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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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) |

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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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