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Securities - Investments in Pooled Trust Preferred Securities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 674,104 |
Fair Value | 671,488 | $ 674,248
Trust preferred securities |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 12,442 | 23,749
Fair Value | 9,388 | $ 18,389
Unrealized Loss | (3,054) |
XXIII |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | 8,310 |
Fair Value | 6,086 |
Unrealized Loss | $ (2,224) |
Issuers currently in deferral or default (percent) | 16.00% |
XXVI |  |
Investments in pooled trust preferred securities |  |
Amortized Cost | $ 4,132 |
Fair Value | 3,302 |
Unrealized Loss | $ (830) |
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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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