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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | $ 82,210 | $ 29,404
Less than 12 months, Unrealized losses | (1,227) | (464)
12 months or longer, Fair value | 560,909 | 596,986
12 months or longer, Unrealized losses | (71,259) | (70,851)
U.S. government obligations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 6,660 | 9,045
Less than 12 months, Unrealized losses | (77) | (108)
12 months or longer, Fair value | 12,090 | 6,811
12 months or longer, Unrealized losses | (717) | (569)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 6,680 | 1,387
Less than 12 months, Unrealized losses | (92) | (9)
12 months or longer, Fair value | 343,383 | 365,893
12 months or longer, Unrealized losses | (35,984) | (37,088)
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 68,579 | 18,150
Less than 12 months, Unrealized losses | (1,055) | (316)
12 months or longer, Fair value | 197,283 | 216,220
12 months or longer, Unrealized losses | (33,424) | (31,967)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 291 | 293
Less than 12 months, Unrealized losses | (3) | (1)
12 months or longer, Fair value | 7,061 | 7,010
12 months or longer, Unrealized losses | (1,017) | (1,069)
Redeemable preferred stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 0 | 529
Less than 12 months, Unrealized losses | 0 | (30)
12 months or longer, Fair value | 1,092 | 1,052
12 months or longer, Unrealized losses | $ (117) | $ (158)

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