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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and other investment securities $ 91,580 $ 78,133
Investment securities available for sale 8,228,805 8,274,615
Loans held for sale 64,747 71,535
Loans Receivable, Fair Value Disclosure 174,211 168,809
Residential mortgage servicing rights, at fair value 105,663 108,358
Derivative Asset 90,138 108,638
Total assets measured at fair value 8,755,144 8,810,088
Junior subordinated debentures, at fair value 320,774 330,895
Derivative Liability 226,187 280,619
Total liabilities measured at fair value 546,961 611,514
Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 322 542
Derivative Liability 179 438
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 75,219 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 16,361 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 1,373,033 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 1,020,842 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 5,834,930 5,825,775
Interest rate lock commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 294 16
Derivative Liability 16 32
Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 135 3,033
Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 10 695
Derivative Liability 522 74
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 89,512 107,385
Derivative Liability 225,335 277,042
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 327,901 380,971
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 56,760 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 16,361 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 254,780 321,297
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 Liability 0 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 64,747 71,535
Loans Receivable, Fair Value Disclosure 174,211 168,809
Residential mortgage servicing rights, at fair value 0 0
Total assets measured at fair value 8,321,286 8,320,743
Junior subordinated debentures, at fair value 0 0
Total liabilities measured at fair value 226,171 280,587
Level 2 | Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 322 542
Derivative Liability 179 438
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 1,118,253 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 1,020,842 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 5,834,930 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 Liability 135 3,033
Level 2 | Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 10 695
Derivative Liability 522 74
Level 2 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 89,512 107,385
Derivative Liability 225,335 277,042
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 105,663 108,358
Total assets measured at fair value 105,957 108,374
Junior subordinated debentures, at fair value 320,774 330,895
Total liabilities measured at fair value 320,790 330,927
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 294 16
Derivative Liability 16 32
Level 3 | Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 0 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