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Investments - Estimated Fair Value of Contractual Maturities - Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] |  |
Maturing within one year (remainder of year), Amortized Cost | $ 145 |
Maturing within one year | 0 | $ 145
Maturing after one year through five years | 2,401 | 2,413
Maturing after five years through ten years | 19,362 | 19,895
Maturing after ten years | 155,289 | 155,325
Amortized Cost | 316,422 | 320,073
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Maturing within one year (remainder of year), Fair Value | 145 |
Maturing within one year, Fair Value | 0 | 145
Maturing after one year through five years, Fair Value | 2,358 | 2,384
Maturing after five years through ten years, Fair Value | 17,771 | 18,350
Maturing after ten years, Fair Value | 159,242 | 162,191
Estimated Fair Value | 306,156 | 314,924
Mortgage-Backed Securities [Member] |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] |  |
Securities not due at a single maturity date, Amortized Cost | 139,225 | 142,295
Amortized Cost | 139,225 | 142,295
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] |  |
Securities not due at a single maturity date, Fair Value | 126,640 | 131,854
Estimated Fair Value | $ 126,640 | $ 131,854

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