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Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Securities |
Summary of amortized cost and fair value of available-for-sale investment securities portfolios and corresponding amounts of unrealized gains and losses |
|  |  |  | Gross |  | Gross |  |
|  |  |  | Unrealized |  | Unrealized |  |
|  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
|  | (In thousands)
September 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |
Federal agency mortgage-backed securities |  | $ | 10,158 |  | $ | 94 |  | $ | (260) |  | $ | 9,992
Federal agency debt |  |  | 5,427 |  |  | — |  |  | (176) |  |  | 5,251
Total available-for-sale securities |  | $ | 15,585 |  | $ | 94 |  | $ | (436) |  | $ | 15,243
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Federal agency mortgage-backed securities |  | $ | 11,877 |  | $ | 168 |  | $ | (37) |  | $ | 12,008
Federal agency debt |  |  | 5,495 |  |  | 2 |  |  | (11) |  |  | 5,486
Total available-for-sale securities |  | $ | 17,372 |  | $ | 170 |  | $ | (48) |  | $ | 17,494
Summary of securities in unrealized loss positions |
|  | Less than 12 months |  | 12 months or more |  | Total
|  |  |  | Gross |  |  |  | Gross |  | Estimated |  | Gross
|  | Estimated |  | Unrealized |  | Estimated |  | Unrealized |  | Fair |  | Unrealized
|  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Value |  | Losses
|  | (In thousands)
September 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency mortgage-backed securities |  | $ | 6,078 |  | $ | (185) |  | $ | 1,621 |  | $ | (76) |  | $ | 7,699 |  | $ | (261)
Federal agency debt |  |  | 5,252 |  |  | (175) |  |  | — |  |  | — |  |  | 5,252 |  |  | (175)
Total temporarily impaired |  | $ | 11,330 |  | $ | (360) |  | $ | 1,621 |  | $ | (76) |  | $ | 12,951 |  | $ | (436)
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency mortgage-backed securities |  | $ | 4,130 |  | $ | (20) |  | $ | 812 |  | $ | (17) |  | $ | 4,942 |  | $ | (37)
Federal agency debt |  |  | 3,510 |  |  | (11) |  |  | — |  |  | — |  |  | 3,510 |  |  | (11)
Total temporarily impaired |  | $ | 7,640 |  | $ | (31) |  | $ | 812 |  | $ | (17) |  | $ | 8,452 |  | $ | (48)

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