Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 1,736,843	$ 1,916,040
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(193,815)	(26,614)
Fair Value, 12 Months or Longer, Available-for-sale	1,514,552	97,989
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(306,377)	(3,274)
Fair Value, Available-for-sale	3,251,395	2,014,029
Gross Unrealized Holding Losses, Available-for-sale	(500,192)	(29,888)
Fair Value, Less Than 12 Months, Held-to-maturity	1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(145,162)
Fair Value, 12 Months or Longer, Held-to-maturity	1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(254,465)
Fair Value, Held-to-maturity	2,097,025
Gross Unrealized Holding Losses, Held-to-maturity	(399,627)
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	54,005	450,393
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(4,796)	(11,515)
Fair Value, 12 Months or Longer, Available-for-sale	385,295	53,745
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(91,170)	(2,468)
Fair Value, Available-for-sale	439,300	504,138
Gross Unrealized Holding Losses, Available-for-sale	(95,966)	(13,983)
Fair Value, Less Than 12 Months, Held-to-maturity	376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(60,598)
Fair Value, 12 Months or Longer, Held-to-maturity	319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(71,132)
Fair Value, Held-to-maturity	695,616
Gross Unrealized Holding Losses, Held-to-maturity	(131,730)
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Held-to-maturity	179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(39,866)
Fair Value, 12 Months or Longer, Held-to-maturity	255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(74,477)
Fair Value, Held-to-maturity	434,428
Gross Unrealized Holding Losses, Held-to-maturity	(114,343)
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	1,658,331	1,465,647
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(187,842)	(15,099)
Fair Value, 12 Months or Longer, Available-for-sale	1,129,257	44,244
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	(215,207)	(806)
Fair Value, Available-for-sale	2,787,588	1,509,891
Gross Unrealized Holding Losses, Available-for-sale	(403,049)	(15,905)
Fair Value, Less Than 12 Months, Held-to-maturity	188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(9,042)
Fair Value, 12 Months or Longer, Held-to-maturity	412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(96,825)
Fair Value, Held-to-maturity	600,929
Gross Unrealized Holding Losses, Held-to-maturity	(105,867)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	24,507
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	(1,177)
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	24,507
Gross Unrealized Holding Losses, Available-for-sale	(1,177)
Fair Value, Less Than 12 Months, Held-to-maturity	312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(35,656)
Fair Value, 12 Months or Longer, Held-to-maturity	53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(12,031)
Fair Value, Held-to-maturity	366,052
Gross Unrealized Holding Losses, Held-to-maturity	$ (47,687)

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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