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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Investments in pooled trust preferred securities |  |  |
Amortized Cost | $ 961,589 | $ 674,104 | $ 2,496
Fair Value | 948,365 | 671,488 |
Trust preferred securities |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | 12,429 | 12,442 |
Fair Value | 10,045 | $ 9,388 |
Unrealized Loss | (2,384) |  |
XXIII |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | 8,318 |  |
Fair Value | 6,527 |  |
Unrealized Loss | $ (1,791) |  |
Issuers Currently in Deferral or Default | 16.00% |  |
XXVI |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | $ 4,111 |  |
Fair Value | 3,518 |  |
Unrealized Loss | $ (593) |  |
Issuers Currently in Deferral or Default | 19.00% |  |

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