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Derivative Financial Instruments - Schedule of Notional Amounts and Fair Values (Detail) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Notional Amounts    
Asset Derivatives, Notional Amounts $ 14,905,267,000 $ 9,781,447,000
Liability Derivatives, Notional Amounts 11,503,781,000 13,812,216,000
Asset Derivatives    
Asset Derivatives, Fair Value 153,854,000 283,185,000
Gross derivative instruments, before netting 230,201,000 302,142,000
Gross Amounts Offset in the Statement of Financial Position 65,063,000 31,881,000
Cash collateral pledged 84,056,000 251,212,000
Total derivative instruments, after netting 81,082,000 19,049,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 77,167,000 32,218,000
Gross derivative instruments, before netting 223,714,000 311,561,000
Gross Amounts Offset in the Statement of Financial Position 65,063,000 31,881,000
Cash collateral pledged 12,053,000 80,000
Derivative Liability $ 146,598,000 $ 279,600,000
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag true true
CME    
Asset Derivatives    
Total derivative instruments, after netting $ 0 $ 0
Cross Currency Interest Rate Contract    
Notional Amounts    
Asset Derivatives, Notional Amounts 370,100,000 294,500,000
Liability Derivatives, Notional Amounts 965,400,000 796,600,000
Designated as Hedging Instrument | Interest rate derivatives    
Notional Amounts    
Asset Derivatives, Notional Amounts 4,500,000,000 750,000,000
Liability Derivatives, Notional Amounts 500,000,000 4,250,000,000
Asset Derivatives    
Asset Derivatives, Fair Value 6,258,000 719,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 403,000 13,169,000
Not Designated as Hedging Instrument    
Notional Amounts    
Asset Derivatives, Notional Amounts 10,405,267,000 9,031,447,000
Liability Derivatives, Notional Amounts 11,003,781,000 9,562,216,000
Asset Derivatives    
Asset Derivatives, Fair Value 223,943,000 301,423,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 223,311,000 298,392,000
Not Designated as Hedging Instrument | Interest rate derivatives    
Notional Amounts    
Asset Derivatives, Notional Amounts 9,989,160,000 8,693,493,000
Liability Derivatives, Notional Amounts 9,989,160,000 8,728,767,000
Asset Derivatives    
Asset Derivatives, Fair Value 223,685,000 300,120,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 222,794,000 298,296,000
Not Designated as Hedging Instrument | Mortgage banking derivatives    
Notional Amounts    
Asset Derivatives, Notional Amounts 4,032,000 584,000
Liability Derivatives, Notional Amounts 0 0
Asset Derivatives    
Asset Derivatives, Fair Value 67,000 3,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 0 0
Not Designated as Hedging Instrument | Other    
Notional Amounts    
Asset Derivatives, Notional Amounts 412,075,000 337,370,000
Liability Derivatives, Notional Amounts 1,014,621,000 833,449,000
Asset Derivatives    
Asset Derivatives, Fair Value 191,000 1,300,000
Liability Derivatives    
Gross Amounts of Recognized Assets/Liabilities 517,000 96,000
Not Designated as Hedging Instrument | CME Swaps Markets    
Notional Amounts    
Asset Derivatives, Notional Amounts 65,300,000 71,100,000
Liability Derivatives, Notional Amounts 126,500,000 126,500,000
Not Designated as Hedging Instrument | Interest Rate Swap    
Liability Derivatives    
Fair value of settled-to-market derivatives $ 0 $ 0