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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 163,297 |
Due after one year through five years | 303,371 |
Due after five years through ten years | 160,265 |
Due after ten years | 383,028 |
Agency mortgage-backed securities | 767,508 |
Amortized Cost | 1,777,469 | $ 1,769,134
Available for sale, Estimated Fair Value |  |
Due in one year or less | 161,711 |
Due after one year through five years | 284,316 |
Due after five years through ten years | 141,132 |
Due after ten years | 320,533 |
Agency mortgage-backed securities | 704,191 |
Fair Value | 1,611,883 | 1,618,273
Held to maturity, Amortized Cost |  |
Due in one year or less | 785 |
Due after one year through five years | 103,383 |
Due after five years through ten years | 176,180 |
Due after ten years | 426,743 |
Agency mortgage-backed securities | 51,276 |
Amortized Cost | 758,367 | 751,219
Held to maturity, Estimated Fair Value |  |
Due in one year or less | 783 |
Due after one year through five years | 96,428 |
Due after five years through ten years | 169,432 |
Due after ten years | 382,634 |
Agency mortgage-backed securities | 45,497 |
Fair Value | $ 694,774 | $ 696,647

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