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Fair Value Accounting - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Assets |  |  |
Investment securities available for sale | $ 7,411,072 | $ 7,551,018 |
Mortgage loans held for sale | 36,593 | 33,448 | $ 47,338
Mutual funds and mutual funds held in rabbi trusts | 74,992 | 63,371 |
Derivative assets | 83,960 | 83,895 |
Derivatives Not Designated as Hedging Instruments |  |  |
Liabilities |  |  |
Estimated fair value of derivative liabilities | 113,150 | 201,917 |
Visa Derivative Liability | Derivatives Not Designated as Hedging Instruments |  |  |
Liabilities |  |  |
Estimated fair value of derivative liabilities | 2,940 | 64 |
U.S. Treasury securities |  |  |
Assets |  |  |
Investment securities available for sale | 1,195,107 | 1,212,742 |
Mortgage-backed securities issued by U.S. Government agencies |  |  |
Assets |  |  |
Investment securities available for sale | 1,387,953 | 1,462,790 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 1,961,794 | 2,034,035 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 506,647 | 550,201 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 2,359,571 | 2,253,116 |
Corporate debt securities and other debt securities |  |  |
Assets |  |  |
Investment securities available for sale |  | 8,971 |
Fair Value, Measurements, Recurring |  |  |
Assets |  |  |
Total trading securities | 15,401 | 9,713 |
Investment securities available for sale | 7,411,072 | 7,551,018 |
Mortgage loans held for sale | 36,593 | 33,448 |
Other investments | 17,980 | 14,831 |
Mutual funds and mutual funds held in rabbi trusts | 74,992 | 63,371 |
Derivative assets | 83,960 | 83,895 |
Liabilities |  |  |
Mutual fund held in rabbi trusts | 59,345 | 48,351 |
Derivative liabilities | 110,210 | 216,325 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Assets |  |  |
Total trading securities | 3,011 | 0 |
Investment securities available for sale | 1,195,107 | 1,212,742 |
Mortgage loans held for sale | 0 | 0 |
Other investments | 0 | 0 |
Mutual funds and mutual funds held in rabbi trusts | 74,992 | 63,371 |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Mutual fund held in rabbi trusts | 59,345 | 48,351 |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Assets |  |  |
Total trading securities | 12,390 | 9,713 |
Investment securities available for sale | 6,215,965 | 6,338,276 |
Mortgage loans held for sale | 36,593 | 33,448 |
Other investments | 0 | 0 |
Mutual funds and mutual funds held in rabbi trusts | 0 | 0 |
Derivative assets | 83,960 | 83,895 |
Liabilities |  |  |
Mutual fund held in rabbi trusts | 0 | 0 |
Derivative liabilities | 110,210 | 216,325 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Investment securities available for sale | 0 | 0 |
Mortgage loans held for sale | 0 | 0 |
Other investments | 17,980 | 14,831 |
Mutual funds and mutual funds held in rabbi trusts | 0 | 0 |
Derivative assets | 0 | 0 |
Liabilities |  |  |
Mutual fund held in rabbi trusts | 0 | 0 |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |  |
Assets |  |  |
Total trading securities | 3,011 | 0 |
Investment securities available for sale | 1,195,107 | 1,212,742 |
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 1 |  |  |
Assets |  |  |
Total trading securities | 3,011 | 0 |
Investment securities available for sale | 1,195,107 | 1,212,742 |
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 2 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 3 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | State and municipal securities |  |  |
Assets |  |  |
Total trading securities | 0 | 473 |
Fair Value, Measurements, Recurring | State and municipal securities | Level 1 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Fair Value, Measurements, Recurring | State and municipal securities | Level 2 |  |  |
Assets |  |  |
Total trading securities | 0 | 473 |
Fair Value, Measurements, Recurring | State and municipal securities | Level 3 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Fair Value, Measurements, Recurring | Asset-backed securities |  |  |
Assets |  |  |
Total trading securities | 12,390 | 9,240 |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 1 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 2 |  |  |
Assets |  |  |
Total trading securities | 12,390 | 9,240 |
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3 |  |  |
Assets |  |  |
Total trading securities | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. Government agency securities |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 29,163 |
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 29,163 |
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies |  |  |
Assets |  |  |
Investment securities available for sale | 1,387,953 | 1,462,790 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 1,387,953 | 1,462,790 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 1,961,794 | 2,034,035 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 1,961,794 | 2,034,035 |
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 506,647 | 550,201 |
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 506,647 | 550,201 |
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |  |
Assets |  |  |
Investment securities available for sale | 2,359,571 | 2,253,116 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 2,359,571 | 2,253,116 |
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 8,971 |
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 1 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 0 |
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 2 |  |  |
Assets |  |  |
Investment securities available for sale | 0 | 8,971 |
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 3 |  |  |
Assets |  |  |
Investment securities available for sale | $ 0 | $ 0 |

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