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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2025
Investments [Abstract] |
Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities Available for Sale | The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities at December 31, 2025 and 2024 are summarized below.
|  | December 31, 2025
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities held to maturity: |  |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | $ | 2,409,184 |  |  | $ | 10,165 |  |  | $ | — |  |  | $ | 2,419,349 |
Total investment securities held to maturity(1) |  | $ | 2,409,184 |  |  | $ | 10,165 |  |  | $ | — |  |  | $ | 2,419,349 |
Investment securities available for sale: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 1,173,467 |  |  | $ | 21,640 |  |  | $ | — |  |  | $ | 1,195,107 |
Mortgage-backed securities issued by U.S. Government agencies |  | 1,456,102 |  |  | 16,647 |  |  | (84,796) |  |  | 1,387,953 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | 2,113,876 |  |  | 7,540 |  |  | (159,622) |  |  | 1,961,794 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  | 586,854 |  |  | 14 |  |  | (80,221) |  |  | 506,647 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  | 2,332,242 |  |  | 46,432 |  |  | (19,103) |  |  | 2,359,571 |
Total investment securities available for sale(2) |  | $ | 7,662,541 |  |  | $ | 92,273 |  |  | $ | (343,742) |  |  | $ | 7,411,072 |
|  | December 31, 2024
(in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities held to maturity: |  |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | $ | 2,581,469 |  |  | $ | — |  |  | $ | (56,944) |  |  | $ | 2,524,525 |
Total investment securities held to maturity(1) |  | $ | 2,581,469 |  |  | $ | — |  |  | $ | (56,944) |  |  | $ | 2,524,525 |
Investment securities available for sale: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 1,214,363 |  |  | $ | 3,203 |  |  | $ | (4,824) |  |  | $ | 1,212,742 |
U.S. Government agency securities |  | 29,993 |  |  | — |  |  | (830) |  |  | 29,163 |
Mortgage-backed securities issued by U.S. Government agencies |  | 1,583,331 |  |  | 848 |  |  | (121,389) |  |  | 1,462,790 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | 2,294,700 |  |  | 250 |  |  | (260,915) |  |  | 2,034,035 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  | 657,453 |  |  | — |  |  | (107,252) |  |  | 550,201 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  | 2,290,968 |  |  | 4,724 |  |  | (42,576) |  |  | 2,253,116 |
Corporate debt securities and other debt securities |  | 9,110 |  |  | — |  |  | (139) |  |  | 8,971 |
Total investment securities available for sale(2) |  | $ | 8,079,918 |  |  | $ | 9,025 |  |  | $ | (537,925) |  |  | $ | 7,551,018 |
(1) The amounts reported exclude accrued interest receivable on investment securities HTM of $5.3 million and $5.7 million at December 31, 2025 and 2024, respectively, which is presented as a component of other assets on the consolidated balance sheets. The amortized cost basis of investment securities HTM includes a discount of $(577.1) million and $(649.7) million at December 31, 2025 and 2024, respectively, related to the unamortized portion of unrealized losses on investment securities HTM. (2) The amounts reported exclude accrued interest receivable on investment securities AFS of $28.6 million and $29.5 million at December 31, 2025 and 2024, respectively, which is presented as a component of other assets on the consolidated balance sheets. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 6 - Other Assets" in this Report for more information on other assets.
Schedule of Gross Unrealized Losses on Investment Securities and the Fair Value of the Related Securities | Gross unrealized losses on investment securities AFS and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2025 and 2024 are presented below.
