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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale, Amortized Cost |  |
Due in one year or less | $ 104,362 |
Due after one year through five years | 345,957 |
Due after five years through ten years | 67,667 |
Due after ten years | 483,137 |
Agency mortgage-backed securities | 727,931 |
Amortized Cost | 1,729,054 | $ 1,358,960
Available for sale, Estimated Fair Value |  |
Due in one year or less | 104,000 |
Due after one year through five years | 318,556 |
Due after five years through ten years | 60,425 |
Due after ten years | 393,422 |
Agency mortgage-backed securities | 659,404 |
Securities available-for-sale | 1,535,807 | 1,366,006
Held to maturity, Amortized Cost |  |
Due in one year or less | 950 |
Due after one year through five years | 41,312 |
Due after five years through ten years | 179,013 |
Due after ten years | 432,357 |
Agency mortgage-backed securities | 57,018 |
Amortized Cost | 710,650 | 430,295
Held to maturity, Estimated Fair Value |  |
Due in one year or less | 949 |
Due after one year through five years | 38,210 |
Due after five years through ten years | 165,304 |
Due after ten years | 373,452 |
Agency mortgage-backed securities | 50,602 |
Held to maturity, fair value | $ 628,517 | $ 434,672

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