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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 3,332 | $ 3,334
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (48) | (17)
Fair Value, 12 Months or Longer, Available-for-sale | 2,424,410 | 2,913,626
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (367,936) | (449,850)
Fair Value, Available-for-sale | 2,427,742 | 2,916,960
Gross Unrealized Holding Losses, Available-for-sale | (367,984) | (449,867)
Fair Value, Less Than 12 Months, Held-to-maturity | 12,760 | 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (101) | (200)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,917,373 | 1,938,543
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (344,458) | (384,967)
Fair Value, Held-to-maturity | 1,930,134 | 1,959,152
Gross Unrealized Holding Losses, Held-to-maturity | (344,558) | (385,167)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 371,006 | 389,359
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (105,044) | (112,872)
Fair Value, Available-for-sale | 371,006 | 389,359
Gross Unrealized Holding Losses, Available-for-sale | (105,044) | (112,872)
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 | 643,821 | 646,737
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (144,801) | (156,155)
Fair Value, Held-to-maturity | 643,821 | 646,737
Gross Unrealized Holding Losses, Held-to-maturity | (144,801) | (156,155)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 9 | 48
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 2,032,214 | 2,506,162
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (261,824) | (336,107)
Fair Value, Available-for-sale | 2,032,223 | 2,506,210
Gross Unrealized Holding Losses, Available-for-sale | (261,825) | (336,107)
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 | 538,947 | 565,655
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (85,320) | (97,436)
Fair Value, Held-to-maturity | 538,947 | 565,655
Gross Unrealized Holding Losses, Held-to-maturity | (85,320) | (97,436)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 3,323 | 3,286
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (48) | (17)
Fair Value, 12 Months or Longer, Available-for-sale | 21,190 | 18,105
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,068) | (871)
Fair Value, Available-for-sale | 24,513 | 21,391
Gross Unrealized Holding Losses, Available-for-sale | (1,115) | (888)
Fair Value, Less Than 12 Months, Held-to-maturity | 12,760 | 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (101) | (200)
Fair Value, 12 Months or Longer, Held-to-maturity | 301,057 | 293,467
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (29,439) | (33,404)
Fair Value, Held-to-maturity | 313,817 | 314,076
Gross Unrealized Holding Losses, Held-to-maturity | (29,539) | (33,604)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 |
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 |
Fair Value, 12 Months or Longer, Available-for-sale | 0 |
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 |
Fair Value, Available-for-sale | 0 |
Gross Unrealized Holding Losses, Available-for-sale | 0 |
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 | 433,548 | 432,684
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (84,898) | (97,972)
Fair Value, Held-to-maturity | 433,548 | 432,684
Gross Unrealized Holding Losses, Held-to-maturity | $ (84,898) | $ (97,972)

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