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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