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Fair Value Measurements - Summary of Estimated Fair Values of Significant Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Held-to-maturity investment securities, Fair Value $ 7,453,123 $ 6,264,623    
Mortgage servicing assets, Carrying Amount 1,234 8,523 $ 9,515 $ 9,237
Carrying Amount | Fair Value, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 2,074,434 1,715,795    
Held-to-maturity investment securities, Carrying Amount 8,444,191 7,074,588    
Loans and leases, net 51,815,602 50,090,315    
Securities sold under agreements to repurchase and federal funds purchased 344,168 458,387    
FHLB advances 2,110,108 2,360,018    
Long-term debt 909,185 1,048,820    
Carrying Amount | Fair Value, Nonrecurring | Deposit liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 56,518,126 52,319,825    
Carrying Amount | Fair Value, Nonrecurring | Time deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 8,234,954 8,464,459    
Carrying Amount | Fair Value, Nonrecurring | Residential        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing assets, Carrying Amount 1,234 8,523    
Level 1 | Fair Value | Fair Value, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 2,074,434 1,715,795    
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 7,453,123 6,264,623    
Securities sold under agreements to repurchase and federal funds purchased 344,166 458,380    
FHLB advances 2,107,790 2,358,381    
Long-term debt 860,200 999,918    
Level 2 | Fair Value | Fair Value, Nonrecurring | Deposit liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 56,518,126 52,319,825    
Level 2 | Fair Value | Fair Value, Nonrecurring | Time deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Deposits 8,211,582 8,426,708    
Level 3 | Fair Value | Fair Value, Nonrecurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans and leases, net 50,245,305 48,048,106    
Level 3 | Fair Value | Fair Value, Nonrecurring | Residential        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Mortgage servicing rights, Fair Value $ 3,667 $ 24,495