Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income:
Loans	$ 382,569	$ 394,144
Investment securities:
Taxable	154,385	126,717
Non-taxable	12,824	10,937
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	17,624	19,216
Total interest income	567,402	551,014
Interest expense:
Deposits	37,398	27,907
Borrowings	5,867	10,221
Total interest expense	43,265	38,128
Net interest income	524,137	512,886
Provision for credit losses	243,480	28,551
Net interest income after provision for credit losses	280,657	484,335
Noninterest income:
Gains on investment securities, net	46,055	29,028
Gains on equity warrant assets, net	13,395	21,305
Client investment fees	43,393	44,482
Foreign exchange fees	47,505	38,048
Credit card fees	28,304	27,483
Deposit service charges	24,589	20,939
Lending related fees	13,125	13,937
Letters of credit and standby letters of credit fees	11,542	9,354
Investment banking revenue	46,867	49,795
Commissions	16,022	14,108
Other	11,137	11,897
Total noninterest income	301,934	280,376
Noninterest expense:
Compensation and benefits	255,586	238,061
Professional services	38,705	36,986
Premises and equipment	26,940	21,700
Net occupancy	18,346	16,048
Business development and travel	14,071	15,354
FDIC and state assessments	5,234	3,979
Other	40,703	33,536
Total noninterest expense	399,585	365,664
Income before income tax expense	183,006	399,047
Income tax expense	49,357	107,435
Net income before noncontrolling interests	133,649	291,612
Net loss (income) attributable to noncontrolling interests	1,973	(2,880)
Preferred stock dividends	(3,369)	0
Net income available to common stockholders	$ 132,253	$ 288,732
Earnings per common share—basic (dollars per share)	$ 2.56	$ 5.49
Earnings per common share—diluted (dollars per share)	$ 2.55	$ 5.44