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Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | $ 3,488 | $ 2,981
U.S. government and federal agency obligations |  | 2,597,737 | 2,555,252
Government-sponsored enterprise obligations |  | 44,148 | 42,849
State and municipal obligations |  | 714,958 | 742,891
Agency mortgage-backed securities |  | 3,356,039 | 3,444,891
Non-agency mortgage-backed securities |  | 499,996 | 568,689
Asset-backed securities |  | 1,496,323 | 1,557,015
Other debt securities |  | 206,578 | 225,266
Trading debt securities |  | 46,630 | 38,034
Equity securities |  | 45,098 | 48,359
Private equity investments |  | 174,070 | 184,386
Derivative Asset | [1] | 74,222 | 62,648
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Total assets |  | 9,281,743 | 9,495,110
Derivative Liabilities | [1] | 23,277 | 26,963
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Total Liabilities |  | 45,733 | 48,812
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 |  | 2,597,737 | 2,555,252
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 |  | 12,941 | 10,219
Equity securities |  | 45,098 | 48,359
Private equity investments |  | 0 | 0
Derivative Asset | [1] | 0 | 0
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Total assets |  | 2,678,232 | 2,635,679
Derivative Liabilities | [1] | 0 | 0
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Total Liabilities |  | 22,456 | 21,849
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value Measurements [Line Items] |  |  |
Residential mortgage loans held for sale |  | 3,488 | 2,981
U.S. government and federal agency obligations |  | 0 | 0
Government-sponsored enterprise obligations |  | 44,148 | 42,849
State and municipal obligations |  | 714,008 | 741,927
Agency mortgage-backed securities |  | 3,356,039 | 3,444,891
Non-agency mortgage-backed securities |  | 499,996 | 568,689
Asset-backed securities |  | 1,496,323 | 1,557,015
Other debt securities |  | 206,578 | 225,266
Trading debt securities |  | 33,689 | 27,815
Equity securities |  | 0 | 0
Private equity investments |  | 0 | 0
Derivative Asset | [1] | 73,882 | 62,555
Assets held in trust for deferred compensation plan |  | 0 | 0
Total assets |  | 6,428,151 | 6,673,988
Derivative Liabilities | [1] | 23,150 | 26,905
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Total Liabilities |  | 23,150 | 26,905
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 | 964
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 |  | 174,070 | 184,386
Derivative Asset | [1] | 340 | 93
Assets held in trust for deferred compensation plan |  | 0 | 0
Total assets |  | 175,360 | 185,443
Derivative Liabilities | [1] | 127 | 58
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Total Liabilities |  | $ 127 | $ 58
[1] | * The fair value of each class of derivative is shown in Note 11.

X
- 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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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