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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 2,997,047 | $ 3,398,942
Gross Unrealized Holding Gain, Available-for-sale |  | 471 | 7,050
Gross Unrealized Holding Loss, Available-for-sale |  | (455,403) | (449,867)
Investment securities available-for-sale |  | $ 2,542,115 | $ 2,956,125
Total Percent, Available-for-sale |  | 100.00% | 100.00%
Amortized Cost, Held-to-maturity |  | $ 2,379,668 | $ 2,464,610
Gross Unrealized Holding Gain, Held-to-maturity |  | 1,158 | 3,438
Gross Unrealized Holding Loss, Held-to-maturity |  | (426,481) | (385,167)
Fair Value, Held-to-maturity |  | $ 1,954,345 | $ 2,082,881
Total Percent, Held-to-maturity |  | 100.00% | 100.00%
Government Agency/GSE [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 34,149 | $ 32,229
Gross Unrealized Holding Gain, Available-for-sale |  | 106 | 24
Gross Unrealized Holding Loss, Available-for-sale |  | 0 | 0
Investment securities available-for-sale |  | $ 34,255 | $ 32,253
Total Percent, Available-for-sale |  | 1.35% | 1.09%
Amortized Cost, Held-to-maturity |  | $ 514,572 | $ 530,656
Gross Unrealized Holding Gain, Held-to-maturity |  | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity |  | (106,315) | (97,972)
Fair Value, Held-to-maturity |  | $ 408,257 | $ 432,684
Total Percent, Held-to-maturity |  | 21.62% | 21.53%
Mortgage-backed Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 2,460,573 | $ 2,843,744
Gross Unrealized Holding Gain, Available-for-sale |  | 337 | 42
Gross Unrealized Holding Loss, Available-for-sale |  | (326,376) | (336,107)
Investment securities available-for-sale |  | $ 2,134,534 | $ 2,507,679
Total Percent, Available-for-sale |  | 83.97% | 84.83%
Amortized Cost, Held-to-maturity |  | $ 614,383 | $ 663,090
Gross Unrealized Holding Gain, Held-to-maturity |  | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity |  | (110,020) | (97,436)
Fair Value, Held-to-maturity |  | $ 504,363 | $ 565,654
Total Percent, Held-to-maturity |  | 25.82% | 26.90%
CMO/REMIC |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 471,921 | $ 502,234
Gross Unrealized Holding Gain, Available-for-sale |  | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale |  | (120,399) | (112,872)
Investment securities available-for-sale |  | $ 351,522 | $ 389,362
Total Percent, Available-for-sale |  | 13.82% | 13.17%
Amortized Cost, Held-to-maturity |  | $ 784,059 | $ 802,892
Gross Unrealized Holding Gain, Held-to-maturity |  | 0 | 0
Gross Unrealized Holding Loss, Held-to-maturity |  | (170,121) | (156,155)
Fair Value, Held-to-maturity |  | $ 613,938 | $ 646,737
Total Percent, Held-to-maturity |  | 32.95% | 32.58%
Municipal Bonds [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 21,755 | $ 26,477
Gross Unrealized Holding Gain, Available-for-sale |  | 28 | 46
Gross Unrealized Holding Loss, Available-for-sale |  | (1,406) | (888)
Investment securities available-for-sale |  | $ 20,377 | $ 25,635
Total Percent, Available-for-sale |  | 0.80% | 0.87%
Amortized Cost, Held-to-maturity |  | $ 455,199 | $ 467,972
Gross Unrealized Holding Gain, Held-to-maturity |  | 1,158 | 3,438
Gross Unrealized Holding Loss, Held-to-maturity |  | (40,025) | (33,604)
Fair Value, Held-to-maturity |  | $ 416,332 | $ 437,806
Total Percent, Held-to-maturity |  | 19.13% | 18.99%
Other Securities [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale |  | $ 1,427 | $ 1,196
Gross Unrealized Holding Gain, Available-for-sale |  | 0 | 0
Gross Unrealized Holding Loss, Available-for-sale |  | 0 | 0
Investment securities available-for-sale |  | $ 1,427 | $ 1,196
Total Percent, Available-for-sale |  | 0.06% | 0.04%
Amortized Cost, Held-to-maturity |  | $ 11,455 |
Gross Unrealized Holding Gain, Held-to-maturity |  | 0 |
Gross Unrealized Holding Loss, Held-to-maturity |  | 0 |
Fair Value, Held-to-maturity |  | $ 11,455 |
Total Percent, Held-to-maturity |  | 0.48% |
Unallocated Portfolio Layer Fair Value [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amortized Cost, Available-for-sale | [1] | $ 7,222 |
Amortized Cost, Available-for-sale | [1] |  | $ (6,938)
Gross Unrealized Holding Gain, Available-for-sale | [1] | 0 | 6,938
Gross Unrealized Holding Loss, Available-for-sale | [1] | (7,222) | 0
Investment securities available-for-sale | [1] | $ 0 | $ 0
Total Percent, Available-for-sale | [1] | 0.00% | 0.00%
[1] | Represents the amount of portfolio layer method basis adjustments related to AFS MBS securities hedged in a closed portfolio. Under U.S. GAAP, portfolio layer method basis adjustments are not allocated to individual securities, however the amounts impact the unrealized gains or losses for the individual securities being hedged. Refer to Note 3 and Note 18 for additional information.

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