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Securities - Schedule of Unrealized Losses on Investment Securities (Detail)
$ in Thousands
Mar. 31, 2025
USD ($)
Security
Dec. 31, 2024
USD ($)
Security
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 642,608 $ 223,438
Less than 12 months, Unrealized Losses $ (2,094) $ (1,966)
Less than 12 months, Number of Securities | Security 128 47
12 months or more, Fair Value $ 1,777,853 $ 1,850,875
12 months or more, Unrealized Losses $ (258,377) $ (293,453)
12 months or more, Number of Securities | Security 606 626
Fair Value, Total $ 2,420,461 $ 2,074,313
Unrealized Losses, Total $ (260,471) $ (295,419)
Number of Securities Total | Security 734 673
US Treasury Securities [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 98,654 $ 48,846
Less than 12 months, Unrealized Losses $ (45) $ (63)
Less than 12 months, Number of Securities | Security 4 2
Fair Value, Total $ 98,654 $ 48,846
Unrealized Losses, Total $ (45) $ (63)
Number of Securities Total | Security 4 2
U.S. Government Sponsored Entities and Agencies [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 1,407  
Less than 12 months, Unrealized Losses $ (1)  
Less than 12 months, Number of Securities | Security 1  
12 months or more, Fair Value $ 194,485 $ 194,242
12 months or more, Unrealized Losses $ (25,723) $ (30,702)
12 months or more, Number of Securities | Security 43 43
Fair Value, Total $ 195,892 $ 194,242
Unrealized Losses, Total $ (25,724) $ (30,702)
Number of Securities Total | Security 44 43
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 $ 468,090 $ 149,466
Less than 12 months, Unrealized Losses $ (1,596) $ (1,742)
Less than 12 months, Number of Securities | Security 70 32
12 months or more, Fair Value $ 1,391,481 $ 1,408,115
12 months or more, Unrealized Losses $ (226,206) $ (255,346)
12 months or more, Number of Securities | Security 445 447
Fair Value, Total $ 1,859,571 $ 1,557,581
Unrealized Losses, Total $ (227,802) $ (257,088)
Number of Securities Total | Security 515 479
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 $ 4,189 $ 9,919
Less than 12 months, Unrealized Losses $ (1) $ (7)
Less than 12 months, Number of Securities | Security 2 1
12 months or more, Fair Value $ 140,123 $ 193,085
12 months or more, Unrealized Losses $ (3,521) $ (4,135)
12 months or more, Number of Securities | Security 38 50
Fair Value, Total $ 144,312 $ 203,004
Unrealized Losses, Total $ (3,522) $ (4,142)
Number of Securities Total | Security 40 51
Asset-Backed Securities [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 21,208  
Less than 12 months, Unrealized Losses $ (73)  
Less than 12 months, Number of Securities | Security 6  
12 months or more, Fair Value  
Fair Value, Total 21,208  
Unrealized Losses, Total $ (73)  
Number of Securities Total | Security 6  
Obligations of State and Political Subdivisions [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 25,808 $ 10,728
Less than 12 months, Unrealized Losses $ (319) $ (133)
Less than 12 months, Number of Securities | Security 28 8
12 months or more, Fair Value $ 46,331 $ 48,038
12 months or more, Unrealized Losses $ (2,883) $ (3,191)
12 months or more, Number of Securities | Security 78 84
Fair Value, Total $ 72,139 $ 58,766
Unrealized Losses, Total $ (3,202) $ (3,324)
Number of Securities Total | Security 106 92
Corporate Debt Securities [Member]    
Net Unrealized Gains And Losses On Investments [Line Items]    
Less than 12 months, Fair Value $ 23,252 $ 4,479
Less than 12 months, Unrealized Losses $ (59) $ (21)
Less than 12 months, Number of Securities | Security 17 4
12 months or more, Fair Value $ 5,433 $ 7,395
12 months or more, Unrealized Losses $ (44) $ (79)
12 months or more, Number of Securities | Security 2 2
Fair Value, Total $ 28,685 $ 11,874
Unrealized Losses, Total $ (103) $ (100)
Number of Securities Total | Security 19 6