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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity and other investment securities $ 79,996   $ 76,995      
Investment securities available for sale 8,676,807   8,829,870      
Loans held for sale 66,639   30,715      
Loans Receivable, Fair Value Disclosure 179,617   275,140      
Residential mortgage servicing rights, at fair value 101,919 $ 110,039 109,243 $ 117,640 $ 172,929 $ 185,017
Derivative Asset 88,218   38,085      
Total assets measured at fair value 9,193,196   9,360,048      
Junior subordinated debentures, at fair value 311,896   316,440      
Derivative Liability 209,996   261,091      
Total liabilities measured at fair value 521,892   577,531      
Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 211   457      
Derivative Liability 108   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 64,118   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 15,878   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 1,496,257   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 1,061,590   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 6,118,960   6,279,373      
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 86          
Derivative Liability 4   137      
Interest rate futures            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 3,745          
Derivative Liability 1,570          
Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 112   9      
Derivative Liability 420   535      
Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 87,809   33,874      
Derivative Liability 207,894   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 429,678   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 45,659   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 15,878   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 368,141   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 66,639   30,715      
Loans Receivable, Fair Value Disclosure 179,617   275,140      
Residential mortgage servicing rights, at fair value 0   0      
Total assets measured at fair value 8,661,513   8,818,605      
Junior subordinated debentures, at fair value 0   0      
Total liabilities measured at fair value 209,992   260,954      
Level 2 | Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 211   457      
Derivative Liability 108   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 1,128,116   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 1,061,590   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 6,118,960   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 1,570          
Level 2 | Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 112   9      
Derivative Liability 420   535      
Level 2 | Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 87,809   33,874      
Derivative Liability 207,894   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 101,919   109,243      
Total assets measured at fair value 102,005   109,243      
Junior subordinated debentures, at fair value 311,896   316,440      
Total liabilities measured at fair value 311,900   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 86          
Derivative Liability 4   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