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Restricted Available-for-Sale Investments (Tables) | 3 Months Ended
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Mar. 31, 2023
Investments Debt And Equity Securities [Abstract] |
Reconciliation of Restricted Available-for-sale Investments | The following table reconciles 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 available-for-sale investments as of the periods indicated:
|  | March 31, 2023 |
Dollars in thousands |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Restricted investments |  | $ | 22,968 |  |  | $ | — |  |  | $ | (479 | ) |  | $ | 22,489 |
|  | December 31, 2022 |
Dollars in thousands |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Restricted investments |  | $ | 21,158 |  |  | $ | — |  |  | $ | (742 | ) |  | $ | 20,416 |
Summary of Gross Unrealized Losses And Estimated Fair Values of Restricted Available-For-Sale Investments | The following table includes the gross unrealized losses and estimated fair values of restricted available-for-sale investments that were in a continuous unrealized loss position, for which no allowance for credit loss has been recorded, as of the periods indicated:
|  | March 31, 2023 |
|  | 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 |  | $ | 22,489 |  |  | $ | (479 | ) |  | $ | — |  |  | $ | — |  |  | $ | 22,489 |  |  | $ | (479 | )
|  | December 31, 2022 |
|  | 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 |  | $ | 20,416 |  |  | $ | (742 | ) |  | $ | — |  |  | $ | — |  |  | $ | 20,416 |  |  | $ | (742 | )
Summary of Amortized Cost And Estimated Fair Values of Restricted Available-For-Sale Investments by Contractual Maturity | The following table includes the amortized cost and estimated fair values of restricted available-for-sale investments by contractual maturity as of the periods indicated:
|  | March 31, 2023 |
Dollars in thousands |  | Amortized Cost |  |  | Estimated Fair Value |
Due in one year |  | $ | 4,037 |  |  | $ | 4,020 |
Due within one year to five years |  |  | 18,931 |  |  |  | 18,469 |
Due within five years to ten years |  |  | — |  |  |  | — |
Due after ten years |  |  | — |  |  |  | — |
Total restricted available-for-sale investments |  | $ | 22,968 |  |  | $ | 22,489 |
Summary of Proceeds from Sold or Matured Restricted Available-For-Sale Investments | The following table includes the proceeds from sold or matured restricted available-for-sale investments for the periods indicated:
|  | Three Months Ended |
Dollars in thousands |  | March 31, 2023 |  |  | March 31, 2022 |
Purchase of restricted available-for-sale investments |  | $ | 1,900 |  |  | $ | — |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + 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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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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