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Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity and other investment securities $ 76,361   $ 72,959      
Investment securities available for sale 8,998,428   3,196,166      
Loans held for sale 183,633   71,647      
Loans Receivable, Fair Value Disclosure 282,511   285,581      
Residential mortgage servicing rights, at fair value 172,929 $ 178,800 185,017 $ 179,558 $ 165,807 $ 123,615
Derivative Asset 8,479   15,444      
Total assets measured at fair value 9,722,341   3,826,814      
Junior subordinated debentures, at fair value 312,872   323,639      
Derivative Liability 318,780   271,205      
Total liabilities measured at fair value 631,652   594,844      
Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 242   225      
Derivative Liability 185   185      
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 62,771   61,593      
Equity securities held in rabbi trusts            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity and other investment securities 13,590   11,366      
U.S. Treasury and agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities available for sale 1,489,550   936,174      
Obligations of states and political subdivisions            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Investment securities available for sale 1,063,733   269,800      
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 6,445,145   1,990,192      
Interest rate lock commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 293   50      
Derivative Liability 344   18      
Interest rate futures            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Liability 4,324   392      
Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 576   512      
Derivative Liability 33   601      
Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 7,368   14,657      
Derivative Liability 313,894   270,009      
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 454,619   281,475      
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 44,312   44,256      
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 13,590   11,366      
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 396,717   225,853      
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 183,633   71,647      
Loans Receivable, Fair Value Disclosure 282,511   285,581      
Residential mortgage servicing rights, at fair value 0   0      
Total assets measured at fair value 9,094,500   3,360,272      
Junior subordinated debentures, at fair value 0   0      
Total liabilities measured at fair value 318,436   271,187      
Level 2 | Foreign currency derivatives            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 242   225      
Derivative Liability 185   185      
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   17,337      
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 1,092,833   710,321      
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 1,063,733   269,800      
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 6,445,145   1,990,192      
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 4,324   392      
Level 2 | Interest rate forward sales commitments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 576   512      
Derivative Liability 33   601      
Level 2 | Interest rate swaps            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Asset 7,368   14,657      
Derivative Liability 313,894   270,009      
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 172,929   185,017      
Total assets measured at fair value 173,222   185,067      
Junior subordinated debentures, at fair value 312,872   323,639      
Total liabilities measured at fair value 313,216   323,657      
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 293   50      
Derivative Liability 344   18      
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