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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Investments in pooled trust preferred securities |  |  |
Amortized Cost | $ 1,106,028 | $ 674,104 | $ 2,946
Fair Value | 1,088,779 | 671,488 |
Trust preferred securities |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | 12,402 | 12,442 |
Fair Value | 10,401 | $ 9,388 |
Unrealized Loss | (2,001) |  |
XXIII |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | 8,313 |  |
Fair Value | 6,751 |  |
Unrealized Loss | $ (1,562) |  |
Issuers Currently in Deferral or Default | 16.00% |  |
XXVI |  |  |
Investments in pooled trust preferred securities |  |  |
Amortized Cost | $ 4,089 |  |
Fair Value | 3,650 |  |
Unrealized Loss | $ (439) |  |
Issuers Currently in Deferral or Default | 19.00% |  |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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