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Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands | Sep. 30, 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 | $ 231,625 | $ 223,438
Less than 12 months, Unrealized Losses | $ (1,458) | $ (1,966)
Less than 12 months, Number of Securities | Security | 65 | 47
12 months or more, Fair Value | $ 1,696,166 | $ 1,850,875
12 months or more, Unrealized Losses | $ (214,990) | $ (293,453)
12 months or more, Number of Securities | Security | 566 | 626
Fair Value, Total | $ 1,927,791 | $ 2,074,313
Unrealized Losses, Total | $ (216,448) | $ (295,419)
Number of Securities Total | Security | 631 | 673
US Treasury Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value |  | $ 48,846
Less than 12 months, Unrealized Losses |  | $ (63)
Less than 12 months, Number of Securities | Security |  | 2
Fair Value, Total |  | $ 48,846
Unrealized Losses, Total |  | $ (63)
Number of Securities Total | Security |  | 2
U.S. Government Sponsored Entities and Agencies [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 5,837 |
Less than 12 months, Unrealized Losses | $ (68) |
Less than 12 months, Number of Securities | Security | 1 |
12 months or more, Fair Value | $ 191,084 | $ 194,242
12 months or more, Unrealized Losses | $ (21,912) | $ (30,702)
12 months or more, Number of Securities | Security | 42 | 43
Fair Value, Total | $ 196,921 | $ 194,242
Unrealized Losses, Total | $ (21,980) | $ (30,702)
Number of Securities Total | Security | 43 | 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 | $ 168,195 | $ 149,466
Less than 12 months, Unrealized Losses | $ (1,086) | $ (1,742)
Less than 12 months, Number of Securities | Security | 39 | 32
12 months or more, Fair Value | $ 1,351,860 | $ 1,408,115
12 months or more, Unrealized Losses | $ (187,806) | $ (255,346)
12 months or more, Number of Securities | Security | 441 | 447
Fair Value, Total | $ 1,520,055 | $ 1,557,581
Unrealized Losses, Total | $ (188,892) | $ (257,088)
Number of Securities Total | Security | 480 | 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 | $ 6,725 | $ 9,919
Less than 12 months, Unrealized Losses | $ (7) | $ (7)
Less than 12 months, Number of Securities | Security | 3 | 1
12 months or more, Fair Value | $ 115,946 | $ 193,085
12 months or more, Unrealized Losses | $ (3,175) | $ (4,135)
12 months or more, Number of Securities | Security | 36 | 50
Fair Value, Total | $ 122,671 | $ 203,004
Unrealized Losses, Total | $ (3,182) | $ (4,142)
Number of Securities Total | Security | 39 | 51
Asset-Backed Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 35,661 |
Less than 12 months, Unrealized Losses | $ (143) |
Less than 12 months, Number of Securities | Security | 9 |
Fair Value, Total | $ 35,661 |
Unrealized Losses, Total | $ (143) |
Number of Securities Total | Security | 9 |
Obligations of State and Political Subdivisions [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 2,657 | $ 10,728
Less than 12 months, Unrealized Losses | $ (121) | $ (133)
Less than 12 months, Number of Securities | Security | 4 | 8
12 months or more, Fair Value | $ 31,803 | $ 48,038
12 months or more, Unrealized Losses | $ (2,087) | $ (3,191)
12 months or more, Number of Securities | Security | 45 | 84
Fair Value, Total | $ 34,460 | $ 58,766
Unrealized Losses, Total | $ (2,208) | $ (3,324)
Number of Securities Total | Security | 49 | 92
Corporate Debt Securities [Member] |  |
Net Unrealized Gains And Losses On Investments [Line Items] |  |
Less than 12 months, Fair Value | $ 12,550 | $ 4,479
Less than 12 months, Unrealized Losses | $ (33) | $ (21)
Less than 12 months, Number of Securities | Security | 9 | 4
12 months or more, Fair Value | $ 5,473 | $ 7,395
12 months or more, Unrealized Losses | $ (10) | $ (79)
12 months or more, Number of Securities | Security | 2 | 2
Fair Value, Total | $ 18,023 | $ 11,874
Unrealized Losses, Total | $ (43) | $ (100)
Number of Securities Total | Security | 11 | 6

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