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INVESTMENT SECURITIES | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
INVESTMENT SECURITIES | INVESTMENT SECURITIES The amortized cost and estimated fair values of available-for-sale securities are as follows (dollar amounts in thousands):
As of December 31, 2016 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government securities funds |  | $ | 1,799 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 1,776 |
Total short-term investment securities |  | $ | 1,799 |  |  | $ | — |  |  | $ | (23 | ) |  | $ | 1,776 |
There were no available for sale securities as of December 31, 2017. During 2017, 2016, and 2015, the proceeds from the sales of available-for-sale securities were $1.8 million, $5,000, and $0.8 million, respectively. During the year ended December 31, 2016, the Company had gross realized gains of $0.3 million on sales of available-for-sale securities (net of tax). There were zero realized gains (losses) on sales of available-for-sales securities (net of tax) for the year ended December 31, 2015. The Company’s trading securities portfolio totaled $2.0 million and $1.4 million at December 31, 2017 and 2016, respectively, and generated gains of $0.2 million, gains of $0.1 million, and losses of $5,000, for the years ended December 31, 2017, 2016, and 2015, respectively.

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