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Securities - Amortized Cost and Estimated Fair Value of Securities, Excluding Trading Securities, Presented by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Held to Maturity, Due in one year or less, Amortized Cost $ 5,172  
Held to Maturity, Due after one year through five years, Amortized Cost 528,976  
Held to Maturity, Due after five years through ten years, Amortized Cost 80,924  
Held to Maturity, Due after ten years, Amortized Cost 2,896,394  
Held to Maturity, Amortized Cost 3,511,466 $ 3,534,085
Held to Maturity, Due in one year or less, Estimated Fair Value 5,175  
Held to Maturity, Due after one year through five years, Estimated Fair Value 488,449  
Held to Maturity, Due after five years through ten years, Estimated Fair Value 75,995  
Held to Maturity, Due after ten years, Estimated Fair Value 2,727,631  
Held to Maturity, Estimated Fair Value 3,297,250 3,360,546
Available-for-sale Securities, Due in one year or less, Amortized Cost 1,370,865  
Available for Sale, Due after one year through five years, Amortized Cost 2,342,560  
Available for Sale, Due after five years through ten years, Amortized Cost 984,524  
Available for Sale, Due after ten years, Amortized Cost 13,526,137  
Debt Securities, Available-for-sale, Amortized Cost 18,267,359 16,602,158
Available for Sale, Due in one year or less, Estimated Fair Value 1,365,385  
Available for Sale, Due after one year through five years, Estimated Fair Value 2,220,716  
Available for Sale, Due after five years through ten years, Estimated Fair Value 915,605  
Available for Sale, Due after ten years, Estimated Fair Value 12,319,493  
Securities available for sale, at estimated fair value 16,864,472 15,043,625
US Treasury Securities [Member]    
Schedule of Investments [Line Items]    
Available-for-sale Securities, Due in one year or less, Amortized Cost 1,247,261  
Available for Sale, Due after one year through five years, Amortized Cost 2,057,337  
Available for Sale, Due after five years through ten years, Amortized Cost 198,178  
Available for Sale, Due after ten years, Amortized Cost 192,878  
Debt Securities, Available-for-sale, Amortized Cost 3,695,654 3,692,215
Available for Sale, Due in one year or less, Estimated Fair Value 1,241,789  
Available for Sale, Due after one year through five years, Estimated Fair Value 1,939,695  
Available for Sale, Due after five years through ten years, Estimated Fair Value 169,938  
Available for Sale, Due after ten years, Estimated Fair Value 139,773  
Securities available for sale, at estimated fair value 3,491,195 3,442,320
Residential Mortgage Backed Securities [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Due in one year or less, Amortized Cost 0  
Held to Maturity, Due after one year through five years, Amortized Cost 509,970  
Held to Maturity, Due after five years through ten years, Amortized Cost 11,238  
Held to Maturity, Due after ten years, Amortized Cost 658,905  
Held to Maturity, Amortized Cost 1,180,113 1,193,840
Held to Maturity, Due in one year or less, Estimated Fair Value 0  
Held to Maturity, Due after one year through five years, Estimated Fair Value 469,308  
Held to Maturity, Due after five years through ten years, Estimated Fair Value 9,451  
Held to Maturity, Due after ten years, Estimated Fair Value 650,193  
Held to Maturity, Estimated Fair Value 1,128,952 1,122,764
Available-for-sale Securities, Due in one year or less, Amortized Cost 0  
Available for Sale, Due after one year through five years, Amortized Cost 745  
Available for Sale, Due after five years through ten years, Amortized Cost 12,116  
Available for Sale, Due after ten years, Amortized Cost 9,564,462  
Debt Securities, Available-for-sale, Amortized Cost 9,577,323 8,024,704
Available for Sale, Due in one year or less, Estimated Fair Value 0  
Available for Sale, Due after one year through five years, Estimated Fair Value 756  
Available for Sale, Due after five years through ten years, Estimated Fair Value 12,162  
Available for Sale, Due after ten years, Estimated Fair Value 8,678,029  
Securities available for sale, at estimated fair value 8,690,947 6,997,902
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Due in one year or less, Amortized Cost 5,172  
Held to Maturity, Due after one year through five years, Amortized Cost 17,506  
Held to Maturity, Due after five years through ten years, Amortized Cost 69,686  
Held to Maturity, Due after ten years, Amortized Cost 2,237,489  
Held to Maturity, Amortized Cost 2,329,853 2,338,745
Held to Maturity, Due in one year or less, Estimated Fair Value 5,175  
Held to Maturity, Due after one year through five years, Estimated Fair Value 17,641  
Held to Maturity, Due after five years through ten years, Estimated Fair Value 66,544  
Held to Maturity, Due after ten years, Estimated Fair Value 2,077,438  
Held to Maturity, Estimated Fair Value 2,166,798 2,236,285
Available-for-sale Securities, Due in one year or less, Amortized Cost 123,604  
Available for Sale, Due after one year through five years, Amortized Cost 284,478  
Available for Sale, Due after five years through ten years, Amortized Cost 774,230  
Available for Sale, Due after ten years, Amortized Cost 3,768,797  
Debt Securities, Available-for-sale, Amortized Cost 4,951,109 4,842,060
Available for Sale, Due in one year or less, Estimated Fair Value 123,596  
Available for Sale, Due after one year through five years, Estimated Fair Value 280,265  
Available for Sale, Due after five years through ten years, Estimated Fair Value 733,505  
Available for Sale, Due after ten years, Estimated Fair Value 3,501,691  
Securities available for sale, at estimated fair value 4,639,057 4,560,224
Other Investments [Member]    
Schedule of Investments [Line Items]    
Held to Maturity, Due in one year or less, Amortized Cost 0  
Held to Maturity, Due after one year through five years, Amortized Cost 1,500  
Held to Maturity, Due after five years through ten years, Amortized Cost 0  
Held to Maturity, Due after ten years, Amortized Cost 0  
Held to Maturity, Amortized Cost 1,500 1,500
Held to Maturity, Due in one year or less, Estimated Fair Value 0  
Held to Maturity, Due after one year through five years, Estimated Fair Value 1,500  
Held to Maturity, Due after five years through ten years, Estimated Fair Value 0  
Held to Maturity, Due after ten years, Estimated Fair Value 0  
Held to Maturity, Estimated Fair Value 1,500 1,497
Available-for-sale Securities, Due in one year or less, Amortized Cost 0  
Available for Sale, Due after one year through five years, Amortized Cost 0  
Available for Sale, Due after five years through ten years, Amortized Cost 0  
Available for Sale, Due after ten years, Amortized Cost 0  
Debt Securities, Available-for-sale, Amortized Cost 43,273 43,179
Available for Sale, Due in one year or less, Estimated Fair Value 0  
Available for Sale, Due after one year through five years, Estimated Fair Value 0  
Available for Sale, Due after five years through ten years, Estimated Fair Value 0  
Available for Sale, Due after ten years, Estimated Fair Value 0  
Securities available for sale, at estimated fair value $ 43,273 $ 43,179