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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and other investment securities $ 92,958 $ 78,133
Investment securities available for sale 8,653,172 8,274,615
Loans held for sale 65,590 71,535
Loans Receivable, Fair Value Disclosure 177,949 168,809
Residential mortgage servicing rights, at fair value 102,863 108,358
Derivative Asset 91,789 108,638
Total assets measured at fair value 9,184,321 8,810,088
Junior subordinated debentures, at fair value 323,015 330,895
Derivative Liability 201,757 280,619
Total liabilities measured at fair value 524,772 611,514
Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 494 542
Derivative Liability 403 438
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 75,309 62,276
Equity securities held in rabbi trusts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and other investment securities 17,649 15,857
U.S. Treasury and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,347,060 1,422,787
Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,014,883 1,026,053
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 6,291,229 5,825,775
Interest rate lock commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 478 16
Derivative Liability 43 32
Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 2,791  
Derivative Liability   3,033
Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 26 695
Derivative Liability 597 74
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 88,000 107,385
Derivative Liability 200,714 277,042
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 306,214 380,971
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 56,850 43,817
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 17,649 15,857
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 231,715 321,297
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 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 65,590 71,535
Loans Receivable, Fair Value Disclosure 177,949 168,809
Residential mortgage servicing rights, at fair value 0 0
Total assets measured at fair value 8,774,766 8,320,743
Junior subordinated debentures, at fair value 0 0
Total liabilities measured at fair value 201,714 280,587
Level 2 | Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 494 542
Derivative Liability 403 438
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 1,115,345 1,101,490
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 1,014,883 1,026,053
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 6,291,229 5,825,775
Level 2 | Interest rate lock commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 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 2,791  
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 26 695
Derivative Liability 597 74
Level 2 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 88,000 107,385
Derivative Liability 200,714 277,042
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 102,863 108,358
Total assets measured at fair value 103,341 108,374
Junior subordinated debentures, at fair value 323,015 330,895
Total liabilities measured at fair value 323,058 330,927
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 478 16
Derivative Liability 43 32
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