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Fair Value Measurement and Fair Value of Financial Instruments (Details 3) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Quantitative information |  |
Available-for-sale investment securities | $ 2,956,776 | $ 3,335,795
Derivative assets | 80,466 | 83,780
Other securities |  |
Quantitative information |  |
Available-for-sale investment securities | 147,135 | 40,329
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Available-for-sale investment securities | 115,615 | 0
Derivative assets | 599 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Warrants |  |
Quantitative information |  |
Derivative assets | 599 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other securities |  |
Quantitative information |  |
Available-for-sale investment securities | 115,615 | $ 0
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Recurring | Other securities |  |
Quantitative information |  |
Available-for-sale investment securities | $ 115,615 |
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Recurring | Other securities | Weighted Average |  |
Quantitative information |  |
Discount margin | 1.91% |
Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Warrants |  |
Quantitative information |  |
Derivative assets | $ 599 |
Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Warrants | Weighted Average |  |
Quantitative information |  |
Volatility | 44.00% |
Liquidity discount | 47.00% |

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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