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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Available For Sale Securities Fair Value Current	$ 1,972,599	$ 1,916,040
Available For Sale Securities Gross Unrealized Holding Losses Current	(255,805)	(26,614)
Available For Sale Securities Fair Value Non Current	1,345,303	97,989
Available For Sale Securities Gross Unrealized Holding Losses Non Current	(284,664)	(3,274)
Available For Sale Securities Fair Value	3,317,902	2,014,029
Available For Sale Securities Gross Unrealized Holding Losses	(540,469)	(29,888)
Fair Value, Less Than 12 Months, Held-to-maturity	1,631,262
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(272,443)
Fair Value, 12 Months or Longer, Held-to-maturity	505,741
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(134,499)
Fair Value, Held-to-maturity	2,137,003
Gross Unrealized Holding Losses, Held-to-maturity	(406,942)
CMO/REMIC [Member]
Schedule of Investments [Line Items]
Available For Sale Securities Fair Value Current	59,884	450,393
Available For Sale Securities Gross Unrealized Holding Losses Current	(4,693)	(11,515)
Available For Sale Securities Fair Value Non Current	396,503	53,745
Available For Sale Securities Gross Unrealized Holding Losses Non Current	(84,555)	(2,468)
Available For Sale Securities Fair Value	456,387	504,138
Available For Sale Securities Gross Unrealized Holding Losses	(89,248)	(13,983)
Fair Value, Less Than 12 Months, Held-to-maturity	624,470
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(97,023)
Fair Value, 12 Months or Longer, Held-to-maturity	97,553
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(20,925)
Fair Value, Held-to-maturity	722,023
Gross Unrealized Holding Losses, Held-to-maturity	(117,948)
Mortgage-backed Securities [Member]
Schedule of Investments [Line Items]
Available For Sale Securities Fair Value Current	1,889,658	1,465,647
Available For Sale Securities Gross Unrealized Holding Losses Current	(248,476)	(15,099)
Available For Sale Securities Fair Value Non Current	948,800	44,244
Available For Sale Securities Gross Unrealized Holding Losses Non Current	(200,109)	(806)
Available For Sale Securities Fair Value	2,838,458	1,509,891
Available For Sale Securities Gross Unrealized Holding Losses	(448,585)	(15,905)
Fair Value, Less Than 12 Months, Held-to-maturity	505,153
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(86,409)
Fair Value, 12 Months or Longer, Held-to-maturity	102,395
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(24,950)
Fair Value, Held-to-maturity	607,548
Gross Unrealized Holding Losses, Held-to-maturity	(111,359)
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Available For Sale Securities Fair Value Current	23,057	0
Available For Sale Securities Gross Unrealized Holding Losses Current	(2,636)	0
Available For Sale Securities Fair Value Non Current		0
Available For Sale Securities Gross Unrealized Holding Losses Non Current		0
Available For Sale Securities Fair Value	23,057	0
Available For Sale Securities Gross Unrealized Holding Losses	(2,636)	$ 0
Fair Value, Less Than 12 Months, Held-to-maturity	314,186
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(49,463)
Fair Value, 12 Months or Longer, Held-to-maturity	51,016
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(14,625)
Fair Value, Held-to-maturity	365,202
Gross Unrealized Holding Losses, Held-to-maturity	(64,088)
Government Agency/GSE [Member]
Schedule of Investments [Line Items]
Fair Value, Less Than 12 Months, Held-to-maturity	187,453
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity	(39,548)
Fair Value, 12 Months or Longer, Held-to-maturity	254,777
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity	(73,999)
Fair Value, Held-to-maturity	442,230
Gross Unrealized Holding Losses, Held-to-maturity	$ (113,547)

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

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