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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 2,840,450 |  | $ 2,997,047 |
Gross Unrealized Holding Gain, Available-for-sale | 10,957 |  | 471 |
Gross Unrealized Holding Loss, Available-for-sale | (365,101) |  | (455,403) |
Investment securities available-for-sale | $ 2,486,306 |  | $ 2,542,115 |
Total Percent, Available-for-sale | 100.00% |  | 100.00% |
Amortized Cost, Held-to-maturity | $ 2,327,230 |  | $ 2,379,668 |
Gross Unrealized Holding Gain, Held-to-maturity | 359 |  | 1,158 |
Gross Unrealized Holding Loss, Held-to-maturity | (392,833) |  | (426,481) |
Fair Value, Held-to-maturity | $ 1,934,756 |  | $ 1,954,345 |
Total Percent, Held-to-maturity | 100.00% |  | 100.00% |
Government Agency/GSE [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 34,369 |  | $ 34,149 |
Gross Unrealized Holding Gain, Available-for-sale | 5 |  | 106 |
Gross Unrealized Holding Loss, Available-for-sale | (2) |  | 0 |
Investment securities available-for-sale | $ 34,372 |  | $ 34,255 |
Total Percent, Available-for-sale | 1.38% |  | 1.35% |
Amortized Cost, Held-to-maturity | $ 506,465 |  | $ 514,572 |
Gross Unrealized Holding Gain, Held-to-maturity | 0 |  | 0 |
Gross Unrealized Holding Loss, Held-to-maturity | (91,663) |  | (106,315) |
Fair Value, Held-to-maturity | $ 414,802 |  | $ 408,257 |
Total Percent, Held-to-maturity | 21.76% |  | 21.62% |
Mortgage-backed Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 2,329,953 |  | $ 2,460,573 |
Gross Unrealized Holding Gain, Available-for-sale | 1,339 |  | 337 |
Gross Unrealized Holding Loss, Available-for-sale | (251,108) |  | (326,376) |
Investment securities available-for-sale | $ 2,080,184 |  | $ 2,134,534 |
Total Percent, Available-for-sale | 83.67% |  | 83.97% |
Amortized Cost, Held-to-maturity | $ 583,542 |  | $ 614,383 |
Gross Unrealized Holding Gain, Held-to-maturity | 0 |  | 0 |
Gross Unrealized Holding Loss, Held-to-maturity | (98,102) |  | (110,020) |
Fair Value, Held-to-maturity | $ 485,440 |  | $ 504,363 |
Total Percent, Held-to-maturity | 25.07% |  | 25.82% |
Municipal Bonds [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 21,770 |  | $ 21,755 |
Gross Unrealized Holding Gain, Available-for-sale | 28 |  | 28 |
Gross Unrealized Holding Loss, Available-for-sale | (1,179) |  | (1,406) |
Investment securities available-for-sale | $ 20,619 |  | $ 20,377 |
Total Percent, Available-for-sale | 0.83% |  | 0.80% |
Amortized Cost, Held-to-maturity | $ 448,971 |  | $ 455,199 |
Gross Unrealized Holding Gain, Held-to-maturity | 359 |  | 1,158 |
Gross Unrealized Holding Loss, Held-to-maturity | (42,898) |  | (40,025) |
Fair Value, Held-to-maturity | $ 406,432 |  | $ 416,332 |
Total Percent, Held-to-maturity | 19.30% |  | 19.13% |
Other Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 1,521 |  | $ 1,427 |
Gross Unrealized Holding Gain, Available-for-sale | 0 |  | 0 |
Gross Unrealized Holding Loss, Available-for-sale | 0 |  | 0 |
Investment securities available-for-sale | $ 1,521 |  | $ 1,427 |
Total Percent, Available-for-sale | 0.06% |  | 0.06% |
Amortized Cost, Held-to-maturity | $ 17,685 | [1] | $ 11,455 | [2]
Gross Unrealized Holding Gain, Held-to-maturity | 0 | [1] | 0 | [2]
Gross Unrealized Holding Loss, Held-to-maturity | 0 | [1] | 0 | [2]
Fair Value, Held-to-maturity | $ 17,685 | [1] | $ 11,455 | [2]
Total Percent, Held-to-maturity | 0.76% | [1] | 0.48% | [2]
Unallocated Portfolio Layer Fair Value [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ (9,585) | [3] | $ 7,222 | [4]
Gross Unrealized Holding Gain, Available-for-sale | 9,585 | [3] | 0 | [4]
Gross Unrealized Holding Loss, Available-for-sale | 0 | [3] | (7,222) | [4]
Investment securities available-for-sale | $ 0 | [3] | $ 0 | [4]
Total Percent, Available-for-sale | 0.00% | [3] | 0.00% | [4]
CMO/REMIC [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost | $ 462,422 |  | $ 471,921 |
Gross Unrealized Holding Gain, Available-for-sale | 0 |  | 0 |
Gross Unrealized Holding Loss, Available-for-sale | (112,812) |  | (120,399) |
Investment securities available-for-sale | $ 349,610 |  | $ 351,522 |
Total Percent, Available-for-sale | 14.06% |  | 13.82% |
Amortized Cost, Held-to-maturity | $ 770,567 |  | $ 784,059 |
Gross Unrealized Holding Gain, Held-to-maturity | 0 |  | 0 |
Gross Unrealized Holding Loss, Held-to-maturity | (160,170) |  | (170,121) |
Fair Value, Held-to-maturity | $ 610,397 |  | $ 613,938 |
Total Percent, Held-to-maturity | 33.11% |  | 32.95% |
[1] | Represents Commercial Property Assessed Clean Energy ("C-PACE") bonds.
[2] | Represents Commercial Property Assessed Clean Energy ("C-PACE") bonds.
[3] | 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 9 for additional information.
[4] | 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 9 for additional information.

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