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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Investment Securities, Available-for-sale | As of June 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)
June 30, 2018 |
Agency bond securities | $ | 14,904 |  |  | $ | (48 | ) |  | $ | — |  |  | $ | — |  |  | $ | 14,904 |  |  | $ | (48 | )
Agency mortgage-backed securities | 52,114 |  |  | (366 | ) |  | 45,236 |  |  | (1,148 | ) |  | 97,350 |  |  | (1,514 | )
Municipal bonds | 427 |  |  | (12 | ) |  | 156 |  |  | (9 | ) |  | 583 |  |  | (21 | )
Asset-backed securities | 29,436 |  |  | (13 | ) |  | 9,238 |  |  | (68 | ) |  | 38,674 |  |  | (81 | )
Total investment securities | $ | 96,881 |  |  | $ | (439 | ) |  | $ | 54,630 |  |  | $ | (1,225 | ) |  | $ | 151,511 |  |  | $ | (1,664 | )
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 | )
Our available-for-sale investment securities were as follows:
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (In thousands)
June 30, 2018 |
Negotiable certificate of deposit | $ | 20,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 20,000 |
Agency bond securities | 14,952 |  |  | — |  |  | (48 | ) |  | 14,904 |
Agency mortgage-backed securities | 118,350 |  |  | 32 |  |  | (1,514 | ) |  | 116,868 |
Municipal bonds | 604 |  |  | — |  |  | (21 | ) |  | 583 |
Asset-backed securities | 38,756 |  |  | — |  |  | (81 | ) |  | 38,675 |
Total investment securities | $ | 192,662 |  |  | $ | 32 |  |  | $ | (1,664 | ) |  | $ | 191,030 |
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 |
Investments Classified by Contractual Maturity Date | As of June 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 | $ | 15,000 |  |  | $ | 15,000 |
Due after one year through five years | 19,952 |  |  | 19,904 |
Due after five years through ten years | — |  |  | — |
Due after ten years | 604 |  |  | 583 |
Mortgage and asset-backed securities | 157,106 |  |  | 155,543 |
Total investment securities | $ | 192,662 |  |  | $ | 191,030 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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