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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	$ 1,759,583	$ 1,916,040
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	103,988	26,614
Fair Value, 12 Months or Longer, Available-for-sale	1,183,337	97,989
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	103,662	3,274
Fair Value, Available-for-sale	2,942,920	2,014,029
Gross Unrealized Holding Losses, Available-for-sale	207,650	29,888
Fair Value, Less Than 12 Months, Held-to-maturity	1,755,434
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	122,378
Fair Value, 12 Months or Longer, Held-to-maturity	305,694
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	38,926
Fair Value, Held-to-maturity	2,061,128
Gross Unrealized Holding Losses, Held-to-maturity	161,304
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	192,973	450,393
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	10,983	11,515
Fair Value, 12 Months or Longer, Available-for-sale	331,988	53,745
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	30,298	2,468
Fair Value, Available-for-sale	524,961	504,138
Gross Unrealized Holding Losses, Available-for-sale	41,281	13,983
Fair Value, Less Than 12 Months, Held-to-maturity	773,501
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	44,778
Fair Value, 12 Months or Longer, Held-to-maturity	0
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	0
Fair Value, Held-to-maturity	773,501
Gross Unrealized Holding Losses, Held-to-maturity	44,778
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Held-to-maturity	242,300
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	21,492
Fair Value, 12 Months or Longer, Held-to-maturity	242,589
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	31,246
Fair Value, Held-to-maturity	484,889
Gross Unrealized Holding Losses, Held-to-maturity	52,738
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	1,551,620	1,465,647
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	92,654	15,099
Fair Value, 12 Months or Longer, Available-for-sale	851,349	44,244
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale	73,364	806
Fair Value, Available-for-sale	2,402,969	1,509,891
Gross Unrealized Holding Losses, Available-for-sale	166,018	15,905
Fair Value, Less Than 12 Months, Held-to-maturity	560,752
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	43,438
Fair Value, 12 Months or Longer, Held-to-maturity	4,518
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	490
Fair Value, Held-to-maturity	565,270
Gross Unrealized Holding Losses, Held-to-maturity	43,928
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Available-for-sale	14,990	0
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale	351	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	14,990	0
Gross Unrealized Holding Losses, Available-for-sale	351	$ 0
Fair Value, Less Than 12 Months, Held-to-maturity	178,881
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	12,670
Fair Value, 12 Months or Longer, Held-to-maturity	58,587
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	7,190
Fair Value, Held-to-maturity	237,468
Gross Unrealized Holding Losses, Held-to-maturity	$ 19,860

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