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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
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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

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