vesting of restricted shares	(2,181,000)	(7,369,000)
Losses from the write-off of premises and equipment	0	185,000
Changes in other assets and liabilities:
Accrued interest receivable and payable, net	16,606,000	(3,850,000)
Accounts receivable and payable, net	2,770,000	22,308,000
Income tax receivable and payable, net	131,253,000	(87,097,000)
Accrued compensation	(115,203,000)	(175,469,000)
Foreign exchange spot contracts, net	(5,900,000)	108,307,000
Proceeds from termination of interest rate swaps	227,500,000	0
Other, net	(98,635,000)	(37,218,000)
Net cash provided by operating activities	745,478,000	450,571,000
Cash flows from investing activities:
Purchases of available-for-sale securities	(8,071,014,000)	(2,553,326,000)
Proceeds from sales of available-for-sale securities	2,654,212,000	2,189,087,000
Proceeds from maturities and paydowns of available-for-sale securities	1,550,220,000	382,054,000
Purchases of held-to-maturity securities	(568,002,000)	(277,889,000)
Proceeds from maturities and paydowns of held-to-maturity securities	1,543,942,000	888,943,000
Purchases of non-marketable and other equity securities	(118,737,000)	(39,287,000)
Proceeds from sales and distributions of capital of non-marketable and other securities	57,745,000	59,187,000
Net increase in loans	(3,530,020,000)	(844,830,000)
Purchases of premises and equipment	(51,214,000)	(18,632,000)
Acquisition of SVB Leerink, net of cash acquired	0	(102,328,000)
Net cash used for investing activities	(6,532,868,000)	(317,021,000)
Cash flows from financing activities:
Net increase in deposits	12,747,957,000	6,281,640,000
Net increase (decrease) in short-term borrowings	33,494,000	(607,160,000)
Proceeds from issuance of 3.125% Senior Notes	495,024,000	0
(Distributions to noncontrolling interests), net of contributions from noncontrolling interests	(14,120,000)	(23,222,000)
Payment of preferred stock dividend	(7,963,000)	0
Common stock repurchases	(60,020,000)	(346,781,000)
Proceeds from issuance of common stock, ESPP and ESOP, net of restricted stock awards	13,341,000	11,359,000
Net cash provided by financing activities	13,207,713,000	5,315,836,000
Net increase in cash and cash equivalents	7,420,323,000	5,449,386,000
Cash and cash equivalents at beginning of period	6,781,783,000	3,571,539,000
Cash and cash equivalents at end of period	14,202,106,000	9,020,925,000
Cash paid during the period for:
Interest	67,493,000	94,851,000
Income taxes	57,539,000	310,604,000
Noncash items during the period:
Changes in unrealized gains and losses on available-for-sale securities, net of tax	382,707,000	122,597,000
Distributions of stock from investments	11,093,000	6,747,000
Equity warrant assets
Changes in fair values of derivatives, net	20,632,000	(825,000)
Derivative
Changes in fair values of derivatives, net	$ (58,776,000)	$ (9,958,000)