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Investment Securities | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities Our available-for-sale investment securities were as follows:
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (In thousands)
March 31, 2017 |
Corporate bonds | $ | 12,060 |  |  | $ | 5 |  |  | $ | (6 | ) |  | $ | 12,059 |
Commercial paper | 3,885 |  |  | — |  |  | — |  |  | 3,885 |
U.S. Treasury notes | 25,888 |  |  | 1 |  |  | (52 | ) |  | 25,837 |
Mortgage-backed securities | 112,838 |  |  | 204 |  |  | (665 | ) |  | 112,377 |
Municipal bonds | 1,304 |  |  | 1 |  |  | (17 | ) |  | 1,288 |
Asset-backed securities | 28,500 |  |  | 1 |  |  | (138 | ) |  | 28,363 |
Total investment securities | $ | 184,475 |  |  | $ | 212 |  |  | $ | (878 | ) |  | $ | 183,809 |
December 31, 2016 |  |  |  |  |  |  |
Corporate bonds | $ | 21,533 |  |  | $ | 9 |  |  | $ | (7 | ) |  | $ | 21,535 |
Commercial paper | 12,427 |  |  | 4 |  |  | (1 | ) |  | 12,430 |
U.S. Treasury notes | 21,603 |  |  | 1 |  |  | (41 | ) |  | 21,563 |
Agency securities | 4,002 |  |  | — |  |  | (1 | ) |  | 4,001 |
Mortgage-backed securities | 117,990 |  |  | 242 |  |  | (741 | ) |  | 117,491 |
Municipal bonds | 1,460 |  |  | 1 |  |  | (31 | ) |  | 1,430 |
Asset-backed securities | 30,131 |  |  | 1 |  |  | (156 | ) |  | 29,976 |
Total investment securities | $ | 209,146 |  |  | $ | 258 |  |  | $ | (978 | ) |  | $ | 208,426 |
Note 4—Investment Securities (continued) As of March 31, 2017 and December 31, 2016, 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)
March 31, 2017 |
Corporate bonds | $ | 2,221 |  |  | $ | (3 | ) |  | $ | 3,999 |  |  | $ | (3 | ) |  | $ | 6,220 |  |  | $ | (6 | )
U.S. Treasury notes | 21,132 |  |  | (52 | ) |  | — |  |  | — |  |  | 21,132 |  |  | (52 | )
Mortgage-backed securities | 19,346 |  |  | (213 | ) |  | 62,309 |  |  | (452 | ) |  | 81,655 |  |  | (665 | )
Municipal bonds | — |  |  | — |  |  | 821 |  |  | (17 | ) |  | 821 |  |  | (17 | )
Asset-backed securities | 25,158 |  |  | (138 | ) |  | — |  |  | — |  |  | 25,158 |  |  | (138 | )
Total investment securities | $ | 67,857 |  |  | $ | (406 | ) |  | $ | 67,129 |  |  | $ | (472 | ) |  | $ | 134,986 |  |  | $ | (878 | )
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | $ | 8,739 |  |  | $ | (7 | ) |  | $ | 1,999 |  |  | $ | — |  |  | $ | 10,738 |  |  | $ | (7 | )
Commercial paper | 2,672 |  |  | (1 | ) |  | — |  |  | — |  |  | 2,672 |  |  | (1 | )
U.S. Treasury notes | 16,211 |  |  | (41 | ) |  | — |  |  | — |  |  | 16,211 |  |  | (41 | )
Agency securities | 4,002 |  |  | (1 | ) |  | — |  |  | — |  |  | 4,002 |  |  | (1 | )
Mortgage-backed securities | 23,300 |  |  | (236 | ) |  | 61,383 |  |  | (505 | ) |  | 84,683 |  |  | (741 | )
Municipal bonds | — |  |  | — |  |  | 937 |  |  | (31 | ) |  | 937 |  |  | (31 | )
Asset-backed securities | 25,501 |  |  | (156 | ) |  | — |  |  | — |  |  | 25,501 |  |  | (156 | )
Total investment securities | $ | 80,425 |  |  | $ | (442 | ) |  | $ | 64,319 |  |  | $ | (536 | ) |  | $ | 144,744 |  |  | $ | (978 | )
We did not record any other-than-temporary impairment losses during the three months ended March 31, 2017 or 2016 on our available-for-sale investment securities. We do not intend to sell these investments and we have determined that it is more likely than not that we will not be required to sell these investments before recovery of their amortized cost bases, which may be at maturity. As of March 31, 2017, 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 | $ | 24,618 |  |  | $ | 24,605 |
Due after one year through five years | 17,987 |  |  | 17,948 |
Due after five years through ten years | 58 |  |  | 56 |
Due after ten years | 780 |  |  | 765 |
Mortgage and asset-backed securities | 141,032 |  |  | 140,435 |
Total investment securities | $ | 184,475 |  |  | $ | 183,809 |
The expected payments on mortgage-backed and asset-backed securities may not coincide with their contractual maturities because the issuers have the right to call or prepay certain obligations.

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- Definition The entire disclosure for investments, including all tables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 6 -Section 10 -Paragraph (c) -Subparagraph (1) + Details
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