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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 1,860,164	$ 169,193
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(26,001)	(350)
Fair Value, 12 Months or Longer, Available-for-sale	32,435	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(459)	0
Fair Value, Available-for-sale	1,892,599	169,193
Gross Unrealized Holding Losses, Available-for-sale	(26,460)	(350)
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	510,308	96,974
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(7,758)	(249)
Fair Value, 12 Months or Longer, Available-for-sale	11,162	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(272)	0
Fair Value, Available-for-sale	521,470	96,974
Gross Unrealized Holding Losses, Available-for-sale	(8,030)	(249)
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	1,349,856	72,219
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale	(18,243)	(101)
Fair Value, 12 Months or Longer, Available-for-sale	21,273	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(187)	0
Fair Value, Available-for-sale	1,371,129	72,219
Gross Unrealized Holding Losses, Available-for-sale	(18,430)	(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

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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

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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.

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