Interim Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest income:
Loans	$ 352,353	$ 268,445	$ 979,724	$ 745,983
Investment securities:
Taxable	142,075	109,443	403,702	294,768
Non-taxable	10,748	1,172	23,506	2,703
Federal funds sold, securities purchased under agreements to resell and other short-term investment securities	8,137	6,211	20,080	16,670
Total interest income	513,313	385,271	1,427,012	1,060,124
Interest expense:
Deposits	8,042	2,304	18,409	6,218
Borrowings	12,049	8,993	29,075	27,243
Total interest expense	20,091	11,297	47,484	33,461
Net interest income	493,222	373,974	1,379,528	1,026,663
Provision for credit losses	17,174	23,522	74,226	70,062
Net interest income after provision for credit losses	476,048	350,452	1,305,302	956,601
Noninterest income:
Gains on investment securities, net	32,193	15,238	77,365	48,838
Gains on equity warrant assets, net	34,141	24,922	72,393	42,432
Foreign exchange fees	32,656	29,671	100,560	82,026
Fees and Commissions, Credit and Debit Cards1	24,121	20,270	68,739	56,099
Credit card fees	24,121	20,270	68,739	56,099
Deposit service charges	19,588	14,508	56,081	43,046
Client investment fees	36,265	15,563	88,592	37,571
Lending related fees	10,675	15,404	30,938	32,874
Letters of credit and standby letters of credit fees	8,409	7,306	24,938	20,951
Other	12,022	15,896	38,671	41,128
Total noninterest income	210,070	158,778	558,277	404,965
Noninterest expense:
Compensation and benefits	195,437	153,263	543,198	449,412
Professional services	36,542	32,987	112,080	86,331
Premises and equipment	19,858	18,937	57,576	53,753
Net occupancy	13,694	12,660	40,598	35,437
Business development and travel	12,712	10,329	35,998	30,913
FDIC and state assessments	9,550	8,359	29,306	26,354
Correspondent bank fees	3,513	3,162	10,200	9,770
Other	18,139	18,064	51,645	54,670
Total noninterest expense	309,445	257,761	880,601	746,640
Income before income tax expense	376,673	251,469	982,978	614,926
Income tax expense	95,308	97,351	246,561	220,412
Net income before noncontrolling interests	281,365	154,118	736,417	394,514
Net income attributable to noncontrolling interests	(6,548)	(5,498)	(28,841)	(21,218)
Net income available to common stockholders	$ 274,817	$ 148,620	$ 707,576	$ 373,296
Earnings per common share—basic (dollars per share)	$ 5.16	$ 2.82	$ 13.33	$ 7.11
Earnings per common share—diluted (dollars per share)	$ 5.10	$ 2.79	$ 13.15	$ 7.01