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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 1,141,627 | $ 686,405
Securities available for sale | 1,150,459 | 674,248
Trust preferred securities |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 12,454 | 23,749
Securities available for sale | 8,960 | $ 18,389
Unrealized Loss | (3,494) |
XXIII |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 8,302 |
Securities available for sale | 5,813 |
Unrealized Loss | $ (2,489) |
Issuers Currently in Deferral or Default (percent) | 15.00% |
XXVI |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 4,152 |
Securities available for sale | 3,147 |
Unrealized Loss | $ (1,005) |
Issuers Currently in Deferral or Default (percent) | 19.00% |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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