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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 1,621,397 | $ 169,193
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (16,234) | (350)
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 | 1,621,397 | 169,193
Gross Unrealized Holding Losses, Available-for-sale | (16,234) | (350)
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 486,494 | 96,974
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (5,348) | (249)
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 | 486,494 | 96,974
Gross Unrealized Holding Losses, Available-for-sale | (5,348) | (249)
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 1,134,903 | 72,219
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (10,886) | (101)
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 | 1,134,903 | 72,219
Gross Unrealized Holding Losses, Available-for-sale | (10,886) | (101)
Municipal Bonds [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 | 0 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | 0 | 0
Gross Unrealized Holding Losses, Available-for-sale | $ 0 | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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