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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 87,601 | $ 1,736,843
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (3,386) | (193,815)
Fair Value, 12 Months or Longer, Available-for-sale | 2,976,856 | 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (494,347) | (306,377)
Fair Value, Available-for-sale | 3,064,457 | 3,251,395
Gross Unrealized Holding Losses, Available-for-sale | (497,733) | (500,192)
Fair Value, Less Than 12 Months, Held-to-maturity | 245,969 | 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (9,140) | (145,162)
Fair Value, 12 Months or Longer, Held-to-maturity | 1,777,733 | 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (396,568) | (254,465)
Fair Value, Held-to-maturity | 2,023,702 | 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity | (405,708) | (399,627)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 745 | 54,005
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (17) | (4,796)
Fair Value, 12 Months or Longer, Available-for-sale | 407,711 | 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (111,170) | (91,170)
Fair Value, Available-for-sale | 408,456 | 439,300
Gross Unrealized Holding Losses, Available-for-sale | (111,187) | (95,966)
Fair Value, Less Than 12 Months, Held-to-maturity | 47,110 | 376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (2,884) | (60,598)
Fair Value, 12 Months or Longer, Held-to-maturity | 615,080 | 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (152,727) | (71,132)
Fair Value, Held-to-maturity | 662,190 | 695,616
Gross Unrealized Holding Losses, Held-to-maturity | (155,611) | (131,730)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 80,414 | 1,658,331
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (3,322) | (187,842)
Fair Value, 12 Months or Longer, Available-for-sale | 2,551,205 | 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (381,941) | (215,207)
Fair Value, Available-for-sale | 2,631,619 | 2,787,588
Gross Unrealized Holding Losses, Available-for-sale | (385,263) | (403,049)
Fair Value, Less Than 12 Months, Held-to-maturity | 91,805 | 188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (3,138) | (9,042)
Fair Value, 12 Months or Longer, Held-to-maturity | 489,463 | 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (100,511) | (96,825)
Fair Value, Held-to-maturity | 581,268 | 600,929
Gross Unrealized Holding Losses, Held-to-maturity | (103,649) | (105,867)
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 6,442 | 24,507
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (47) | (1,177)
Fair Value, 12 Months or Longer, Available-for-sale | 17,940 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (1,236) | 0
Fair Value, Available-for-sale | 24,382 | 24,507
Gross Unrealized Holding Losses, Available-for-sale | (1,283) | (1,177)
Fair Value, Less Than 12 Months, Held-to-maturity | 92,899 | 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (2,499) | (35,656)
Fair Value, 12 Months or Longer, Held-to-maturity | 253,674 | 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (38,697) | (12,031)
Fair Value, Held-to-maturity | 346,573 | 366,052
Gross Unrealized Holding Losses, Held-to-maturity | (41,196) | (47,687)
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 14,155 | 179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (619) | (39,866)
Fair Value, 12 Months or Longer, Held-to-maturity | 419,516 | 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (104,633) | (74,477)
Fair Value, Held-to-maturity | 433,671 | 434,428
Gross Unrealized Holding Losses, Held-to-maturity | $ (105,252) | $ (114,343)

X
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