Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest income:
Loans	$ 214,227	$ 174,993	$ 617,456	$ 507,746
Investment securities:
Taxable	83,468	87,609	261,121	253,496
Non-taxable	522	707	1,693	2,220
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	2,196	1,482	5,793	4,071
Total interest income	300,413	264,791	886,063	767,533
Interest expense:
Deposits	1,535	1,158	3,984	4,283
Borrowings	9,717	8,973	28,161	25,894
Total interest expense	11,252	10,131	32,145	30,177
Net interest income	289,161	254,660	853,918	737,356
Provision for loan losses	18,950	33,403	88,624	66,368
Net interest income after provision for loan losses	270,211	221,257	765,294	670,988
Noninterest income:
Gains on investment securities, net	23,178	18,768	41,764	77,006
Gains on derivative instruments, net	19,744	10,244	26,847	66,290
Foreign exchange fees	25,944	22,995	76,998	63,037
Credit card fees	18,295	14,536	49,226	40,841
Deposit service charges	13,356	12,272	39,142	34,309
Client investment fees	7,952	5,683	23,959	15,429
Lending related fees	8,168	7,561	23,783	23,746
Letters of credit and standby letters of credit fees	6,811	5,341	18,414	15,315
Other	20,692	11,077	42,917	22,315
Total noninterest income	144,140	108,477	343,050	358,288
Noninterest expense:
Compensation and benefits	136,568	109,345	374,410	350,030
Professional services	23,443	21,137	67,959	58,834
Premises and equipment	16,291	12,356	47,861	36,800
Business development and travel	8,504	8,028	30,077	28,904
Net occupancy	9,525	8,548	28,919	24,010
FDIC and state assessments	7,805	6,954	21,624	18,705
Correspondent bank fees	3,104	3,070	9,469	9,775
Provision for unfunded credit commitments	1,054	1,047	1,601	249
Other	15,533	14,270	44,292	42,101
Total noninterest expense	221,827	184,755	626,212	569,408
Income before income tax expense	192,524	144,979	482,132	459,868
Income tax expense	76,877	57,017	195,508	175,057
Net income before noncontrolling interests	115,647	87,962	286,624	284,811
Net income attributable to noncontrolling interests	(4,566)	(6,229)	(3,405)	(28,419)
Net income available to common stockholders	$ 111,081	$ 81,733	$ 283,219	$ 256,392
Earnings per common share—basic (dollars per share)	$ 2.13	$ 1.59	$ 5.46	$ 5.00
Earnings per common share—diluted (dollars per share)	$ 2.12	$ 1.57	$ 5.42	$ 4.94