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Investments - Estimated Fair Value of Contractual Maturities - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Maturing within one year (remainder of year), Amortized Cost | $ 2,200 |
Maturing within one year, Amortized Cost | 0 | $ 583
Maturing after one year through five years, Amortized Cost | 22,034 | 40,187
Maturing after five years through ten years, Amortized Cost | 102,687 | 156,541
Maturing after ten years, Amortized Cost | 55,021 | 170,842
Amortized Cost | 759,222 | 1,041,925
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Maturing within one year (remainder of year), Fair Value | 2,202 |
Maturing within one year, Fair Value | 0 | 582
Maturing after one year through five years, Fair Value | 21,914 | 39,916
Maturing after five years through ten years, Fair Value | 92,029 | 143,516
Maturing after ten years, Fair Value | 48,626 | 164,981
Fair Value | 741,789 | 1,019,201
Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Securities not due at a single maturity date, Amortized Cost | 14,181 | 100,745
Amortized Cost | 14,181 | 100,745
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Securities not due at a single maturity date, Fair Value | 13,448 | 99,544
Fair Value | 13,448 | 99,544
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract] |  |
Securities not due at a single maturity date, Amortized Cost | 563,099 | 573,027
Amortized Cost | 563,099 | 573,027
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Securities not due at a single maturity date, Fair Value | 563,570 | 570,662
Fair Value | $ 563,570 | $ 570,662

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