Commitments to originate real estate loans for sale.

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Commitments to sell real estate loans net.

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Federal funds sold and agreements to resell securities.

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Interest rate and foreign exchange contracts not designated as hedging instruments

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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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Amount of interest payable on debt, including, but not limited to, trade payables.

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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, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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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 of time deposit liabilities, including certificates of deposit.

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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financial assets:
Interest-bearing deposits at banks	$ 33,437,454		$ 41,872,304
Federal Funds Sold and Agreements to Resell Securities	250,250
Investment securities	22,801,717		7,155,860
Loans and leases:
Commercial loans and leases	128,685,278		93,136,678
Allowance for credit losses	(1,823,790)	$ (1,472,359)	(1,469,226)	$ (1,575,128)	$ (1,636,206)	$ (1,736,387)
Loans and leases, net	126,662,330		91,443,226
Financial liabilities:
Noninterest-bearing deposits	(72,375,515)		(60,131,480)
Savings and interest-checking deposits	(92,711,597)		(68,603,966)
Time deposits	(5,271,284)		(2,807,963)
Long-term borrowings	(3,017,363)		(3,485,369)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,535,535		1,205,269
Trading account	133,855		49,545
Investment securities	91,820		68,850
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	152,739		132,308
Interest-bearing deposits at banks	33,437,454		41,872,304
Federal Funds Sold and Agreements to Resell Securities	250,250
Trading account			200
Investment securities	21,977,313		7,066,293
Loans and leases:
Loans and leases, net	11,641,687		4,949,028
Accrued interest receivable	475,776		335,162
Financial liabilities:
Noninterest-bearing deposits	(72,375,515)		(60,131,480)
Savings and interest-checking deposits	92,711,597		(68,603,966)
Time deposits	(5,270,713)		(2,810,143)
Short-term borrowings	(1,119,321)		(47,046)
Long-term borrowings	(2,992,593)		(3,562,223)
Accrued interest payable	(44,471)		(40,866)
Other financial instruments:
Commitments to sell real estate loans	47,471		7,525
Interest rate swap agreements used for interest rate risk management	41,417		(207)
Interest rate and foreign exchange contracts not designated as hedging instruments	(629,382)		334,852
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	55,528		57,333
Loans and leases:
Consumer loans	19,630,170		18,121,363
Loans and leases, net	113,857,546		87,348,549
Other financial instruments:
Commitments to originate real estate loans for sale	(24,181)		6,440
Other credit-related commitments	128,344		(123,032)
Commercial Loans And Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	38,785,142		23,285,224
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	254,822		425,010
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	45,249,919		34,305,181
Residential Real Estate Loans [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Commercial loans and leases	11,386,865		4,524,018
Residential Real Estate Loans [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Commercial loans and leases	10,192,315		11,636,781
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,688,274		1,337,577
Interest-bearing deposits at banks	33,437,454		41,872,304
Federal Funds Sold and Agreements to Resell Securities	250,250
Trading account	133,855		49,745
Investment securities	22,801,717		7,155,860
Loans and leases:
Consumer loans	19,815,198		17,974,953
Allowance for credit losses	1,823,790		(1,469,226)
Loans and leases, net	126,662,330		91,443,226
Accrued interest receivable	475,776		335,162
Financial liabilities:
Noninterest-bearing deposits	(72,375,515)		(60,131,480)
Savings and interest-checking deposits	92,711,597		(68,603,966)
Time deposits	(5,271,284)		(2,807,963)
Short-term borrowings	(1,119,321)		(47,046)
Long-term borrowings	(3,017,363)		(3,485,369)
Accrued interest payable	(44,471)		(40,866)
Other financial instruments:
Commitments to originate real estate loans for sale	(24,181)		6,440
Commitments to sell real estate loans	47,471		7,525
Other credit-related commitments	128,344		(123,032)
Interest rate swap agreements used for interest rate risk management	41,417		(207)
Interest rate and foreign exchange contracts not designated as hedging instruments	(629,382)		334,852
Carrying Amount [Member] \| Commercial Loans And Leases [Member]
Loans and leases:
Commercial loans and leases	39,108,676		23,473,324
Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	46,795,139		35,389,730
Carrying Amount [Member] \| Residential Real Estate Loans [Member]
Loans and leases:
Commercial loans and leases	22,767,107		16,074,445
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,688,274		1,337,577
Interest-bearing deposits at banks	33,437,454		41,872,304
Federal Funds Sold and Agreements to Resell Securities	250,250
Trading account	133,855		49,745
Investment securities	22,124,661		7,192,476
Loans and leases:
Consumer loans	19,630,170		18,121,363
Loans and leases, net	125,499,233		92,297,577
Accrued interest receivable	475,776		335,162
Financial liabilities:
Noninterest-bearing deposits	(72,375,515)		(60,131,480)
Savings and interest-checking deposits	92,711,597		(68,603,966)
Time deposits	(5,270,713)		(2,810,143)
Short-term borrowings	(1,119,321)		(47,046)
Long-term borrowings	(2,992,593)		(3,562,223)
Accrued interest payable	(44,471)		(40,866)
Other financial instruments:
Commitments to originate real estate loans for sale	(24,181)		6,440
Commitments to sell real estate loans	47,471		7,525
Other credit-related commitments	128,344		(123,032)
Interest rate swap agreements used for interest rate risk management	41,417		(207)
Interest rate and foreign exchange contracts not designated as hedging instruments	(629,382)		334,852
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	38,785,142		23,285,224
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member] \| Commercial [Member]
Loans and leases:
Commercial loans and leases	45,504,741		34,730,191
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	$ 21,579,180		$ 16,160,799