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Securities - Schedule of Unrealized Losses on Investment Securities (Detail)
$ in Thousands
Dec. 31, 2021
USD ($)
Security
Dec. 31, 2020
USD ($)
Security
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 1,825,891 $ 340,022
Less than 12 months, Unrealized Losses $ (31,548) $ (1,638)
Less than 12 months, Number of Securities | Security 187 53
12 months or more, Fair Value $ 252,725 $ 4,136
12 months or more, Unrealized Losses $ (5,227) $ (121)
12 months or more, Number of Securities | Security 35 3
Fair Value, Total $ 2,078,616 $ 344,158
Unrealized Losses, Total $ (36,775) $ (1,759)
Number of Securities Total | Security 222 56
U.S. Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 114,486 $ 18,308
Less than 12 months, Unrealized Losses $ (1,865) $ (142)
Less than 12 months, Number of Securities | Security 12 2
12 months or more, Fair Value $ 32,688  
12 months or more, Unrealized Losses $ (1,175)  
12 months or more, Number of Securities | Security 4  
Fair Value, Total $ 147,174 $ 18,308
Unrealized Losses, Total $ (3,040) $ (142)
Number of Securities Total | Security 16 2
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 1,568,138 $ 224,448
Less than 12 months, Unrealized Losses $ (29,060) $ (1,227)
Less than 12 months, Number of Securities | Security 143 41
12 months or more, Fair Value $ 141,681 $ 4,136
12 months or more, Unrealized Losses $ (3,386) $ (121)
12 months or more, Number of Securities | Security 23 3
Fair Value, Total $ 1,709,819 $ 228,584
Unrealized Losses, Total $ (32,446) $ (1,348)
Number of Securities Total | Security 166 44
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 131,970 $ 97,266
Less than 12 months, Unrealized Losses $ (579) $ (269)
Less than 12 months, Number of Securities | Security 25 10
12 months or more, Fair Value $ 78,356  
12 months or more, Unrealized Losses $ (666)  
12 months or more, Number of Securities | Security 8  
Fair Value, Total $ 210,326 $ 97,266
Unrealized Losses, Total $ (1,245) $ (269)
Number of Securities Total | Security 33 10
Obligations of State and Political Subdivisions [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 4,307  
Less than 12 months, Unrealized Losses $ (35)  
Less than 12 months, Number of Securities | Security (2)  
Fair Value, Total $ 4,307  
Unrealized Losses, Total $ (35)  
Number of Securities Total | Security 2  
Corporate Debt Securities [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 6,990  
Less than 12 months, Unrealized Losses $ (9)  
Less than 12 months, Number of Securities | Security (5)  
Fair Value, Total $ 6,990  
Unrealized Losses, Total $ (9)  
Number of Securities Total | Security 5