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Investments - Debt and Short-term Investments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Investment Holdings [Line Items] |  |  |  |  |
Other investments | $ 51,018,000 |  | $ 51,018,000 |  | $ 50,501,000
Investment in federal home loan bank stock | us-gaap:AssetPledgedAsCollateralMember |  | us-gaap:AssetPledgedAsCollateralMember |  | us-gaap:AssetPledgedAsCollateralMember
Cash and Short-term Investments |  |  |  |  |
Investment in unconsolidated investees | $ 187,310,000 |  | $ 187,310,000 |  | $ 171,311,000
Cash | 113,044,000 |  | 113,044,000 |  | 88,804,000
Other Investments in Unconsolidated Investees |  |  |  |  |
Cash and Short-term Investments |  |  |  |  |
Investment in unconsolidated investees | 12,300,000 |  | 12,300,000 |  |
Unfunded commitments | 8,600,000 |  | 8,600,000 |  |
Maui Jim Inc. |  |  |  |  |
Cash and Short-term Investments |  |  |  |  |
Investment in unconsolidated investees | 127,400,000 |  | 127,400,000 |  |
Prime Holdings Insurance Services, Inc. (Prime) |  |  |  |  |
Cash and Short-term Investments |  |  |  |  |
Investment in unconsolidated investees | 47,600,000 |  | 47,600,000 |  |
FHLBC |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Investments pledged as collateral | 58,200,000 |  | 58,200,000 |  |
Federal home loan bank borrowings fair value disclosure | 50,000,000.0 |  | 50,000,000.0 |  |
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other investments | 15,100,000 |  | 15,100,000 |  | 16,600,000
Total tax benefit on investments in housing tax credit partnership | 900,000 | $ 900,000 | 1,700,000 | $ 1,800,000 |
Qualified affordable housing project investments, commitment | 1,300,000 |  | 1,300,000 |  |
Investment in Private Funds |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Other investments | 30,300,000 |  | 30,300,000 |  | $ 28,600,000
Fair value investments entities that calculate net asset value per share unfunded commitments | $ 5,900,000 |  | $ 5,900,000 |  |

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