Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income
Loans and leases, including fees	$ 1,246,742	$ 926,965	$ 2,117,342	$ 1,899,547
Investment securities
Fully taxable	119,392	34,456	158,524	71,527
Exempt from federal taxes	17,783	10	17,833	65
Deposits at banks	80,773	8,710	99,053	15,584
Other	452	217	646	597
Total interest income	1,465,142	970,358	2,393,398	1,987,320
Interest expense
Savings and interest-checking deposits	27,907	8,052	34,654	19,556
Time deposits	1,227	5,084	2,624	12,094
Deposits at Cayman Islands office		16		201
Short-term borrowings	3,419	1	3,420	3
Long-term borrowings	20,872	14,865	36,809	31,731
Total interest expense	53,425	28,018	77,507	63,585
Net interest income	1,411,717	942,340	2,315,891	1,923,735
Provision for credit losses	302,000	(15,000)	312,000	(40,000)
Net interest income after provision for credit losses	1,109,717	957,340	2,003,891	1,963,735
Other income
Brokerage services income	24,138	10,265	44,328	23,378
Trading account and non-hedging derivative gains	2,293	6,502	7,662	12,786
Loss on bank investment securities	(62)	(10,655)	(805)	(22,937)
Other revenues from operations	147,551	112,699	283,754	223,629
Total other income	571,100	513,633	1,111,987	1,019,231
Other expense
Salaries and employee benefits	776,201	479,134	1,353,721	1,020,212
Equipment and net occupancy	124,655	80,848	210,467	163,319
Outside data processing and software	93,820	74,492	173,539	140,243
FDIC assessments	22,585	17,876	38,161	32,064
Advertising and marketing	20,635	13,364	36,659	27,992
Printing, postage and supplies	15,570	11,133	25,720	20,450
Amortization of core deposit and other intangible assets	18,384	2,737	19,640	5,475
Other costs of operations	331,304	185,761	504,988	375,034
Total other expense	1,403,154	865,345	2,362,895	1,784,789
Income before taxes	277,663	605,628	752,983	1,198,177
Income taxes	60,141	147,559	173,287	292,859
Net income	217,522	458,069	579,696	905,318
Net income available to common shareholders
Basic	192,236	438,756	531,914	866,848
Diluted	$ 192,236	$ 438,759	$ 531,916	$ 866,852
Net income per common share
Basic	$ 1.08	$ 3.41	$ 3.47	$ 6.74
Diluted	$ 1.08	$ 3.41	$ 3.45	$ 6.73
Average common shares outstanding
Basic	177,367	128,671	153,290	128,604
Diluted	178,277	128,842	153,981	128,756
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 82,926	$ 133,313	$ 192,074	$ 272,067
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	124,170	98,518	225,677	191,295
Trust Income [Member]
Other income
Revenue from contract with customer	$ 190,084	$ 162,991	$ 359,297	$ 319,013