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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 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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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 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 domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits.

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Amount, before allowance for credit loss, of financing receivable.

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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financial assets:
Interest-bearing deposits at banks	$ 33,864,824		$ 23,663,810
Investment securities	6,143,177		7,045,697
Loans and leases:
Allowance for credit losses	(1,575,128)	$ (1,636,206)	(1,736,387)	$ (1,638,236)	$ (1,384,366)	$ (1,051,071)
Loans and leases, net	95,538,304		96,799,480
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,155,600)		(3,899,910)
Deposits at Cayman Islands office			(652,104)
Long-term borrowings	(3,499,448)		(4,382,193)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,291,665		1,497,457
Trading account assets	49,544		50,060
Investment securities	71,917		63,129
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	118,803		55,286
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	663,014		1,018,521
Investment securities	6,073,252		7,005,571
Loans and leases:
Loans and leases, net	4,040,226		4,413,566
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,163,772)		(3,919,367)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,609,147)		(4,490,433)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to sell real estate loans	(2,471)		(18,429)
Interest rate swap agreements used for interest rate risk management	928		1,076
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	64,824		70,289
Loans and leases:
Consumer loans	17,541,515		16,554,050
Loans and leases, net	92,318,953		93,266,904
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Other credit-related commitments	(131,136)		(133,354)
Commercial Loans And Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	25,174,858		27,220,699
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	205,591		277,911
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	36,571,644		36,538,669
Residential Real Estate Loans [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	3,834,635		4,135,655
Residential Real Estate Loans [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	13,030,936		12,953,486
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,410,468		1,552,743
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	712,558		1,068,581
Investment securities	6,143,177		7,045,697
Loans and leases:
Consumer loans	17,440,415		16,570,421
Allowance for credit losses	(1,575,128)		(1,736,387)
Loans and leases, net	95,538,304		96,799,480
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,155,600)		(3,899,910)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,499,448)		(4,382,193)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Commitments to sell real estate loans	(2,471)		(18,429)
Other credit-related commitments	(131,136)		(133,354)
Interest rate swap agreements used for interest rate risk management	928		1,076
Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	25,409,291		27,574,564
Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	37,558,775		37,637,889
Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	16,704,951		16,752,993
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,410,468		1,552,743
Interest-bearing deposits at banks	33,864,824		23,663,810
Trading account assets	712,558		1,068,581
Investment securities	6,209,993		7,138,989
Loans and leases:
Consumer loans	17,541,515		16,554,050
Loans and leases, net	96,359,179		97,680,470
Accrued interest receivable	409,745		419,936
Financial liabilities:
Noninterest-bearing deposits	(55,621,230)		(47,572,884)
Savings and interest-checking deposits	(69,491,942)		(67,680,840)
Time deposits	(3,163,772)		(3,919,367)
Deposits at Cayman Islands office			(652,104)
Short-term borrowings	(91,235)		(59,482)
Long-term borrowings	(3,609,147)		(4,490,433)
Accrued interest payable	(48,677)		(59,916)
Trading account liabilities	(101,271)		(116,902)
Other financial instruments:
Commitments to originate real estate loans for sale	35,666		43,234
Commitments to sell real estate loans	(2,471)		(18,429)
Other credit-related commitments	(131,136)		(133,354)
Interest rate swap agreements used for interest rate risk management	928		1,076
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	25,174,858		27,220,699
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	36,777,235		36,816,580
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	$ 16,865,571		$ 17,089,141