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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments $ 9,730,510 $ 9,104,445
Securities available for sale 13,378,280 7,774,334
Securities held to maturity (exclusive of allowance for credit losses) 5,654,232 5,378,912
Trading securities 35,811 28,533
Other securities 719,575 471,018
Loans (exclusive of allowance for credit losses) 37,709,677 25,645,057
Derivatives $ 299,164 $ 234,443
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Demand and savings deposits $ 56,737,950 $ 41,014,362
Time deposits 3,397,893 2,127,667
Other borrowings 2,838,597 2,609,715
Long-term debt 471,331 385,292
Derivatives $ 144,029 $ 107,442
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments $ 9,730,510 $ 9,104,445
Securities available for sale 13,378,280 7,774,334
Securities held to maturity (exclusive of allowance for credit losses) 5,119,701 4,748,938
Trading securities 35,811 28,533
Other securities 719,575 471,018
Loans (exclusive of allowance for credit losses) 37,996,031 25,665,211
Derivatives 299,164 234,443
Demand and savings deposits 56,737,950 41,014,362
Time deposits 3,404,797 2,127,667
Other borrowings 2,838,597 2,609,715
Long-term debt 527,524 417,217
Derivatives 144,029 107,442
Commitments to extend credit for loans 10,340 12,515
Commitments to extend resell agreements 57 292
Commercial letters of credit 116 135
Standby letters of credit 3,430 4,375
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 8,965,397 8,559,445
Securities available for sale 2,420,287 1,643,243
Trading securities 11,825 8,695
Other securities 41,150 11,596
Demand and savings deposits 56,737,950 41,014,362
Other borrowings 72,502 70,405
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 765,113 545,000
Securities available for sale 10,957,993 6,131,091
Securities held to maturity (exclusive of allowance for credit losses) 5,119,701 4,748,938
Trading securities 23,986 19,838
Other securities 678,425 459,422
Loans (exclusive of allowance for credit losses) 37,996,031 25,665,211
Derivatives 299,164 234,443
Time deposits 3,404,797 2,127,667
Other borrowings 2,766,095 2,539,310
Long-term debt 527,524 417,217
Derivatives $ 144,029 $ 107,442