Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Loans	$ 430,422	$ 382,569
Investment securities:
Taxable	224,162	154,385
Non-taxable	20,897	12,824
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	3,265	17,624
Total interest income	678,746	567,402
Interest expense:
Deposits	10,437	37,398
Borrowings	8,730	5,867
Total interest expense	19,167	43,265
Net interest income	659,579	524,137
Provision for credit losses	18,679	243,480
Net interest income after provision for credit losses	640,900	280,657
Noninterest income:
Gains on investment securities, net	167,078	46,055
Gains on equity warrant assets, net	221,685	13,395
Client investment fees	20,065	43,393
Foreign exchange fees	57,393	47,505
Credit card fees	27,567	28,304
Deposit service charges	25,151	24,589
Lending related fees	15,657	13,125
Letters of credit and standby letters of credit fees	13,051	11,542
Investment banking revenue	142,302	46,867
Commissions	24,439	16,022
Other	29,792	11,137
Total noninterest income	744,180	301,934
Noninterest expense:
Compensation and benefits	445,425	255,586
Professional services	81,343	38,705
Premises and equipment	32,822	26,940
Net occupancy	17,681	18,346
Business development and travel	3,811	14,071
FDIC and state assessments	9,463	5,234
Other	45,456	40,703
Total noninterest expense	636,001	399,585
Income before income tax expense	749,079	183,006
Income tax expense	187,315	49,357
Net income before noncontrolling interests	561,764	133,649
Net income attributable to noncontrolling interests	(24,950)	1,973
Preferred stock dividends	(4,594)	(3,369)
Net income available to common stockholders	$ 532,220	$ 132,253
Earnings per common share—basic (dollars per share)	$ 10.20	$ 2.56
Earnings per common share—diluted (dollars per share)	$ 10.03	$ 2.55