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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities $ 78,133 $ 76,995    
Investment securities available for sale 8,274,615 8,829,870    
Loans held for sale 71,535 30,715    
Loans Receivable, Fair Value Disclosure 168,809 275,140    
Residential mortgage servicing rights, at fair value 108,358 109,243 $ 185,017 $ 123,615
Derivative Asset 108,638 38,085    
Total assets measured at fair value 8,810,088 9,360,048    
Junior subordinated debentures, at fair value 330,895 316,440    
Derivative Liability 280,619 261,091    
Total liabilities measured at fair value 611,514 577,531    
Foreign currency derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 542 457    
Derivative Liability 438 355    
Investments in mutual funds and other securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 62,276 63,298    
Equity securities held in rabbi trusts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 15,857 13,697    
U.S. Treasury and agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 1,422,787 1,478,392    
Obligations of states and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 1,026,053 1,072,105    
Mortgage-backed securities and collateralized mortgage obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 5,825,775 6,279,373    
Interest rate lock commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 16      
Derivative Liability 32 137    
Interest rate futures        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 3,745      
Derivative Liability 3,033      
Interest rate forward sales commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 695 9    
Derivative Liability 74 535    
Interest rate swaps        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 107,385 33,874    
Derivative Liability 277,042 260,064    
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 0 0    
Loans Receivable, Fair Value Disclosure 0 0    
Residential mortgage servicing rights, at fair value 0 0    
Total assets measured at fair value 380,971 432,200    
Junior subordinated debentures, at fair value 0 0    
Total liabilities measured at fair value 0 0    
Level 1 | Foreign currency derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability 0 0    
Level 1 | Investments in mutual funds and other securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 43,817 44,839    
Level 1 | Equity securities held in rabbi trusts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 15,857 13,697    
Level 1 | U.S. Treasury and agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 321,297 373,664    
Level 1 | Obligations of states and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 0 0    
Level 1 | Mortgage-backed securities and collateralized mortgage obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 0 0    
Level 1 | Interest rate lock commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0      
Derivative Liability 0 0    
Level 1 | Interest rate futures        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0      
Derivative Liability 0      
Level 1 | Interest rate forward sales commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability 0 0    
Level 1 | Interest rate swaps        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability 0 0    
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 71,535 30,715    
Loans Receivable, Fair Value Disclosure 168,809 275,140    
Residential mortgage servicing rights, at fair value 0 0    
Total assets measured at fair value 8,320,743 8,818,605    
Junior subordinated debentures, at fair value 0 0    
Total liabilities measured at fair value 280,587 260,954    
Level 2 | Foreign currency derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 542 457    
Derivative Liability 438 355    
Level 2 | Investments in mutual funds and other securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 18,459 18,459    
Level 2 | Equity securities held in rabbi trusts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 0 0    
Level 2 | U.S. Treasury and agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 1,101,490 1,104,728    
Level 2 | Obligations of states and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 1,026,053 1,072,105    
Level 2 | Mortgage-backed securities and collateralized mortgage obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 5,825,775 6,279,373    
Level 2 | Interest rate lock commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0      
Derivative Liability 0 0    
Level 2 | Interest rate futures        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 3,745      
Derivative Liability 3,033      
Level 2 | Interest rate forward sales commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 695 9    
Derivative Liability 74 535    
Level 2 | Interest rate swaps        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 107,385 33,874    
Derivative Liability 277,042 260,064    
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans held for sale 0 0    
Loans Receivable, Fair Value Disclosure 0 0    
Residential mortgage servicing rights, at fair value 108,358 109,243    
Total assets measured at fair value 108,374 109,243    
Junior subordinated debentures, at fair value 330,895 316,440    
Total liabilities measured at fair value 330,927 316,577    
Level 3 | Foreign currency derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability 0 0    
Level 3 | Investments in mutual funds and other securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 0 0    
Level 3 | Equity securities held in rabbi trusts        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity and other investment securities 0 0    
Level 3 | U.S. Treasury and agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 0 0    
Level 3 | Obligations of states and political subdivisions        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 0 0    
Level 3 | Mortgage-backed securities and collateralized mortgage obligations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investment securities available for sale 0 0    
Level 3 | Interest rate lock commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 16      
Derivative Liability 32 137    
Level 3 | Interest rate futures        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0      
Derivative Liability 0      
Level 3 | Interest rate forward sales commitments        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability 0 0    
Level 3 | Interest rate swaps        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative Asset 0 0    
Derivative Liability $ 0 $ 0