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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | $ 1,064,330 | $ 1,014,626
Equity Securities: | 80,495 | 85,469
Investment in private equity limited partnership | 10,434 | 0
U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,258 | 11,664
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 715,714 | 695,061
Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 303,146 | 287,607
Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 14,039 | 12,371
Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 8,173 | 7,923
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in private equity limited partnership | 10,434 | 0
Total assets accounted for at fair value | 1,155,259 | 1,100,095
Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,258 | 11,664
Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 715,714 | 695,061
Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 303,146 | 287,607
Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 14,039 | 12,371
Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 8,173 | 7,923
Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 15,438 | 15,313
Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 65,057 | 70,156
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in private equity limited partnership | 0 | 0
Total assets accounted for at fair value | 80,495 | 85,469
Level 1 | Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 15,438 | 15,313
Level 1 | Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 65,057 | 70,156
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in private equity limited partnership | 0 | 0
Total assets accounted for at fair value | 1,064,330 | 1,014,626
Level 2 | Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 23,258 | 11,664
Level 2 | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 715,714 | 695,061
Level 2 | Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 303,146 | 287,607
Level 2 | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 14,039 | 12,371
Level 2 | Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 8,173 | 7,923
Level 2 | Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 0 | 0
Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets accounted for at fair value | 10,434 | 0
Level 3 | Fair Value, Measurements, Recurring | U.S. government obligations and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Mortgage-backed and asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Municipal bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Redeemable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities: | $ 0 | $ 0

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