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Investment Securities - Summary of Continuous Unrealized Loss Position of Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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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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