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Securities (Scheduled Contractual Maturities of AFS Debt Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,379,762 |
Due after one year through five years | 785,678 |
Due after five years through ten years | 1,483,790 |
Due after ten years | 4,761,912 |
Amortized Cost | 8,411,142 | $ 5,470,523
Fair Value |  |
Due within one year | 1,353,523 |
Due after one year through five years | 790,794 |
Due after five years through ten years | 1,491,799 |
Due after ten years | 4,763,344 |
Total available-for-sale debt investment securities | 8,399,460 | 5,544,658
Available for sale debt investment securities pledged as collateral, fair value | $ 618,081 | $ 588,484

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