Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Loans	$ 297,073	$ 227,341
Investment securities:
Taxable	124,477	89,803
Non-taxable	5,092	646
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	5,756	3,136
Total interest income	432,398	320,926
Interest expense:
Deposits	4,097	1,717
Borrowings	8,438	9,216
Total interest expense	12,535	10,933
Net interest income	419,863	309,993
Provision for credit losses	27,972	30,734
Net interest income after provision for credit losses	391,891	279,259
Noninterest income:
Gains on investment securities, net	9,058	15,970
Gains on equity warrant assets, net	19,191	6,690
Foreign exchange fees	33,827	26,247
Credit card fees	21,692	17,730
Deposit service charges	17,699	13,975
Client investment fees	22,875	9,026
Lending related fees	10,735	8,961
Letters of credit and standby letters of credit fees	8,182	6,639
Other	12,259	12,421
Total noninterest income	155,518	117,659
Noninterest expense:
Compensation and benefits	165,806	147,176
Professional services	28,725	25,419
Premises and equipment	18,545	15,858
Net occupancy	13,616	11,651
Business development and travel	11,191	9,195
FDIC and state assessments	9,430	8,682
Correspondent bank fees	3,410	3,445
Other	14,694	16,207
Total noninterest expense	265,417	237,633
Income before income tax expense	281,992	159,285
Income tax expense	73,966	51,405
Net income before noncontrolling interests	208,026	107,880
Net income attributable to noncontrolling interests	(13,065)	(6,397)
Net income available to common stockholders	$ 194,961	$ 101,483
Earnings per common share—basic (dollars per share)	$ 3.69	$ 1.94
Earnings per common share—diluted (dollars per share)	$ 3.63	$ 1.91