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Fair Value Measurements - Summary of Estimated Fair Values of Significant Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity investment securities, Fair Value $ 7,168,583 $ 7,453,123
Carrying Amount | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,449,525 2,074,434
Held-to-maturity investment securities, Carrying Amount 7,969,575 8,444,191
Loans and leases, net 55,877,699 51,815,602
Securities sold under agreements to repurchase and federal funds purchased 596,738 344,168
FHLB advances 2,980,718 2,110,108
Long-term debt 739,454 909,185
Carrying Amount | Fair Value, Nonrecurring | Deposit liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 60,189,495 56,518,126
Carrying Amount | Fair Value, Nonrecurring | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 8,570,318 8,234,954
Level 1 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,449,525 2,074,434
Level 2 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity investment securities, Fair Value 7,168,583 7,453,123
Securities sold under agreements to repurchase and federal funds purchased 596,872 344,166
FHLB advances 2,978,201 2,107,790
Long-term debt 791,945 860,200
Level 2 | Fair Value | Fair Value, Nonrecurring | Deposit liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 60,189,495 56,518,126
Level 2 | Fair Value | Fair Value, Nonrecurring | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 8,553,998 8,211,582
Level 3 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and leases, net $ 54,892,526 $ 50,245,305