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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 197,806 | $ 207,644
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (1,038) | (855)
Fair Value, 12 Months or Longer, Available-for-sale | 2,094,936 | 2,124,849
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (364,063) | (447,326)
Fair Value, Available-for-sale | 2,292,742 | 2,332,493
Gross Unrealized Holding Losses, Available-for-sale | (365,101) | (448,181)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 91,228 | 65,740
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (3,981) | (1,109)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,801,089 | 1,811,354
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (388,852) | (425,372)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 1,892,317 | 1,877,094
Gross Unrealized Holding Losses, Held-to-maturity | (392,833) | (426,481)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale |  | 1
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale |  |
Fair Value, 12 Months or Longer, Available-for-sale | 349,609 | 351,521
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (112,812) | (120,399)
Fair Value, Available-for-sale | 349,609 | 351,522
Gross Unrealized Holding Losses, Available-for-sale | (112,812) | (120,399)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity |  |
Fair Value, 12 Months or Longer, Held-to-maturity | 610,397 | 613,937
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (160,170) | (170,121)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 610,397 | 613,937
Gross Unrealized Holding Losses, Held-to-maturity | (160,170) | (170,121)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 192,892 | 204,428
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (1,036) | (700)
Fair Value, 12 Months or Longer, Available-for-sale | 1,725,631 | 1,757,066
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (250,072) | (325,677)
Fair Value, Available-for-sale | 1,918,523 | 1,961,494
Gross Unrealized Holding Losses, Available-for-sale | (251,108) | (326,377)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 1,922 | 2,072
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (5) | (42)
Fair Value, 12 Months or Longer, Held-to-maturity | 483,518 | 502,292
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (98,097) | (109,978)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 485,440 | 504,364
Gross Unrealized Holding Losses, Held-to-maturity | (98,102) | (110,020)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale |  | 3,215
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale |  | (155)
Fair Value, 12 Months or Longer, Available-for-sale | 19,696 | 16,262
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,179) | (1,250)
Fair Value, Available-for-sale | 19,696 | 19,477
Gross Unrealized Holding Losses, Available-for-sale | (1,179) | (1,405)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 89,306 | 63,668
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (3,976) | (1,067)
Fair Value, 12 Months or Longer, Held-to-maturity | 292,372 | 286,868
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (38,922) | (38,958)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 381,678 | 350,536
Gross Unrealized Holding Losses, Held-to-maturity | (42,898) | (40,025)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 4,914 |
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (2) |
Fair Value, Available-for-sale | 4,914 |
Gross Unrealized Holding Losses, Available-for-sale | (2) |
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity |  |
Fair Value, 12 Months or Longer, Held-to-maturity | 414,802 | 408,257
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (91,663) | (106,315)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 414,802 | 408,257
Gross Unrealized Holding Losses, Held-to-maturity | $ (91,663) | $ (106,315)

X
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