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Securities (Scheduled Maturities of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Due within one year | $ 573,138 |
Due after one year through five years | 818,412 |
Due after five years through ten years | 188,149 |
Due after ten years | 1,311,194 |
Total available-for-sale investment securities | 2,890,893 |
Fair Value |  |
Due within one year | 549,190 |
Due after one year through five years | 796,717 |
Due after five years through ten years | 184,944 |
Due after ten years | 1,280,565 |
Total available-for-sale investment securities | 2,811,416 | $ 3,016,752
Fair values of available-for-sale investment securities pledged | $ 498,700 | $ 534,300

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