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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 1,916,040	$ 169,193
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(26,614)	(350)
Fair Value, 12 Months or Longer, Available-for-sale	97,989	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(3,274)	0
Fair Value, Available-for-sale	2,014,029	169,193
Gross Unrealized Holding Losses, Available-for-sale	(29,888)	(350)
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	450,393	96,974
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(11,515)	(249)
Fair Value, 12 Months or Longer, Available-for-sale	53,745	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(2,468)	0
Fair Value, Available-for-sale	504,138	96,974
Gross Unrealized Holding Losses, Available-for-sale	(13,983)	(249)
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	1,465,647	72,219
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(15,099)	(101)
Fair Value, 12 Months or Longer, Available-for-sale	44,244	0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(806)	0
Fair Value, Available-for-sale	1,509,891	72,219
Gross Unrealized Holding Losses, Available-for-sale	(15,905)	(101)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale
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
Gross Unrealized Holding Losses, Available-for-sale		$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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