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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of available-for-sale investment securities | Our available-for-sale investment securities were as follows:
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (In thousands)
September 30, 2018 |
Negotiable certificate of deposit | $ | 15,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,000 |
Agency bond securities | 19,712 |  |  | — |  |  | (128 | ) |  | 19,584 |
Agency mortgage-backed securities | 114,158 |  |  | 43 |  |  | (1,730 | ) |  | 112,471 |
Municipal bonds | 507 |  |  | — |  |  | (30 | ) |  | 477 |
Asset-backed securities | 76,452 |  |  | 2 |  |  | (109 | ) |  | 76,345 |
Total investment securities | $ | 225,829 |  |  | $ | 45 |  |  | $ | (1,997 | ) |  | $ | 223,877 |
December 31, 2017 |  |  |  |  |  |  |
Corporate bonds | $ | 1,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |
U.S. Treasury notes | 10,921 |  |  | — |  |  | (46 | ) |  | 10,875 |
Agency mortgage-backed securities | 121,037 |  |  | 52 |  |  | (1,055 | ) |  | 120,034 |
Municipal bonds | 742 |  |  | 4 |  |  | (7 | ) |  | 739 |
Asset-backed securities | 20,952 |  |  | — |  |  | (91 | ) |  | 20,861 |
Total investment securities | $ | 154,652 |  |  | $ | 56 |  |  | $ | (1,199 | ) |  | $ | 153,509 |
Note 5—Investment Securities (continued) As of September 30, 2018 and December 31, 2017, the gross unrealized losses and fair values of available-for-sale investment securities that were in unrealized loss positions were as follows:
| Less than 12 months |  | 12 months or more |  | Total fair value |  | Total unrealized loss
| Fair value |  | Unrealized loss |  | Fair value |  | Unrealized loss |  |
| (In thousands)
September 30, 2018 |
Agency bond securities | $ | 19,584 |  |  | $ | (128 | ) |  | $ | — |  |  | $ | — |  |  | $ | 19,584 |  |  | $ | (128 | )
Agency mortgage-backed securities | 32,282 |  |  | (328 | ) |  | 65,414 |  |  | (1,402 | ) |  | 97,696 |  |  | (1,730 | )
Municipal bonds | 346 |  |  | (21 | ) |  | 131 |  |  | (9 | ) |  | 477 |  |  | (30 | )
Asset-backed securities | 55,665 |  |  | (65 | ) |  | 9,259 |  |  | (44 | ) |  | 64,924 |  |  | (109 | )
Total investment securities | $ | 107,877 |  |  | $ | (542 | ) |  | $ | 74,804 |  |  | $ | (1,455 | ) |  | $ | 182,681 |  |  | $ | (1,997 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes | $ | 4,588 |  |  | $ | (21 | ) |  | $ | 6,288 |  |  | $ | (25 | ) |  | $ | 10,876 |  |  | $ | (46 | )
Agency mortgage-backed securities | 62,683 |  |  | (453 | ) |  | 44,159 |  |  | (602 | ) |  | 106,842 |  |  | (1,055 | )
Municipal bonds | — |  |  | — |  |  | 193 |  |  | (7 | ) |  | 193 |  |  | (7 | )
Asset-backed securities | 2,134 |  |  | (2 | ) |  | 18,727 |  |  | (89 | ) |  | 20,861 |  |  | (91 | )
Total investment securities | $ | 69,405 |  |  | $ | (476 | ) |  | $ | 69,367 |  |  | $ | (723 | ) |  | $ | 138,772 |  |  | $ | (1,199 | )
Schedule of maturity dates for available-for-sale investment securities | As of September 30, 2018, the contractual maturities of our available-for-sale investment securities were as follows:
| Amortized cost |  | Fair value
| (In thousands)
Due in one year or less | $ | 14,962 |  |  | $ | 14,946 |
Due after one year through five years | 19,750 |  |  | 19,638 |
Due after five years through ten years | — |  |  | — |
Due after ten years | 507 |  |  | 477 |
Mortgage and asset-backed securities | 190,610 |  |  | 188,816 |
Total investment securities | $ | 225,829 |  |  | $ | 223,877 |

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