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Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Financial assets:            
Interest-bearing deposits at banks $ 27,106,899   $ 24,958,719      
Federal funds sold     3,000      
Investment securities 27,916,455   25,210,871      
Loans and leases:            
Loans and leases 134,061,568   132,074,156      
Allowance for credit losses (1,998,366) $ (1,975,110) (1,925,331) $ (1,823,790) $ (1,472,359) $ (1,469,226)
Loans and leases, net 131,345,363   129,638,832      
Financial liabilities:            
Noninterest-bearing deposits (54,937,913)   (65,501,860)      
Savings and interest-checking deposits (88,046,247)   (87,911,463)      
Time deposits (19,074,220)   (10,101,545)      
Long-term borrowings (7,416,638)   (3,964,537)      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
Financial assets:            
Cash and cash equivalents 1,780,005   1,371,688      
Trading account 137,240   117,847      
Investment securities 211,341   145,289      
Significant Observable Inputs (Level 2) [Member]            
Financial assets:            
Cash and cash equivalents 68,381   145,556      
Interest-bearing deposits at banks 27,106,899   24,958,719      
Federal funds sold     3,000      
Investment securities 26,451,387   23,860,445      
Loans and leases:            
Loans and leases, net 7,578,943   7,180,192      
Accrued interest receivable 695,030   646,250      
Financial liabilities:            
Noninterest-bearing deposits (54,937,913)   (65,501,860)      
Savings and interest-checking deposits (88,046,247)   (87,911,463)      
Time deposits (18,968,171)   (10,143,110)      
Short-term borrowings (7,907,884)   (3,554,951)      
Long-term borrowings (7,091,668)   (3,926,489)      
Accrued interest payable (389,251)   (81,356)      
Other financial instruments:            
Commitments to sell real estate loans 54,533   54,424      
Interest rate swap agreements used for interest rate risk management 2,133   (7,892)      
Interest rate and foreign exchange contracts not designated as hedging instruments (940,230)   (920,316)      
Significant Unobservable Inputs (Level 3) [Member]            
Financial assets:            
Investment securities 49,117   50,588      
Loans and leases:            
Consumer loans 19,335,779   20,093,523      
Loans and leases, net 119,761,668   119,048,176      
Other financial instruments:            
Commitments to originate real estate loans for sale (37,178)   (45,573)      
Other credit-related commitments (155,903)   (148,772)      
Carrying Amount [Member]            
Financial assets:            
Cash and cash equivalents 1,848,386   1,517,244      
Interest-bearing deposits at banks 27,106,899   24,958,719      
Federal funds sold     3,000      
Trading account 137,240   117,847      
Investment securities 27,916,455   25,210,871      
Loans and leases:            
Consumer loans 20,249,252   20,593,079      
Allowance for credit losses (1,998,366)   (1,925,331)      
Loans and leases, net 131,345,363   129,638,832      
Accrued interest receivable 695,030   646,250      
Financial liabilities:            
Noninterest-bearing deposits (54,937,913)   (65,501,860)      
Savings and interest-checking deposits (88,046,247)   (87,911,463)      
Time deposits (19,074,220)   (10,101,545)      
Short-term borrowings (7,907,884)   (3,554,951)      
Long-term borrowings (7,416,638)   (3,964,537)      
Accrued interest payable (389,251)   (81,356)      
Other financial instruments:            
Commitments to originate real estate loans for sale (37,178)   (45,573)      
Commitments to sell real estate loans 54,533   54,424      
Other credit-related commitments (155,903)   (148,772)      
Interest rate swap agreements used for interest rate risk management 2,133   (7,892)      
Interest rate and foreign exchange contracts not designated as hedging instruments (940,230)   (920,316)      
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]            
Financial assets:            
Cash and cash equivalents 1,848,386   1,517,244      
Interest-bearing deposits at banks 27,106,899   24,958,719      
Federal funds sold     3,000      
Trading account 137,240   117,847      
Investment securities 26,711,845   24,056,322      
Loans and leases:            
Consumer loans 19,335,779   20,093,523      
Loans and leases, net 127,340,611   126,228,368      
Accrued interest receivable 695,030   646,250      
Financial liabilities:            
Noninterest-bearing deposits (54,937,913)   (65,501,860)      
Savings and interest-checking deposits (88,046,247)   (87,911,463)      
Time deposits (18,968,171)   (10,143,110)      
Short-term borrowings (7,907,884)   (3,554,951)      
Long-term borrowings (7,091,668)   (3,926,489)      
Accrued interest payable (389,251)   (81,356)      
Other financial instruments:            
Commitments to originate real estate loans for sale (37,178)   (45,573)      
Commitments to sell real estate loans 54,533   54,424      
Other credit-related commitments (155,903)   (148,772)      
Interest rate swap agreements used for interest rate risk management 2,133   (7,892)      
Interest rate and foreign exchange contracts not designated as hedging instruments (940,230)   (920,316)      
Commercial Loans and Leases [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Loans and leases:            
Loans and leases 43,817,470   41,139,985      
Commercial Loans and Leases [Member] | Carrying Amount [Member]            
Loans and leases:            
Loans and leases 44,683,549   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 43,817,470   41,139,985      
Commercial [Member] | Significant Observable Inputs (Level 2) [Member]            
Loans and leases:            
Loans and leases 322,029   130,652      
Commercial [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Loans and leases:            
Loans and leases 42,064,780   43,083,994      
Commercial [Member] | Carrying Amount [Member]            
Loans and leases:            
Loans and leases 44,648,711   45,364,571      
Commercial [Member] | Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]            
Loans and leases:            
Loans and leases 42,386,809   43,214,646      
Residential Real Estate Loans | Significant Observable Inputs (Level 2) [Member]            
Loans and leases:            
Loans and leases 7,256,914   7,049,540      
Residential Real Estate Loans | Significant Unobservable Inputs (Level 3) [Member]            
Loans and leases:            
Loans and leases 14,543,639   14,730,674      
Residential Real Estate Loans | Carrying Amount [Member]            
Loans and leases:            
Loans and leases 23,762,217   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 $ 21,800,553   $ 21,780,214