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Investment Securities - Schedule of Amortized Cost and Fair Value by Contractual Maturity of Investment Securities HTM and AFS (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investment Securities HTM, Fair Value |  |
Total | $ 2,419,349 | $ 2,524,525
Investment Securities AFS, Amortized Cost |  |
Amortized Cost | 7,662,541 | 8,079,918
Investment Securities AFS, Fair Value |  |
Total | 7,411,072 | 7,551,018
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Investment Securities HTM, Amortized Cost |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 2,409,184 |
Total | 2,409,184 |
Investment Securities HTM, Fair Value |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 2,419,349 |
Total | 2,419,349 | 2,524,525
Investment Securities AFS, Amortized Cost |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 2,113,876 |
Amortized Cost | 2,113,876 | 2,294,700
Investment Securities AFS, Fair Value |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 1,961,794 |
Total | 1,961,794 | 2,034,035
U.S. Treasury securities |  |
Investment Securities AFS, Amortized Cost |  |
Within One Year | 212,355 |
1 to 5 Years | 961,112 |
5 to 10 Years | 0 |
More Than 10 Years | 0 |
Amortized Cost | 1,173,467 | 1,214,363
Investment Securities AFS, Fair Value |  |
Within One Year | 213,400 |
1 to 5 Years | 981,707 |
5 to 10 Years | 0 |
More Than 10 Years | 0 |
Total | 1,195,107 | 1,212,742
Mortgage-backed securities issued by U.S. Government agencies |  |
Investment Securities AFS, Amortized Cost |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 1,456,102 |
Amortized Cost | 1,456,102 | 1,583,331
Investment Securities AFS, Fair Value |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 0 |
More Than 10 Years | 1,387,953 |
Total | 1,387,953 | 1,462,790
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Investment Securities AFS, Amortized Cost |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 6,847 |
More Than 10 Years | 580,007 |
Amortized Cost | 586,854 | 657,453
Investment Securities AFS, Fair Value |  |
Within One Year | 0 |
1 to 5 Years | 0 |
5 to 10 Years | 6,771 |
More Than 10 Years | 499,876 |
Total | 506,647 | 550,201
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Investment Securities AFS, Amortized Cost |  |
Within One Year | 50,107 |
1 to 5 Years | 1,743,343 |
5 to 10 Years | 522,173 |
More Than 10 Years | 16,619 |
Amortized Cost | 2,332,242 | 2,290,968
Investment Securities AFS, Fair Value |  |
Within One Year | 49,270 |
1 to 5 Years | 1,768,233 |
5 to 10 Years | 527,523 |
More Than 10 Years | 14,545 |
Total | $ 2,359,571 | $ 2,253,116

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