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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Held to Maturity (Detail)
$ in Thousands
Jun. 30, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 1,584 70
Less than 12 months, Fair Value $ 4,641,195 $ 903,040
Less than 12 months,Unrealized Losses $ (414,382) $ (14,925)
12 months or more, Count | Security 44 28
12 months or more, Fair Value $ 357,949 $ 217,579
12 months or more, Unrealized Losses $ (50,516) $ (26,460)
Total Count | Security 1,628 98
Total Fair Value $ 4,999,144 $ 1,120,619
Total Unrealized Losses $ (464,898) $ (41,385)
U.S. Agencies [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 11  
Less than 12 months, Fair Value $ 121,856  
Less than 12 months,Unrealized Losses $ (1,177)  
Total Count | Security 11  
Total Fair Value $ 121,856  
Total Unrealized Losses $ (1,177)  
Mortgage-backed [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 252 12
Less than 12 months, Fair Value $ 2,843,277 $ 317,887
Less than 12 months,Unrealized Losses $ (212,959) $ (2,431)
Total Count | Security 252 12
Total Fair Value $ 2,843,277 $ 317,887
Total Unrealized Losses $ (212,959) $ (2,431)
State and political subdivisions [Member]    
Schedule Of Held To Maturity Securities [Line Items]    
Less than 12 months, Count | Security 1,321 58
Less than 12 months, Fair Value $ 1,676,062 $ 585,153
Less than 12 months,Unrealized Losses $ (200,246) $ (12,494)
12 months or more, Count | Security 44 28
12 months or more, Fair Value $ 357,949 $ 217,579
12 months or more, Unrealized Losses $ (50,516) $ (26,460)
Total Count | Security 1,365 86
Total Fair Value $ 2,034,011 $ 802,732
Total Unrealized Losses $ (250,762) $ (38,954)