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Investment Securities - Debt Maturities (Details) - Debt Securities - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,235,047 |
Due after one year through five years | 364,971 |
Due after five years through ten years | 922,322 |
Due after ten years | 936,617 |
Amortized Cost | 3,458,957 | $ 2,961,430
Fair Value |  |
Due within one year | 1,241,040 |
Due after one year through five years | 364,927 |
Due after five years through ten years | 926,675 |
Due after ten years | 934,736 |
Total | $ 3,467,378 | $ 2,959,843
Weighted- Average Yield |  |
Due within one year | 1.58% |
Due after one year through five years | 0.99% |
Due after five years through ten years | 0.72% |
Due after ten years | 0.69% |
Total | 1.05% |

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