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Fair Value Measurements (Details 2) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Investments in securities that are classified as level 3 |  |  |
Available-for-sale Securities |  | $ 442,929 | $ 447,498
Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Weighted Average [Member] |  |  |
Investments in securities that are classified as level 3 |  |  |
Cumulative Prepayment |  | 2.40% | 2.50%
Cumulative Default |  | 13.60% | 12.40%
Loss Given Default |  | 94.40% | 94.30%
Cure Given Default |  | 60.90% | 60.90%
Pooled trust preferred securities | Significant Unobservable Inputs (Level 3) |  |  |
Investments in securities that are classified as level 3 |  |  |
Available-for-sale Securities |  | $ 1,751 | $ 1,640
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Minimum [Member] |  |  |
Investments in securities that are classified as level 3 |  |  |
Cumulative Prepayment |  | 0.00% | 0.00%
Cumulative Default |  | 5.00% | 5.00%
Loss Given Default |  | 85.00% | 85.00%
Cure Given Default |  | 0.00% | 0.00%
Pooled trust preferred securities | Discounted cash flow methodology [Member] | Significant Unobservable Inputs (Level 3) | Maximum [Member] |  |  |
Investments in securities that are classified as level 3 |  |  |
Cumulative Prepayment |  | 60.00% | 61.00%
Cumulative Default |  | 100.00% | 100.00%
Loss Given Default |  | 100.00% | 100.00%
Cure Given Default |  | 75.00% | 75.00%
Collateral dependent impaired loans | Significant Unobservable Inputs (Level 3) |  |  |
Investments in securities that are classified as level 3 |  |  |
Fair Value | [1] | $ 35,732 | $ 33,567
Other real estate owned and other foreclosed assets | Significant Unobservable Inputs (Level 3) |  |  |
Investments in securities that are classified as level 3 |  |  |
Fair Value | [1] | $ 245 | $ 612
[1] | Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various Level 3 inputs which are not identifiable. Appraisals may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary.

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