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Investment Securities Investment Securities Maturity Schedule (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale, Amortized Cost |  |  |
Due within one year |  | $ 69,596 |
Due after one year through five years |  | 228,415 |
Due after five years through ten years |  | 228,766 |
Due after ten years |  | 354,443 |
Total before mortgage-backed securities |  | 881,220 |
Total |  | 1,771,504 | $ 2,422,802
Available-for-Sale, Fair Value |  |  |
Due with one year |  | 69,650 |
Due after one year through five years |  | 228,881 |
Due after five years through ten years |  | 236,318 |
Due after ten years |  | 361,632 |
Total before mortgage-backed securities |  | 896,481 |
Total |  | 1,778,243 | 2,425,477
Held-to-Maturity, Amortized Cost |  |  |
Due within one year |  | 0 |
Due after one year through five years |  | 2,108 |
Due after five years through ten years |  | 86,741 |
Due after ten years |  | 559,464 |
Total before mortgage-backed securities |  | 648,313 |
Amortized Cost |  | 648,313 | 675,674
Held-to-Maturity, Fair Value |  |  |
Due within one year |  | 0 |
Due after one year through five years |  | 2,136 |
Due after five years through ten years |  | 88,264 |
Due after ten years |  | 569,686 |
Total before mortgage-backed securities |  | 660,086 |
Total |  | 660,086 | $ 689,089
Mortgage-backed securities |  |  |
Available-for-Sale, Amortized Cost |  |  |
Mortgage-backed securities | [1] | 890,284 |
Available-for-Sale, Fair Value |  |  |
Mortgage-backed securities | [1] | 881,762 |
Held-to-Maturity, Amortized Cost |  |  |
Mortgage-backed securities | [1] | 0 |
Held-to-Maturity, Fair Value |  |  |
Mortgage-backed securities | [1] | $ 0 |
[1] | Mortgage-backed securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the next rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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