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Restricted Available-for-Sale Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Reconciliation of Restricted AFS Investments | The following tables reconcile the amortized cost, gross unrealized gains and losses included in accumulated other comprehensive income or loss, and estimated fair value of the Company’s restricted AFS investments as of the periods indicated:
|  | September 30, 2025 |
Dollars in thousands |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Restricted investments |  | $ | 22,355 |  |  | $ | 14 |  |  | $ | (25 | ) |  | $ | 22,344 |
|  | December 31, 2024 |
Dollars in thousands |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Restricted investments |  | $ | 21,633 |  |  | $ | 92 |  |  | $ | (13 | ) |  | $ | 21,712 |
Summary of Gross Unrealized Losses And Estimated Fair Values of Restricted AFS Investments | The following tables include the gross unrealized losses and estimated fair values of restricted AFS investments that were in a continuous unrealized loss position, for which no allowance for credit loss has been recorded, as of the periods indicated:
|  | September 30, 2025 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
Dollars in thousands |  | Estimated Fair Value |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Gross Unrealized Losses |
Restricted investments |  | $ | 2,212 |  |  | $ | (25 | ) |  | $ | — |  |  | $ | — |  |  | $ | 2,212 |  |  | $ | (25 | )
|  | December 31, 2024 |
|  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total |
Dollars in thousands |  | Estimated Fair Value |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Gross Unrealized Losses |
Restricted investments |  | $ | 2,205 |  |  | $ | (13 | ) |  | $ | — |  |  | $ | — |  |  | $ | 2,205 |  |  | $ | (13 | )
Summary of Amortized Cost And Estimated Fair Values of Restricted AFS Investments by Contractual Maturity | The following table includes the amortized cost and estimated fair values of restricted AFS investments by contractual maturity as of the period indicated:
|  | September 30, 2025 |
Dollars in thousands |  | Amortized Cost |  |  | Estimated Fair Value |
Due in one year |  | $ | 20,117 |  |  | $ | 20,132 |
Due within one year to five years |  |  | 2,238 |  |  |  | 2,212 |
Due within five years to ten years |  |  | — |  |  |  | — |
Due after ten years |  |  | — |  |  |  | — |
Total |  | $ | 22,355 |  |  | $ | 22,344 |

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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