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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail)
$ in Thousands
Sep. 30, 2025
USD ($)
Security
Dec. 31, 2024
USD ($)
Security
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 169 53
Less than 12 months, Fair Value $ 862,257 $ 55,995
Less than 12 months,Unrealized Losses $ (50,227) $ (2,133)
12 months or more, Count | Security 1,615 1,687
12 months or more, Fair Value $ 3,505,608 $ 4,189,802
12 months or more, Unrealized Losses $ (497,550) $ (639,876)
Total Count | Security 1,784 1,740
Total Fair Value $ 4,367,865 $ 4,245,797
Total Unrealized Losses $ (547,777) $ (642,009)
U.S. Treasury [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 6  
Less than 12 months, Fair Value $ 30,638  
Less than 12 months,Unrealized Losses $ (115)  
Total Count | Security 6  
Total Fair Value $ 30,638  
Total Unrealized Losses $ (115)  
U.S. Agencies [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
12 months or more, Count | Security   10
12 months or more, Fair Value   $ 115,750
12 months or more, Unrealized Losses   $ (581)
Total Count | Security   10
Total Fair Value   $ 115,750
Total Unrealized Losses   $ (581)
Mortgage-backed [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 12 6
Less than 12 months, Fair Value $ 104,013 $ 3,527
Less than 12 months,Unrealized Losses $ (1,198) $ (103)
12 months or more, Count | Security 262 263
12 months or more, Fair Value $ 2,037,057 $ 2,101,125
12 months or more, Unrealized Losses $ (322,126) $ (418,379)
Total Count | Security 274 269
Total Fair Value $ 2,141,070 $ 2,104,652
Total Unrealized Losses $ (323,324) $ (418,482)
State and political subdivisions [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 151 47
Less than 12 months, Fair Value $ 727,606 $ 52,468
Less than 12 months,Unrealized Losses $ (48,914) $ (2,030)
12 months or more, Count | Security 1,353 1,414
12 months or more, Fair Value $ 1,468,551 $ 1,972,927
12 months or more, Unrealized Losses $ (175,424) $ (220,916)
Total Count | Security 1,504 1,461
Total Fair Value $ 2,196,157 $ 2,025,395
Total Unrealized Losses $ (224,338) $ (222,946)