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Debt Securities - Maturity Schedule (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Due within one year | $ 68,088 |
Due after one year through five years | 186,292 |
Due after five years through ten years | 250,903 |
Due after ten years | 243,770 |
Total before mortgage-backed securities | 749,053 |
Mortgage-backed securities | 6,579,684 |
Amortized Cost | 7,328,737 | $ 5,145,866
Available-for-Sale, Fair Value |  |
Due within one year | 68,877 |
Due after one year through five years | 195,336 |
Due after five years through ten years | 259,085 |
Due after ten years | 261,936 |
Total before mortgage-backed securities | 785,234 |
Mortgage-backed securities | 6,605,346 |
Debt securities, available-for-sale | 7,390,580 | 5,337,814
Held-to-Maturity, Amortized Cost |  |
Due within one year | 1,529 |
Due after one year through five years | 27,382 |
Due after five years through ten years | 89,010 |
Due after ten years | 1,010,378 |
Total before mortgage-backed securities | 1,128,299 |
Mortgage-backed securities | 0 |
Amortized Cost | 1,128,299 | 189,836
Held-to-Maturity, Fair Value |  |
Due within one year | 1,544 |
Due after one year through five years | 29,114 |
Due after five years through ten years | 94,026 |
Due after ten years | 1,021,769 |
Total before mortgage-backed securities | 1,146,453 |
Mortgage-backed securities | 0 |
Total | $ 1,146,453 | $ 203,216

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