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Investment Securities - Summary of Debt Securities by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost    
Maturing within 1 year $ 6,017  
After 1 year through 5 years 225,321  
After 5 through 10 years 756,816  
After 10 years 8,953,223  
Amortized Cost - Total available-for-sale debt securities 9,941,377 $ 9,720,415
Fair Value    
Maturing within 1 year 6,006  
After 1 year through 5 years 221,780  
After 5 through 10 years 706,129  
After 10 years 8,426,182  
Fair Value, Total available-for-sale debt securities [1] $ 9,360,097 $ 9,006,600
[1] Investment securities available-for-sale had an amortized cost basis of $9,941,377 at March 31, 2025, and $9,720,415 at December 31, 2024.