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Securities (Scheduled Contractual Maturities of AFS Debt Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 588,392 |
Due after one year through five years | 314,312 |
Due after five years through ten years | 240,566 |
Due after ten years | 2,517,143 |
Amortized Cost | 3,660,413 | $ 3,320,648
Fair Value |  |
Due within one year | 590,461 |
Due after one year through five years | 319,938 |
Due after five years through ten years | 252,057 |
Due after ten years | 2,533,487 |
Total available-for-sale debt investment securities | 3,695,943 | 3,317,214
Available for sale debt investment securities pledged as collateral, fair value | $ 742,410 | $ 479,432

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