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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Values of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Investment securities held to maturity: |  |
Amortized Cost | $ 2,409,184 | $ 2,581,469
Gross Unrealized Gains | 10,165 | 0
Gross Unrealized Losses | 0 | (56,944)
Fair Value | 2,419,349 | 2,524,525
Investment securities available for sale: |  |
Amortized Cost | 7,662,541 | 8,079,918
Gross Unrealized Gains | 92,273 | 9,025
Gross Unrealized Losses | (343,742) | (537,925)
Fair Value | 7,411,072 | 7,551,018
Accrued interest receivable on investment securities held to maturity | $ 5,300 | $ 5,700
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Discount included in amortized cost of investment securities HTM | $ (577,100) | $ (649,700)
Accrued interest receivable on investment securities available for sale | $ 28,600 | $ 29,500
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
U.S. Treasury securities |  |
Investment securities available for sale: |  |
Amortized Cost | $ 1,173,467 | $ 1,214,363
Gross Unrealized Gains | 21,640 | 3,203
Gross Unrealized Losses | 0 | (4,824)
Fair Value | 1,195,107 | 1,212,742
U.S. Government agency securities |  |
Investment securities available for sale: |  |
Amortized Cost |  | 29,993
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (830)
Fair Value |  | 29,163
Mortgage-backed securities issued by U.S. Government agencies |  |
Investment securities available for sale: |  |
Amortized Cost | 1,456,102 | 1,583,331
Gross Unrealized Gains | 16,647 | 848
Gross Unrealized Losses | (84,796) | (121,389)
Fair Value | 1,387,953 | 1,462,790
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |
Investment securities held to maturity: |  |
Amortized Cost | 2,409,184 | 2,581,469
Gross Unrealized Gains | 10,165 | 0
Gross Unrealized Losses | 0 | (56,944)
Fair Value | 2,419,349 | 2,524,525
Investment securities available for sale: |  |
Amortized Cost | 2,113,876 | 2,294,700
Gross Unrealized Gains | 7,540 | 250
Gross Unrealized Losses | (159,622) | (260,915)
Fair Value | 1,961,794 | 2,034,035
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |
Investment securities available for sale: |  |
Amortized Cost | 586,854 | 657,453
Gross Unrealized Gains | 14 | 0
Gross Unrealized Losses | (80,221) | (107,252)
Fair Value | 506,647 | 550,201
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |
Investment securities available for sale: |  |
Amortized Cost | 2,332,242 | 2,290,968
Gross Unrealized Gains | 46,432 | 4,724
Gross Unrealized Losses | (19,103) | (42,576)
Fair Value | $ 2,359,571 | 2,253,116
Corporate debt securities and other debt securities |  |
Investment securities available for sale: |  |
Amortized Cost |  | 9,110
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (139)
Fair Value |  | $ 8,971

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