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Investment Securities - Summary of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Amortized Cost    
Maturing within 1 year $ 884  
After 1 year through 5 years 334,324  
After 5 through 10 years 702,943  
After 10 years 9,151,330  
Amortized Cost - Total available-for-sale debt securities 10,189,481 $ 9,720,415
Fair Value    
Maturing within 1 year 881  
After 1 year through 5 years 328,656  
After 5 through 10 years 660,919  
After 10 years 8,629,898  
Fair Value, Total available-for-sale debt securities [1] $ 9,620,354 $ 9,006,600
[1] Investment securities available-for-sale had an amortized cost basis of $10,189,481 at June 30, 2025, and $9,720,415 at December 31, 2024.