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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 40,636 | $ 1,736,843
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (484) | (193,815)
Fair Value, 12 Months or Longer, Available-for-sale | 2,829,568 | 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (627,964) | (306,377)
Fair Value, Available-for-sale | 2,870,204 | 3,251,395
Gross Unrealized Holding Losses, Available-for-sale | (628,448) | (500,192)
Fair Value, Less Than 12 Months, Held-to-maturity | 109,966 | 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (7,127) | (145,162)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,855,992 | 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (513,000) | (254,465)
Fair Value, Held-to-maturity | 1,965,958 | 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity | (520,127) | (399,627)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 3 | 54,005
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | 0 | (4,796)
Fair Value, 12 Months or Longer, Available-for-sale | 377,495 | 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (136,663) | (91,170)
Fair Value, Available-for-sale | 377,498 | 439,300
Gross Unrealized Holding Losses, Available-for-sale | (136,663) | (95,966)
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 0 | (60,598)
Fair Value, 12 Months or Longer, Held-to-maturity | 617,769 | 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (194,237) | (71,132)
Fair Value, Held-to-maturity | 617,769 | 695,616
Gross Unrealized Holding Losses, Held-to-maturity | (194,237) | (131,730)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 825 | 1,658,331
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (16) | (187,842)
Fair Value, 12 Months or Longer, Available-for-sale | 2,435,125 | 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (488,743) | (215,207)
Fair Value, Available-for-sale | 2,435,950 | 2,787,588
Gross Unrealized Holding Losses, Available-for-sale | (488,759) | (403,049)
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 0 | (9,042)
Fair Value, 12 Months or Longer, Held-to-maturity | 539,123 | 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (134,290) | (96,825)
Fair Value, Held-to-maturity | 539,123 | 600,929
Gross Unrealized Holding Losses, Held-to-maturity | (134,290) | (105,867)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 5,699 | 24,507
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (451) | (1,177)
Fair Value, 12 Months or Longer, Available-for-sale | 16,948 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (2,558) | 0
Fair Value, Available-for-sale | 22,647 | 24,507
Gross Unrealized Holding Losses, Available-for-sale | (3,009) | (1,177)
Fair Value, Less Than 12 Months, Held-to-maturity | 109,966 | 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (7,127) | (35,656)
Fair Value, 12 Months or Longer, Held-to-maturity | 288,267 | 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (60,492) | (12,031)
Fair Value, Held-to-maturity | 398,233 | 366,052
Gross Unrealized Holding Losses, Held-to-maturity | (67,619) | (47,687)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 34,109 |
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (17) |
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 | 34,109 |
Gross Unrealized Holding Losses, Available-for-sale | (17) |
Fair Value, Less Than 12 Months, Held-to-maturity | 0 | 179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 0 | (39,866)
Fair Value, 12 Months or Longer, Held-to-maturity | 410,833 | 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (123,981) | (74,477)
Fair Value, Held-to-maturity | 410,833 | 434,428
Gross Unrealized Holding Losses, Held-to-maturity | $ (123,981) | $ (114,343)

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