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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 85,194 | $ 207,644
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | (159) | (855)
Fair Value, 12 Months or Longer, Available-for-sale | 2,129,713 | 2,124,849
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (389,405) | (447,326)
Fair Value, Available-for-sale | 2,214,907 | 2,332,493
Gross Unrealized Holding Losses, Available-for-sale | (389,564) | (448,181)
Fair Value, Less Than 12 Months, Held-to-maturity | 77,622 | 65,740
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (2,430) | (1,109)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,835,363 | 1,811,354
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (392,105) | (425,372)
Fair Value, Held-to-maturity | 1,912,984 | 1,877,094
Gross Unrealized Holding Losses, Held-to-maturity | (394,535) | (426,481)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 1
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 353,861 | 351,521
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (113,401) | (120,399)
Fair Value, Available-for-sale | 353,861 | 351,522
Gross Unrealized Holding Losses, Available-for-sale | (113,401) | (120,399)
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 0 | 0
Fair Value, 12 Months or Longer, Held-to-maturity | 617,755 | 613,937
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (159,636) | (170,121)
Fair Value, Held-to-maturity | 617,755 | 613,937
Gross Unrealized Holding Losses, Held-to-maturity | (159,636) | (170,121)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 0
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 0 | 0
Fair Value, 12 Months or Longer, Held-to-maturity | 416,948 | 408,257
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (93,645) | (106,315)
Fair Value, Held-to-maturity | 416,948 | 408,257
Gross Unrealized Holding Losses, Held-to-maturity | (93,645) | (106,315)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 85,194 | 2,072
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | (159) | (42)
Fair Value, 12 Months or Longer, Available-for-sale | 1,756,443 | 502,292
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (274,534) | (109,978)
Fair Value, Available-for-sale | 1,841,637 | 504,364
Gross Unrealized Holding Losses, Available-for-sale | (274,693) | (110,020)
Fair Value, Less Than 12 Months, Held-to-maturity | 2,016 | 204,428
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (17) | (700)
Fair Value, 12 Months or Longer, Held-to-maturity | 502,640 | 1,757,066
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (99,254) | (325,677)
Fair Value, Held-to-maturity | 504,656 | 1,961,494
Gross Unrealized Holding Losses, Held-to-maturity | (99,271) | (326,377)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 63,668
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 0 | (1,067)
Fair Value, 12 Months or Longer, Available-for-sale | 19,409 | 286,868
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,470) | (38,958)
Fair Value, Available-for-sale | 19,409 | 350,536
Gross Unrealized Holding Losses, Available-for-sale | (1,470) | (40,025)
Fair Value, Less Than 12 Months, Held-to-maturity | 75,606 | 3,215
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (2,413) | (155)
Fair Value, 12 Months or Longer, Held-to-maturity | 298,020 | 16,262
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (39,569) | (1,250)
Fair Value, Held-to-maturity | 373,626 | 19,477
Gross Unrealized Holding Losses, Held-to-maturity | $ (41,983) | $ (1,405)

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