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Fair Value Accounting - Financial Instruments Measured At Fair Value On A Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets      
Total investment securities available for sale $ 9,788,662 $ 9,678,103  
Mortgage loans held for sale 47,338 51,136 $ 108,198
Mutual funds and mutual funds held in rabbi trusts 53,742 42,659  
Derivative assets 94,903 89,815  
Not Designated As Hedging Instruments      
Liabilities      
Fair value of derivative liabilities 239,821 326,301  
Visa Derivative Liability | Not Designated As Hedging Instruments      
Liabilities      
Fair value of derivative liabilities 589 3,453  
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises      
Assets      
Total investment securities available for sale 587,595 655,127  
U.S. Treasury securities      
Assets      
Total investment securities available for sale 597,629 471,813  
Mortgage-backed securities issued by U.S. Government agencies      
Assets      
Total investment securities available for sale 925,664 792,749  
Mortgage-backed securities issued by U.S. Government sponsored enterprises      
Assets      
Total investment securities available for sale 6,430,379 6,895,070  
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises      
Assets      
Total investment securities available for sale 1,209,783 805,945  
Corporate debt securities and other debt securities      
Assets      
Total investment securities available for sale 8,672 8,601  
Fair Value, Measurements, Recurring      
Assets      
Total trading securities 12,898 8,295  
Total investment securities available for sale 9,788,662 9,678,103  
Mortgage loans held for sale 47,338 51,136  
Other investments 12,560 11,172  
Mutual funds and mutual funds held in rabbi trusts 53,742 42,659  
Derivative assets 94,903 89,815  
Liabilities      
Securities sold short 3,496 3,370  
Mutual fund held in rabbi trusts 38,735 27,944  
Derivative liabilities 259,650 339,227  
Fair Value, Measurements, Recurring | Level 1      
Assets      
Total trading securities 0 0  
Total investment securities available for sale 597,629 471,813  
Mortgage loans held for sale 0 0  
Other investments 0 0  
Mutual funds and mutual funds held in rabbi trusts 53,742 42,659  
Derivative assets 0 0  
Liabilities      
Securities sold short 3,496 3,370  
Mutual fund held in rabbi trusts 38,735 27,944  
Derivative liabilities 0 0  
Fair Value, Measurements, Recurring | Level 2      
Assets      
Total trading securities 12,898 8,295  
Total investment securities available for sale 9,191,033 9,206,290  
Mortgage loans held for sale 47,338 51,136  
Other investments 0 0  
Mutual funds and mutual funds held in rabbi trusts 0 0  
Derivative assets 94,903 89,815  
Liabilities      
Securities sold short 0 0  
Mutual fund held in rabbi trusts 0 0  
Derivative liabilities 259,650 339,227  
Fair Value, Measurements, Recurring | Level 3      
Assets      
Total trading securities 0 0  
Total investment securities available for sale 0 0  
Mortgage loans held for sale 0 0  
Other investments 12,560 11,172  
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 2,910 2,991  
Total investment securities available for sale 587,595 655,127  
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 1      
Assets      
Total trading securities 0 0  
Total 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 2,910 2,991  
Total investment securities available for sale 587,595 655,127  
Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | Level 3      
Assets      
Total trading securities 0 0  
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Other mortgage-backed securities      
Assets      
Total trading securities 2,149 3,185  
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 2,149 3,185  
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 0 48  
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 48  
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 7,839 2,071  
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 7,839 2,071  
Fair Value, Measurements, Recurring | Asset-backed securities | Level 3      
Assets      
Total trading securities 0 0  
Fair Value, Measurements, Recurring | U.S. Treasury securities      
Assets      
Total investment securities available for sale 597,629 471,813  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 1      
Assets      
Total investment securities available for sale 597,629 471,813  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 2      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | U.S. Treasury securities | Level 3      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | U.S. Government agency securities      
Assets      
Total investment securities available for sale 28,940 48,798  
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 1      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 2      
Assets      
Total investment securities available for sale 28,940 48,798  
Fair Value, Measurements, Recurring | U.S. Government agency securities | Level 3      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies      
Assets      
Total investment securities available for sale 925,664 792,749  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 1      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 2      
Assets      
Total investment securities available for sale 925,664 792,749  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government agencies | Level 3      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises      
Assets      
Total investment securities available for sale 6,430,379 6,895,070  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 1      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 2      
Assets      
Total investment securities available for sale 6,430,379 6,895,070  
Fair Value, Measurements, Recurring | Mortgage-backed securities issued by U.S. Government sponsored enterprises | Level 3      
Assets      
Total 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      
Total investment securities available for sale 1,209,783 805,945  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 1      
Assets      
Total 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      
Total investment securities available for sale 1,209,783 805,945  
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | Level 3      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities      
Assets      
Total investment securities available for sale 8,672 8,601  
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 1      
Assets      
Total investment securities available for sale 0 0  
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 2      
Assets      
Total investment securities available for sale 8,672 8,601  
Fair Value, Measurements, Recurring | Corporate debt securities and other debt securities | Level 3      
Assets      
Total investment securities available for sale $ 0 $ 0