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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
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Sep. 30, 2019 | Dec. 31, 2018
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 1,222,123 | $ 1,264,529
Fair Value | 1,238,577 | 1,250,777
Unrealized Loss | (4,137) | (18,269)
Trust preferred securities |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 12,160 | 12,359
Fair Value | 9,862 | $ 10,633
Unrealized Loss | (2,298) |
XXIII |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 8,174 |
Fair Value | 6,360 |
Unrealized Loss | $ (1,814) |
Issuers Currently in Deferral or Default | 16.00% |
XXVI |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 3,986 |
Fair Value | 3,502 |
Unrealized Loss | $ (484) |
Issuers Currently in Deferral or Default | 19.00% |

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