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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 39,187 | $ 3,334
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | (149) | (17)
Fair Value, 12 Months or Longer, Available-for-sale | 2,794,439 | 2,913,626
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (485,522) | (449,850)
Fair Value, Available-for-sale | 2,833,626 | 2,916,960
Gross Unrealized Holding Losses, Available-for-sale | (485,671) | (449,867)
Fair Value, Less Than 12 Months, Held-to-maturity | 46,060 | 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (649) | (200)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,892,303 | 1,938,543
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (412,129) | (384,967)
Fair Value, Held-to-maturity | 1,938,363 | 1,959,152
Gross Unrealized Holding Losses, Held-to-maturity | (412,778) | (385,167)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 0 | 0
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 378,893 | 389,359
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (116,682) | (112,872)
Fair Value, Available-for-sale | 378,893 | 389,359
Gross Unrealized Holding Losses, Available-for-sale | (116,682) | (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 | 635,698 | 646,737
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (162,528) | (156,155)
Fair Value, Held-to-maturity | 635,698 | 646,737
Gross Unrealized Holding Losses, Held-to-maturity | (162,528) | (156,155)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 32,640 | 0
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | (4) | 0
Fair Value, 12 Months or Longer, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | 32,640 | 0
Gross Unrealized Holding Losses, Available-for-sale | (4) | 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 | 423,080 | 432,684
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (103,672) | (97,972)
Fair Value, Held-to-maturity | 423,080 | 432,684
Gross Unrealized Holding Losses, Held-to-maturity | (103,672) | (97,972)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 22 | 48
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 0 | 0
Fair Value, 12 Months or Longer, Available-for-sale | 2,397,803 | 2,506,162
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (367,613) | (336,107)
Fair Value, Available-for-sale | 2,397,825 | 2,506,210
Gross Unrealized Holding Losses, Available-for-sale | (367,613) | (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 | 543,529 | 565,655
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (109,336) | (97,436)
Fair Value, Held-to-maturity | 543,529 | 565,655
Gross Unrealized Holding Losses, Held-to-maturity | (109,336) | (97,436)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 6,525 | 3,286
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | (145) | (17)
Fair Value, 12 Months or Longer, Available-for-sale | 17,743 | 18,105
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,227) | (871)
Fair Value, Available-for-sale | 24,268 | 21,391
Gross Unrealized Holding Losses, Available-for-sale | (1,372) | (888)
Fair Value, Less Than 12 Months, Held-to-maturity | 46,060 | 20,609
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (649) | (200)
Fair Value, 12 Months or Longer, Held-to-maturity | 289,996 | 293,467
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (36,593) | (33,404)
Fair Value, Held-to-maturity | 336,056 | 314,076
Gross Unrealized Holding Losses, Held-to-maturity | $ (37,242) | $ (33,604)

X
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