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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 2,344,856 | $ 1,916,040
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (178,446) | (26,614)
Fair Value, 12 Months or Longer, Available-for-sale | 1,188,776 | 97,989
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (168,365) | (3,274)
Fair Value, Available-for-sale | 3,533,632 | 2,014,029
Gross Unrealized Holding Losses, Available-for-sale | (346,811) | (29,888)
Fair Value, Less Than 12 Months, Held-to-maturity | 1,724,105 |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (220,660) |
Fair Value, 12 Months or Longer, Held-to-maturity | 284,830 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (58,228) |
Fair Value, Held-to-maturity | 2,008,935 |
Gross Unrealized Holding Losses, Held-to-maturity | (278,888) |
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 109,306 | 450,393
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (8,662) | (11,515)
Fair Value, 12 Months or Longer, Available-for-sale | 378,651 | 53,745
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (58,939) | (2,468)
Fair Value, Available-for-sale | 487,957 | 504,138
Gross Unrealized Holding Losses, Available-for-sale | (67,601) | (13,983)
Fair Value, Less Than 12 Months, Held-to-maturity | 715,805 |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (83,786) |
Fair Value, 12 Months or Longer, Held-to-maturity |  |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity |  |
Fair Value, Held-to-maturity | 715,805 |
Gross Unrealized Holding Losses, Held-to-maturity | (83,786) |
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 2,212,757 | 1,465,647
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (168,634) | (15,099)
Fair Value, 12 Months or Longer, Available-for-sale | 810,125 | 44,244
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | (109,426) | (806)
Fair Value, Available-for-sale | 3,022,882 | 1,509,891
Gross Unrealized Holding Losses, Available-for-sale | (278,060) | (15,905)
Fair Value, Less Than 12 Months, Held-to-maturity | 552,966 |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (73,582) |
Fair Value, 12 Months or Longer, Held-to-maturity | 4,209 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (762) |
Fair Value, Held-to-maturity | 557,175 |
Gross Unrealized Holding Losses, Held-to-maturity | (74,344) |
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 22,793 | 0
Gross Unrealized Holding Losses, Less Than 12 Months, Available-for-sale | (1,150) | 0
Fair Value, 12 Months or Longer, Available-for-sale |  | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 0 | 0
Fair Value, Available-for-sale | 22,793 | 0
Gross Unrealized Holding Losses, Available-for-sale | (1,150) | $ 0
Fair Value, Less Than 12 Months, Held-to-maturity | 221,355 |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (26,968) |
Fair Value, 12 Months or Longer, Held-to-maturity | 54,397 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (11,122) |
Fair Value, Held-to-maturity | 275,752 |
Gross Unrealized Holding Losses, Held-to-maturity | (38,090) |
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 233,979 |
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | (36,324) |
Fair Value, 12 Months or Longer, Held-to-maturity | 226,224 |
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | (46,344) |
Fair Value, Held-to-maturity | 460,203 |
Gross Unrealized Holding Losses, Held-to-maturity | $ (82,668) |

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- Definition Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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