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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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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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- 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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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 http://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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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