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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity and other investment securities $ 77,221   $ 76,995      
Investment securities available for sale 8,503,000   8,829,870      
Loans held for sale 56,310   30,715      
Loans Receivable, Fair Value Disclosure 174,021   275,140      
Residential mortgage servicing rights, at fair value 110,039 $ 110,444 109,243 $ 172,929 $ 178,800 $ 185,017
Derivative Asset 118,288   38,085      
Total assets measured at fair value 9,038,879   9,360,048      
Junior subordinated debentures, at fair value 310,187   316,440      
Derivative Liability 312,542   261,091      
Total liabilities measured at fair value 622,729   577,531      
Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 230   457      
Derivative Liability 155   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 62,154   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 15,067   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 1,467,222   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 1,034,523   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 6,001,255   6,279,373      
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Liability 452   137      
Interest rate futures            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 3,745          
Derivative Liability 500          
Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 178   9      
Derivative Liability 243   535      
Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 117,880   33,874      
Derivative Liability 311,192   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 433,429   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 43,695   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 15,067   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 374,667   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 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 56,310   30,715      
Loans Receivable, Fair Value Disclosure 174,021   275,140      
Residential mortgage servicing rights, at fair value 0   0      
Total assets measured at fair value 8,495,411   8,818,605      
Junior subordinated debentures, at fair value 0   0      
Total liabilities measured at fair value 312,090   260,954      
Level 2 | Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 230   457      
Derivative Liability 155   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 1,092,555   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 1,034,523   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 6,001,255   6,279,373      
Level 2 | Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
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 500          
Level 2 | Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 178   9      
Derivative Liability 243   535      
Level 2 | Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 117,880   33,874      
Derivative Liability 311,192   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 110,039   109,243      
Total assets measured at fair value 110,039   109,243      
Junior subordinated debentures, at fair value 310,187   316,440      
Total liabilities measured at fair value 310,639   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 Liability 452   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