Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income:
Loans	$ 394,144	$ 297,073
Investment securities:
Taxable	126,717	124,477
Non-taxable	10,937	5,092
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	19,216	5,756
Total interest income	551,014	432,398
Interest expense:
Deposits	27,907	4,097
Borrowings	10,221	8,438
Total interest expense	38,128	12,535
Net interest income	512,886	419,863
Provision for credit losses	28,551	27,972
Net interest income after provision for credit losses	484,335	391,891
Noninterest income:
Gains on investment securities, net	29,028	9,058
Gains on equity warrant assets, net	21,305	19,191
Foreign exchange fees	38,048	33,827
Credit card fees	27,483	21,692
Deposit service charges	20,939	17,699
Client investment fees	44,482	22,875
Lending related fees	13,937	10,735
Letters of credit and standby letters of credit fees	9,354	8,182
Investment banking revenue	49,795	0
Commissions	14,108	0
Other	11,897	12,259
Total noninterest income	280,376	155,518
Noninterest expense:
Compensation and benefits	238,061	165,806
Professional services	36,986	28,725
Premises and equipment	21,700	18,545
Net occupancy	16,048	13,616
Business development and travel	15,354	11,191
FDIC and state assessments	3,979	9,430
Other	33,536	18,104
Total noninterest expense	365,664	265,417
Income before income tax expense	399,047	281,992
Income tax expense	107,435	73,966
Net income before noncontrolling interests	291,612	208,026
Net income attributable to noncontrolling interests	(2,880)	(13,065)
Net income available to common stockholders	$ 288,732	$ 194,961
Earnings per common share—basic (dollars per share)	$ 5.49	$ 3.69
Earnings per common share—diluted (dollars per share)	$ 5.44	$ 3.63