Commitments to originate real estate loans for sale.

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Commitments to sell real estate loans net.

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Interest rate swap agreements used for interest rate risk management.

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Amount before allowance of consumer installment revolving and home equity loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts.

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Other credit-related commitments.

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Other financial instruments.

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Amount of domestic interest-bearing checking and savings accounts, which may include money market accounts, NOW accounts, interest-bearing corporate checking accounts, brokered deposits and other savings accounts.

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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The amount outstanding of funds lent to other depository institutions, securities brokers, or securities dealers in the form of Federal Funds sold; for example, immediately available funds lent under agreements or contracts that mature in one business day or roll over under a continuing contract, regardless of the nature of the transaction or the collateral involved, excluding overnight lending for commercial and industrial purposes. Also include Federal Funds sold under agreements to resell on a gross basis, excluding (1) sales of term Federal Funds, (2) due bills representing purchases of securities or other assets by the reporting bank that have not yet been delivered and similar instruments, (3) resale agreements that mature in more than one business day involving assets other than securities, and (4) yield maintenance dollar repurchase agreements.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Interest-bearing deposits at banks	$ 23,663,810	$ 7,190,154
Federal funds sold		3,500
Investment securities	7,045,697	9,497,251
Loans and leases:
Loans and leases	98,875,788	91,188,525
Allowance for credit losses	(1,736,387)	(1,051,071)	$ (1,019,444)	$ (1,017,198)
Loans and leases, net	96,799,480	89,871,798
Financial liabilities:
Noninterest-bearing deposits	(47,572,884)	(32,396,407)
Savings and interest-checking deposits	(67,680,840)	(54,932,162)
Time deposits	(3,899,910)	(5,757,456)
Deposits at Cayman Islands office	(652,104)	(1,684,044)
Long-term borrowings	(4,382,193)	(6,986,186)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,552,743	1,432,805
Interest-bearing deposits at banks	23,663,810	7,190,154
Federal funds sold		3,500
Trading account assets	1,068,581	470,129
Investment securities	7,045,697	9,497,251
Loans and leases:
Consumer loans	16,570,421	15,386,693
Allowance for credit losses	(1,736,387)	(1,051,071)
Loans and leases, net	96,799,480	89,871,798
Accrued interest receivable	419,936	333,142
Financial liabilities:
Noninterest-bearing deposits	(47,572,884)	(32,396,407)
Savings and interest-checking deposits	(67,680,840)	(54,932,162)
Time deposits	(3,899,910)	(5,757,456)
Deposits at Cayman Islands office	(652,104)	(1,684,044)
Short-term borrowings	(59,482)	(62,363)
Long-term borrowings	(4,382,193)	(6,986,186)
Accrued interest payable	(59,916)	(105,374)
Trading account liabilities	(116,902)	(79,903)
Other financial instruments:
Commitments to originate real estate loans for sale	43,234	10,740
Commitments to sell real estate loans	(18,429)	300
Other credit-related commitments	(133,354)	(136,470)
Interest rate swap agreements used for interest rate risk management	1,076	(1,762)
Estimate Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,552,743	1,432,805
Interest-bearing deposits at banks	23,663,810	7,190,154
Federal funds sold		3,500
Trading account assets	1,068,581	470,129
Investment securities	7,138,989	9,539,540
Loans and leases:
Consumer loans	16,554,050	15,413,262
Loans and leases, net	97,680,470	90,668,624
Accrued interest receivable	419,936	333,142
Financial liabilities:
Noninterest-bearing deposits	(47,572,884)	(32,396,407)
Savings and interest-checking deposits	(67,680,840)	(54,932,162)
Time deposits	(3,919,367)	(5,829,347)
Deposits at Cayman Islands office	(652,104)	(1,684,044)
Short-term borrowings	(59,482)	(62,363)
Long-term borrowings	(4,490,433)	(7,063,165)
Accrued interest payable	(59,916)	(105,374)
Trading account liabilities	(116,902)	(79,903)
Other financial instruments:
Commitments to originate real estate loans for sale	43,234	10,740
Commitments to sell real estate loans	(18,429)	300
Other credit-related commitments	(133,354)	(136,470)
Interest rate swap agreements used for interest rate risk management	1,076	(1,762)
Estimate Fair Value [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,497,457	1,394,984
Trading account assets	50,060	49,040
Investment securities	63,129	100,637
Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	55,286	37,821
Interest-bearing deposits at banks	23,663,810	7,190,154
Federal funds sold		3,500
Trading account assets	1,018,521	421,089
Investment securities	7,005,571	9,351,793
Loans and leases:
Loans and leases, net	4,413,566	4,019,186
Accrued interest receivable	419,936	333,142
Financial liabilities:
Noninterest-bearing deposits	(47,572,884)	(32,396,407)
Savings and interest-checking deposits	(67,680,840)	(54,932,162)
Time deposits	(3,919,367)	(5,829,347)
Deposits at Cayman Islands office	(652,104)	(1,684,044)
Short-term borrowings	(59,482)	(62,363)
Long-term borrowings	(4,490,433)	(7,063,165)
Accrued interest payable	(59,916)	(105,374)
Trading account liabilities	(116,902)	(79,903)
Other financial instruments:
Commitments to sell real estate loans	(18,429)	300
Interest rate swap agreements used for interest rate risk management	1,076	(1,762)
Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	70,289	87,110
Loans and leases:
Consumer loans	16,554,050	15,413,262
Loans and leases, net	93,266,904	86,649,438
Other financial instruments:
Commitments to originate real estate loans for sale	43,234	10,740
Other credit-related commitments	(133,354)	(136,470)
Commercial Loans and Leases [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases	27,574,564	23,838,168
Commercial Loans and Leases [Member] \| Estimate Fair Value [Member]
Loans and leases:
Loans and leases	27,220,699	23,510,908
Commercial Loans and Leases [Member] \| Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	27,220,699	23,510,908
Commercial [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases	37,637,889	35,541,914
Commercial [Member] \| Estimate Fair Value [Member]
Loans and leases:
Loans and leases	36,816,580	35,517,180
Commercial [Member] \| Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	277,911	28,338
Commercial [Member] \| Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	36,538,669	35,488,842
Residential Real Estate Loans \| Carrying Amount [Member]
Loans and leases:
Loans and leases	16,752,993	16,156,094
Residential Real Estate Loans \| Estimate Fair Value [Member]
Loans and leases:
Loans and leases	17,089,141	16,227,274
Residential Real Estate Loans \| Estimate Fair Value [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	4,135,655	3,990,848
Residential Real Estate Loans \| Estimate Fair Value [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	$ 12,953,486	$ 12,236,426