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Fair Value Accounting - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets      
Investment securities available for sale $ 7,551,018 $ 9,788,662  
Mortgage loans held for sale 33,448 47,338 $ 51,136
Mutual funds and mutual funds held in rabbi trusts 63,371 53,742  
Derivative assets 83,895 94,903  
Not Designated As Hedging Instruments      
Liabilities      
Fair value of derivative liabilities 201,917 239,821  
Visa Derivative Liability | Not Designated As Hedging Instruments      
Liabilities      
Fair value of derivative liabilities 64 589  
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises      
Assets      
Investment securities available for sale 550,201 587,595  
U.S. Treasury securities      
Assets      
Investment securities available for sale 1,212,742 597,629  
Mortgage-backed securities issued by U.S. Government agencies      
Assets      
Investment securities available for sale 1,462,790 925,664  
Mortgage-backed securities issued by U.S. Government sponsored enterprises      
Assets      
Investment securities available for sale 2,034,035 6,430,379  
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises      
Assets      
Investment securities available for sale 2,253,116 1,209,783  
Corporate debt securities and other debt securities      
Assets      
Investment securities available for sale 8,971 8,672  
Fair Value, Measurements, Recurring      
Assets      
Total trading securities 9,713 12,898  
Investment securities available for sale 7,551,018 9,788,662  
Mortgage loans held for sale 33,448 47,338  
Other investments 14,831 12,560  
Mutual funds and mutual funds held in rabbi trusts 63,371 53,742  
Derivative assets 83,895 94,903  
Liabilities      
Securities sold short 0 3,496  
Mutual fund held in rabbi trusts 48,351 38,735  
Derivative liabilities 216,325 259,650  
Fair Value, Measurements, Recurring | Level 1      
Assets      
Total trading securities 0 0  
Investment securities available for sale 1,212,742 597,629  
Mortgage loans held for sale 0 0  
Other investments 0 0  
Mutual funds and mutual funds held in rabbi trusts 63,371 53,742  
Derivative assets 0 0  
Liabilities      
Securities sold short 0 3,496  
Mutual fund held in rabbi trusts 48,351 38,735  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring | Level 2      
Assets      
Total trading securities 9,713 12,898  
Investment securities available for sale 6,338,276 9,191,033  
Mortgage loans held for sale 33,448 47,338  
Other investments 0 0  
Mutual funds and mutual funds held in rabbi trusts 0 0  
Derivative assets 83,895 94,903  
Liabilities      
Securities sold short 0 0  
Mutual fund held in rabbi trusts 0 0  
Derivative liabilities 216,325 259,650  
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 14,831 12,560  
Mutual funds and mutual funds held in rabbi trusts 0 0  
Derivative assets 0 0  
Liabilities      
Securities sold short 0 0  
Mutual fund held in rabbi trusts 0 0  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises      
Assets      
Total trading securities 0 2,910  
Investment securities available for sale 550,201 587,595  
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 1      
Assets      
Total trading securities 0 0  
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      
Total trading securities 0 2,910  
Investment securities available for sale 550,201 587,595  
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 3      
Assets      
Total trading securities 0 0  
Investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Other mortgage-backed securities      
Assets      
Total trading securities 0 2,149  
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 1      
Assets      
Total trading securities 0 0  
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 2      
Assets      
Total trading securities 0 2,149  
Fair Value, Measurements, Recurring | Other mortgage-backed securities | Level 3      
Assets      
Total trading securities 0 0  
Fair Value, Measurements, Recurring | State and municipal securities      
Assets      
Total trading securities 473 0  
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 473 0  
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 9,240 7,839  
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 9,240 7,839  
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3      
Assets      
Total trading securities 0 0  
Fair Value, Measurements, Recurring | U.S. Treasury securities      
Assets      
Investment securities available for sale 1,212,742 597,629  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 1      
Assets      
Investment securities available for sale 1,212,742 597,629  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 2      
Assets      
Investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 3      
Assets      
Investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | U.S. Government agency securities      
Assets      
Investment securities available for sale 29,163 28,940  
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 29,163 28,940  
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 1,462,790 925,664  
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 1,462,790 925,664  
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 2,034,035 6,430,379  
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 2,034,035 6,430,379  
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 | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises      
Assets      
Investment securities available for sale 2,253,116 1,209,783  
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 2,253,116 1,209,783  
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 8,971 8,672  
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 8,971 8,672  
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 3      
Assets      
Investment securities available for sale $ 0 $ 0