|  | December 31, 2025
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Mortgage-backed securities issued by U.S. Government agencies |  | $ | — |  |  | $ | — |  |  | $ | 591,995 |  |  | $ | (84,796) |  |  | $ | 591,995 |  |  | $ | (84,796) |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | 41,900 |  |  | (70) |  |  | 1,452,621 |  |  | (159,552) |  |  | 1,494,521 |  |  | (159,622) |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  | — |  |  | — |  |  | 479,726 |  |  | (80,221) |  |  | 479,726 |  |  | (80,221) |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  | 68,652 |  |  | (78) |  |  | 281,821 |  |  | (19,025) |  |  | 350,473 |  |  | (19,103) |
Total |  | $ | 110,552 |  |  | $ | (148) |  |  | $ | 2,806,163 |  |  | $ | (343,594) |  |  | $ | 2,916,715 |  |  | $ | (343,742) |
|  | December 31, 2024
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Treasury securities |  | $ | 716,367 |  |  | $ | (4,824) |  |  | $ | — |  |  | $ | — |  |  | $ | 716,367 |  |  | $ | (4,824) |
U.S. Government agency securities |  | — |  |  | — |  |  | 29,163 |  |  | (830) |  |  | 29,163 |  |  | (830) |
Mortgage-backed securities issued by U.S. Government agencies |  | 716,268 |  |  | (8,431) |  |  | 577,468 |  |  | (112,958) |  |  | 1,293,736 |  |  | (121,389) |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  | 456,887 |  |  | (12,503) |  |  | 1,542,618 |  |  | (248,412) |  |  | 1,999,505 |  |  | (260,915) |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  | 29,040 |  |  | (820) |  |  | 521,161 |  |  | (106,432) |  |  | 550,201 |  |  | (107,252) |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  | 1,060,903 |  |  | (10,624) |  |  | 276,850 |  |  | (31,952) |  |  | 1,337,753 |  |  | (42,576) |
Corporate debt securities and other debt securities |  | — |  |  | — |  |  | 8,971 |  |  | (139) |  |  | 8,971 |  |  | (139) |
Total |  | $ | 2,979,465 |  |  | $ | (37,202) |  |  | $ | 2,956,231 |  |  | $ | (500,723) |  |  | $ | 5,935,696 |  |  | $ | (537,925) |
Schedule of Amortized Cost and Fair Value by Contractual Maturity of Investment Securities Available for Sale | The amortized cost and fair value by contractual maturity of investment securities HTM and investment securities AFS at December 31, 2025 are shown below. The expected life of MBSs and CMOs may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the maturity table, MBSs and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date.
| December 31, 2025
(in thousands) | Within One Year |  | 1 to 5 Years |  | 5 to 10 Years |  | More Than 10 Years |  | Total
Investment securities HTM |  |  |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,409,184 |  |  | $ | 2,409,184 |
Fair value | — |  |  | — |  |  | — |  |  | 2,419,349 |  |  | 2,419,349 |
Investment securities AFS |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  |  |  |  |  |  |  |
Amortized cost | $ | 212,355 |  |  | $ | 961,112 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,173,467 |
Fair value | 213,400 |  |  | 981,707 |  |  | — |  |  | — |  |  | 1,195,107 |
Mortgage-backed securities issued by U.S. Government agencies |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | — |  |  | — |  |  | 1,456,102 |  |  | 1,456,102 |
Fair value | — |  |  | — |  |  | — |  |  | 1,387,953 |  |  | 1,387,953 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | — |  |  | — |  |  | 2,113,876 |  |  | 2,113,876 |
Fair value | — |  |  | — |  |  | — |  |  | 1,961,794 |  |  | 1,961,794 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | — |  |  | 6,847 |  |  | 580,007 |  |  | 586,854 |
Fair value | — |  |  | — |  |  | 6,771 |  |  | 499,876 |  |  | 506,647 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | 50,107 |  |  | 1,743,343 |  |  | 522,173 |  |  | 16,619 |  |  | 2,332,242 |
Fair value | 49,270 |  |  | 1,768,233 |  |  | 527,523 |  |  | 14,545 |  |  | 2,359,571 |
Schedule of Specific Identification Method is used to Reclassify Gains and Losses | Gross gains and gross losses on sales of investment securities AFS for the years ended December 31, 2025, 2024, and 2023 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income (loss) at the time of sale.
(in thousands) |  | 2025 |  | 2024 |  | 2023
Gross realized gains on sales |  | $ | 1,744 |  |  | $ | — |  |  | $ | 5,141 |
Gross realized losses on sales |  | (1,040) |  |  | (256,660) |  |  | (81,859) |
Investment securities gains (losses), net |  | $ | 704 |  |  | $ | (256,660) |  |  | $ | (76,718) |

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