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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 2,313 |
Due after one year through five years | 25,981 |
Due after five years through ten years | 9,455 |
Due after ten years | 230,153 |
Agency mortgage-backed securities | 693,082 |
Amortized Cost | 960,984 | $ 1,115,323
Available for sale, Estimated Fair Value |  |
Due in one year or less | 2,345 |
Due after one year through five years | 27,058 |
Due after five years through ten years | 9,915 |
Due after ten years | 237,795 |
Agency mortgage-backed securities | 720,991 |
Available for sale, fair value | 998,104 | 1,135,317
Held to maturity, Amortized Cost |  |
Due in one year or less | 0 |
Due after one year through five years | 10,207 |
Due after five years through ten years | 126,285 |
Due after ten years | 82,591 |
Agency mortgage-backed securities | 127,353 |
Amortized Cost | 346,436 | 181,166
Held to maturity, Estimated Fair Value |  |
Due in one year or less | 0 |
Due after one year through five years | 10,597 |
Due after five years through ten years | 133,206 |
Due after ten years | 82,542 |
Agency mortgage-backed securities | 129,794 |
Held to maturity, fair value | $ 356,139 | $ 181,939

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