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Securities (Scheduled Contractual Maturities of Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 1,100,414 |
Due after one year through five years | 430,577 |
Due after five years through ten years | 185,633 |
Due after ten years | 1,543,160 |
Total available-for-sale debt investment securities, Amortized Cost | 3,259,784 | $ 2,806,900
Fair Value |  |
Due within one year | 1,099,412 |
Due after one year through five years | 429,725 |
Due after five years through ten years | 189,981 |
Due after ten years | 1,564,916 |
Total available-for-sale debt investment securities | 3,284,034 | 2,741,847
Available for sale debt investment securities pledged as collateral, fair value | $ 524,413 | $ 435,833

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