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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Available for Sale (Detail)
$ in Thousands
Jun. 30, 2022
USD ($)
Security
Dec. 31, 2021
USD ($)
Security
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 3,074 858
Less than 12 months, Fair Value $ 6,718,217 $ 5,997,925
Less than 12 months, Unrealized Losses $ (496,997) $ (96,520)
12 months or more, Count | Security 93 44
12 months or more, Fair Value $ 573,702 $ 278,234
12 months or more, Unrealized Losses $ (84,343) $ (10,748)
Total Count | Security 3,167 902
Total Fair Value $ 7,291,919 $ 6,276,159
Total Unrealized Losses $ (581,340) $ (107,268)
U.S. Treasury [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 61 4
Less than 12 months, Fair Value $ 735,873 $ 58,867
Less than 12 months, Unrealized Losses $ (12,825) $ (751)
Total Count | Security 61 4
Total Fair Value $ 735,873 $ 58,867
Total Unrealized Losses $ (12,825) $ (751)
U.S. Agencies [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 29 1
Less than 12 months, Fair Value $ 175,248 $ 11,149
Less than 12 months, Unrealized Losses $ (3,159) $ (1)
Total Count | Security 29 1
Total Fair Value $ 175,248 $ 11,149
Total Unrealized Losses $ (3,159) $ (1)
Mortgage-backed [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 827 344
Less than 12 months, Fair Value $ 3,869,920 $ 5,404,968
Less than 12 months, Unrealized Losses $ (337,668) $ (87,301)
12 months or more, Count | Security 31 13
12 months or more, Fair Value $ 514,883 $ 233,295
12 months or more, Unrealized Losses $ (69,942) $ (8,571)
Total Count | Security 858 357
Total Fair Value $ 4,384,803 $ 5,638,263
Total Unrealized Losses $ (407,610) $ (95,872)
State and political subdivisions [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 1,842 357
Less than 12 months, Fair Value $ 1,281,911 $ 329,042
Less than 12 months, Unrealized Losses $ (109,512) $ (6,969)
12 months or more, Count | Security 60 31
12 months or more, Fair Value $ 54,828 $ 44,939
12 months or more, Unrealized Losses $ (14,274) $ (2,177)
Total Count | Security 1,902 388
Total Fair Value $ 1,336,739 $ 373,981
Total Unrealized Losses $ (123,786) $ (9,146)
Corporates [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 275 152
Less than 12 months, Fair Value $ 374,793 $ 193,899
Less than 12 months, Unrealized Losses $ (25,809) $ (1,498)
12 months or more, Count | Security 2  
12 months or more, Fair Value $ 3,991  
12 months or more, Unrealized Losses $ (127)  
Total Count | Security 277 152
Total Fair Value $ 378,784 $ 193,899
Total Unrealized Losses $ (25,936) $ (1,498)
Collateralized loan obligations [Member]    
Gain (Loss) on Investments [Line Items]    
Less than 12 months, Count | Security 40  
Less than 12 months, Fair Value $ 280,472  
Less than 12 months, Unrealized Losses $ (8,024)  
Total Count | Security 40  
Total Fair Value $ 280,472  
Total Unrealized Losses $ (8,024)