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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | $ 764,181 | $ 1,736,843
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 43,522 | 193,815
Fair Value, 12 Months or Longer, Available-for-sale | 2,430,213 | 1,514,552
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 416,259 | 306,377
Fair Value, Available-for-sale | 3,194,394 | 3,251,395
Gross Unrealized Holding Losses, Available-for-sale | 459,781 | 500,192
Fair Value, Less Than 12 Months, Held-to-maturity | 298,387 | 1,057,070
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 7,741 | 145,162
Fair Value, 12 Months or Longer, Held-to-maturity | 1,751,596 | 1,039,955
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 362,074 | 254,465
Fair Value, Held-to-maturity | 2,049,983 | 2,097,025
Gross Unrealized Holding Losses, Held-to-maturity | 369,815 | 399,627
CMO/REMIC [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 6,062 | 54,005
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 148 | 4,796
Fair Value, 12 Months or Longer, Available-for-sale | 423,357 | 385,295
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 97,352 | 91,170
Fair Value, Available-for-sale | 429,419 | 439,300
Gross Unrealized Holding Losses, Available-for-sale | 97,500 | 95,966
Fair Value, Less Than 12 Months, Held-to-maturity | 48,202 | 376,540
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 2,033 | 60,598
Fair Value, 12 Months or Longer, Held-to-maturity | 639,623 | 319,076
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 132,741 | 71,132
Fair Value, Held-to-maturity | 687,825 | 695,616
Gross Unrealized Holding Losses, Held-to-maturity | 134,774 | 131,730
Government Agency/GSE [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Held-to-maturity | 23,225 | 179,348
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 579 | 39,866
Fair Value, 12 Months or Longer, Held-to-maturity | 419,597 | 255,080
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 99,917 | 74,477
Fair Value, Held-to-maturity | 442,822 | 434,428
Gross Unrealized Holding Losses, Held-to-maturity | 100,496 | 114,343
Mortgage-backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 753,978 | 1,658,331
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 43,323 | 187,842
Fair Value, 12 Months or Longer, Available-for-sale | 1,992,196 | 1,129,257
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 318,240 | 215,207
Fair Value, Available-for-sale | 2,746,174 | 2,787,588
Gross Unrealized Holding Losses, Available-for-sale | 361,563 | 403,049
Fair Value, Less Than 12 Months, Held-to-maturity | 128,307 | 188,480
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 2,858 | 9,042
Fair Value, 12 Months or Longer, Held-to-maturity | 471,641 | 412,449
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 94,960 | 96,825
Fair Value, Held-to-maturity | 599,948 | 600,929
Gross Unrealized Holding Losses, Held-to-maturity | 97,818 | 105,867
Municipal Bonds [Member] |  |
Schedule of Investments [Line Items] |  |
Fair Value, Less Than 12 Months, Available-for-sale | 4,141 | 24,507
Gross Unrealized Holding Loss, Less than 12 Months, Available-for-sale | 51 | 1,177
Fair Value, 12 Months or Longer, Available-for-sale | 14,660 | 0
Gross Unrealized Holding Losses, 12 Months or Longer, Available-for-sale | 667 | 0
Fair Value, Available-for-sale | 18,801 | 24,507
Gross Unrealized Holding Losses, Available-for-sale | 718 | 1,177
Fair Value, Less Than 12 Months, Held-to-maturity | 98,653 | 312,702
Gross Unrealized Holding Loss, Less than 12 Months, Held-to-maturity | 2,271 | 35,656
Fair Value, 12 Months or Longer, Held-to-maturity | 220,735 | 53,350
Gross Unrealized Holding Losses, 12 Months or Longer, Held-to-maturity | 34,456 | 12,031
Fair Value, Held-to-maturity | 319,388 | 366,052
Gross Unrealized Holding Losses, Held-to-maturity | $ 36,727 | $ 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 less than 12 months, 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 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: 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 + Details
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