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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | $ 1,657 | $ 4,028
U.S. government and federal agency obligations |  | 3,147,293 | 3,279,100
Government-sponsored enterprise obligations |  | 43,985 | 44,712
State and municipal obligations |  | 654,824 | 664,733
Agency mortgage-backed securities |  | 3,123,669 | 3,223,105
Non-agency mortgage-backed securities |  | 414,777 | 435,688
Asset-backed securities |  | 1,093,819 | 1,262,045
Other debt securities |  | 167,760 | 186,130
Trading debt securities |  | 44,329 | 40,080
Equity securities |  | 46,193 | 47,551
Private equity investments |  | 183,764 | 184,343
Derivative Asset | [1] | 58,399 | 51,421
Assets held in trust for deferred compensation plan |  | 22,437 | 23,276
Total assets |  | 9,002,906 | 9,446,212
Derivative Liabilities | [1] | 15,726 | 18,795
Liabilities held in trust for deferred compensation plan |  | 22,437 | 23,276
Total Liabilities |  | 38,163 | 42,071
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | 0 | 0
U.S. government and federal agency obligations |  | 3,147,293 | 3,279,100
Government-sponsored enterprise obligations |  | 0 | 0
State and municipal obligations |  | 0 | 0
Agency mortgage-backed securities |  | 0 | 0
Non-agency mortgage-backed securities |  | 0 | 0
Asset-backed securities |  | 0 | 0
Other debt securities |  | 0 | 0
Trading debt securities |  | 13,233 | 13,215
Equity securities |  | 46,193 | 47,551
Private equity investments |  | 0 | 0
Derivative Asset | [1] | 0 | 0
Assets held in trust for deferred compensation plan |  | 22,437 | 23,276
Total assets |  | 3,229,156 | 3,363,142
Derivative Liabilities | [1] | 0 | 0
Liabilities held in trust for deferred compensation plan |  | 22,437 | 23,276
Total Liabilities |  | 22,437 | 23,276
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | 1,657 | 4,028
U.S. government and federal agency obligations |  | 0 | 0
Government-sponsored enterprise obligations |  | 43,985 | 44,712
State and municipal obligations |  | 653,874 | 663,781
Agency mortgage-backed securities |  | 3,123,669 | 3,223,105
Non-agency mortgage-backed securities |  | 414,777 | 435,688
Asset-backed securities |  | 1,093,819 | 1,262,045
Other debt securities |  | 167,760 | 186,130
Trading debt securities |  | 31,096 | 26,865
Equity securities |  | 0 | 0
Private equity investments |  | 0 | 0
Derivative Asset | [1] | 58,216 | 51,232
Assets held in trust for deferred compensation plan |  | 0 | 0
Total assets |  | 5,588,853 | 5,897,586
Derivative Liabilities | [1] | 15,666 | 18,718
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Total Liabilities |  | 15,666 | 18,718
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | 0 | 0
U.S. government and federal agency obligations |  | 0 | 0
Government-sponsored enterprise obligations |  | 0 | 0
State and municipal obligations |  | 950 | 952
Agency mortgage-backed securities |  | 0 | 0
Non-agency mortgage-backed securities |  | 0 | 0
Asset-backed securities |  | 0 | 0
Other debt securities |  | 0 | 0
Trading debt securities |  | 0 | 0
Equity securities |  | 0 | 0
Private equity investments |  | 183,764 | 184,343
Derivative Asset | [1] | 183 | 189
Assets held in trust for deferred compensation plan |  | 0 | 0
Total assets |  | 184,897 | 185,484
Derivative Liabilities | [1] | 60 | 77
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Total Liabilities |  | $ 60 | $ 77
[1] | * The fair value of each class of derivative is shown in Note 12.

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- Definition The fair value as of the balance sheet date of firm holdings in Agency mortgage-backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the agency mortgage-backed security). + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in non-agency mortgage-backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the non-agency mortgage-backed security). + References No definition available. + Details
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