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Fair Value Measurements - Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments $ 7,915,788 $ 9,441,175
Securities available for sale 13,660,886 13,709,141
Securities held to maturity (exclusive of allowance for credit losses) 5,703,238 5,724,227
Trading securities 24,205 22,331
Other securities 685,590 676,300
Loans (exclusive of allowance for credit losses) 40,138,796 38,781,438
Derivatives $ 266,599 $ 281,329
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Time deposits $ 3,210,518 $ 3,760,862
Other borrowings 3,550,738 3,324,938
Long-term debt 477,164 474,229
Derivatives $ 146,429 $ 136,452
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 $ 7,915,788 $ 9,441,175
Securities available for sale 13,660,886 13,709,141
Securities held to maturity (exclusive of allowance for credit losses) 5,172,564 5,250,465
Trading securities 24,205 22,331
Other securities 685,590 676,300
Loans (exclusive of allowance for credit losses) 40,652,688 39,041,201
Derivatives 266,599 281,329
Time deposits 3,210,518 3,760,862
Other borrowings 3,550,738 3,324,938
Long-term debt 526,828 523,545
Derivatives 146,429 136,452
Commitments to extend credit for loans 4,631 14,972
Commitments to extend resell agreements 104 106
Commercial letters of credit 16 130
Standby letters of credit 1,330 4,483
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 6,391,119 7,893,082
Securities available for sale 2,397,394 2,497,930
Trading securities 7,513 5,145
Other securities 12,604 14,690
Other borrowings 39,082 32,133
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 1,524,669 1,548,093
Securities available for sale 11,263,492 11,211,211
Securities held to maturity (exclusive of allowance for credit losses) 5,172,564 5,250,465
Trading securities 16,692 17,186
Other securities 672,986 661,610
Loans (exclusive of allowance for credit losses) 40,652,688 39,041,201
Derivatives 266,599 281,329
Time deposits 3,210,518 3,760,862
Other borrowings 3,511,656 3,292,805
Long-term debt 526,828 523,545
Derivatives $ 146,429 $ 136,452