Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income
Loans and leases, including fees	$ 870,600	$ 972,582
Investment securities
Fully taxable	39,132	37,071
Exempt from federal taxes	50	55
Deposits at banks	18,280	6,874
Other	194	380
Total interest income	928,256	1,016,962
Interest expense
Savings and interest-checking deposits	6,747	11,504
Time deposits	1,397	7,010
Deposits at Cayman Islands office		185
Short-term borrowings	1	2
Long-term borrowings	15,937	16,866
Total interest expense	24,082	35,567
Net interest income	904,174	981,395
Provision for credit losses	10,000	(25,000)
Net interest income after provision for credit losses	894,174	1,006,395
Other income
Brokerage services income	20,190	13,113
Trading account and foreign exchange gains	5,369	6,284
Loss on bank investment securities	(743)	(12,282)
Other revenues from operations	136,203	110,930
Total other income	540,887	505,598
Other expense
Salaries and employee benefits	577,520	541,078
Equipment and net occupancy	85,812	82,471
Outside data processing and software	79,719	65,751
FDIC assessments	15,576	14,188
Advertising and marketing	16,024	14,628
Printing, postage and supplies	10,150	9,317
Amortization of core deposit and other intangible assets	1,256	2,738
Other costs of operations	173,684	189,273
Total other expense	959,741	919,444
Income before taxes	475,320	592,549
Income taxes	113,146	145,300
Net income	362,174	447,249
Net income available to common shareholders
Basic	339,589	428,091
Diluted	$ 339,590	$ 428,093
Net income per common share
Basic	$ 2.63	$ 3.33
Diluted	$ 2.62	$ 3.33
Average common shares outstanding
Basic	128,945	128,537
Diluted	129,416	128,669
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 109,148	$ 138,754
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	101,507	92,777
Trust Income [Member]
Other income
Revenue from contract with customer	$ 169,213	$ 156,022