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 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 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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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	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Interest-bearing deposits at banks	$ 22,306,425	$ 24,958,719
Federal funds sold		3,000
Investment securities	28,443,209	25,210,871
Loans and leases:
Loans and leases	133,531,052	132,074,156
Allowance for credit losses	(1,975,110)	(1,925,331)	$ (1,472,359)	$ (1,469,226)
Loans and leases, net	130,962,582	129,638,832
Financial liabilities:
Noninterest-bearing deposits	(59,955,033)	(65,501,860)
Savings and interest-checking deposits	(86,282,685)	(87,911,463)
Time deposits	(12,837,522)	(10,101,545)
Long-term borrowings	(7,462,890)	(3,964,537)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,742,645	1,371,688
Trading account	113,646	117,847
Investment securities	289,788	145,289
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	75,095	145,556
Interest-bearing deposits at banks	22,306,425	24,958,719
Federal funds sold		3,000
Trading account	51,570
Investment securities	27,105,863	23,860,445
Loans and leases:
Loans and leases, net	7,491,276	7,180,192
Accrued interest receivable	693,011	646,250
Financial liabilities:
Noninterest-bearing deposits	(59,955,033)	(65,501,860)
Savings and interest-checking deposits	(86,282,685)	(87,911,463)
Time deposits	(12,808,615)	(10,143,110)
Short-term borrowings	(6,995,302)	(3,554,951)
Long-term borrowings		(3,926,489)
Accrued interest payable	(182,906)	(81,356)
Other financial instruments:
Commitments to sell real estate loans	38,844	54,424
Interest rate swap agreements used for interest rate risk management	11,250	(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(722,949)	(920,316)
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	50,448	50,588
Loans and leases:
Consumer loans	19,514,964	20,093,523
Loans and leases, net	119,891,638	119,048,176
Financial liabilities:
Long-term borrowings	(7,070,243)
Other financial instruments:
Commitments to originate real estate loans for sale	(28,141)	(45,573)
Other credit-related commitments	(152,513)	(148,772)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,817,740	1,517,244
Interest-bearing deposits at banks	22,306,425	24,958,719
Federal funds sold		3,000
Trading account	165,216	117,847
Investment securities	28,443,209	25,210,871
Loans and leases:
Consumer loans	20,316,845	20,593,079
Allowance for credit losses	(1,975,110)	(1,925,331)
Loans and leases, net	130,962,582	129,638,832
Accrued interest receivable	693,011	646,250
Financial liabilities:
Noninterest-bearing deposits	(59,955,033)	(65,501,860)
Savings and interest-checking deposits	(86,282,685)	(87,911,463)
Time deposits	(12,837,522)	(10,101,545)
Short-term borrowings	(6,995,302)	(3,554,951)
Long-term borrowings	(7,462,890)	(3,964,537)
Accrued interest payable	(182,906)	(81,356)
Other financial instruments:
Commitments to originate real estate loans for sale	(28,141)	(45,573)
Commitments to sell real estate loans	38,844	54,424
Other credit-related commitments	(152,513)	(148,772)
Interest rate swap agreements used for interest rate risk management	11,250	(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(722,949)	(920,316)
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,817,740	1,517,244
Interest-bearing deposits at banks	22,306,425	24,958,719
Federal funds sold		3,000
Trading account	165,216	117,847
Investment securities	27,446,099	24,056,322
Loans and leases:
Consumer loans	19,514,964	20,093,523
Loans and leases, net	127,382,914	126,228,368
Accrued interest receivable	693,011	646,250
Financial liabilities:
Noninterest-bearing deposits	(59,955,033)	(65,501,860)
Savings and interest-checking deposits	(86,282,685)	(87,911,463)
Time deposits	(12,808,615)	(10,143,110)
Short-term borrowings	(6,995,302)	(3,554,951)
Long-term borrowings	(7,070,243)	(3,926,489)
Accrued interest payable	(182,906)	(81,356)
Other financial instruments:
Commitments to originate real estate loans for sale	(28,141)	(45,573)
Commitments to sell real estate loans	38,844	54,424
Other credit-related commitments	(152,513)	(148,772)
Interest rate swap agreements used for interest rate risk management	11,250	(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(722,949)	(920,316)
Commercial Loans and Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	42,992,625	41,139,985
Commercial Loans and Leases [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases	43,758,361	41,850,566
Commercial Loans and Leases [Member] \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	42,992,625	41,139,985
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	321,473,000	130,652
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	42,549,341	43,083,994
Commercial [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases		45,364,571
Consumer loans	45,072,541
Commercial [Member] \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	42,870,814	43,214,646
Residential Real Estate Loans \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	7,169,803	7,049,540
Residential Real Estate Loans \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	14,834,708	14,730,674
Residential Real Estate Loans \| Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	23,789,945
Loans and leases:
Loans and leases		23,755,947
Residential Real Estate Loans \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	$ 22,004,511	$ 21,780,214