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Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months $ 555,157 $ 9,670,043
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 22,335 377,333
Estimated fair value, 12 months or more 10,031,278 943,530
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 424,376 67,373
Held to maturity, Estimated fair value, Less than 12 months 3,872,293 10,559,073
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 260,717 885,190
Held to maturity, Estimated fair value, 12 months or more 9,877,015 1,354,961
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 1,554,501 279,647
Total investment securities, fair value less than 12 months 4,427,450 20,229,116
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses 283,052 1,262,523
Total of investment securities, fair value, 12 Months or More 19,908,293 2,298,491
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses 1,978,877 347,020
U.S. Treasury and Federal Agencies [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 226,045 6,706,413
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 3,741 183,760
Estimated fair value, 12 months or more 7,509,062 841,945
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 196,810 59,412
Held to maturity, Estimated fair value, Less than 12 months 48,825 1,008,288
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 1,193 45,747
Held to maturity, Estimated fair value, 12 months or more 904,460  
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 47,513  
Commercial [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 81,949 574,299
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 5,146 20,480
Estimated fair value, 12 months or more 443,520  
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 13,648  
Held to maturity, Estimated fair value, Less than 12 months 1,015,480 808,903
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 97,998 103,528
Held to maturity, Estimated fair value, 12 months or more 782,997  
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 135,057  
Residential [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 240,610 2,295,873
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 13,246 169,489
Estimated fair value, 12 months or more 1,926,504 28,305
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 201,285 1,792
Held to maturity, Estimated fair value, Less than 12 months 2,570,788 6,292,462
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 146,021 619,403
Held to maturity, Estimated fair value, 12 months or more 6,102,160 1,319,300
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 1,160,913 271,660
Obligations of States and Political Subdivisions [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, Less than 12 months 235,273 2,449,420
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 15,423 116,512
Held to maturity, Estimated fair value, 12 months or more 2,055,317  
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses 203,726  
Other Debt Securities [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Estimated fair value, Less than 12 months 6,553 93,458
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses 202 3,604
Estimated fair value, 12 months or more 152,192 73,280
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses 12,633 6,169
Privately Issued [Member]    
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]    
Held to maturity, Estimated fair value, Less than 12 months 1,927  
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses 82  
Held to maturity, Estimated fair value, 12 months or more 32,081 35,661
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses $ 7,292 $ 7,987