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Debt Securities Held-to-Maturity (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract] |
Securities Held-to-Maturity | The following is a summary of debt securities held-to-maturity at March 31, 2019, and December 31, 2018 (in thousands):
| March 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSEs | $ | 9,448 |  |  | $ | — |  |  | $ | 128 |  |  | $ | 9,320 |
Total securities held-to-maturity | $ | 9,448 |  |  | $ | — |  |  | $ | 128 |  |  | $ | 9,320 |
| December 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSEs | $ | 9,505 |  |  | $ | — |  |  | $ | 256 |  |  | $ | 9,249 |
Total securities held-to-maturity | $ | 9,505 |  |  | $ | — |  |  | $ | 256 |  |  | $ | 9,249 |
Held-to-maturity Securities | Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2019 and December 31, 2018, were as follows (in thousands):
| March 31, 2019
| Less than 12 months |  | 12 months or more |  | Total
| Unrealized losses |  | Estimated fair value |  | Unrealized losses |  | Estimated fair value |  | Unrealized losses |  | Estimated fair value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSEs | $ | — |  |  | $ | — |  |  | $ | 128 |  |  | $ | 9,320 |  |  | $ | 128 |  |  | $ | 9,320 |
Total securities held-to-maturity | $ | — |  |  | $ | — |  |  | $ | 128 |  |  | $ | 9,320 |  |  | $ | 128 |  |  | $ | 9,320 |
| December 31, 2018
| Less than 12 months |  | 12 months or more |  | Total
| Unrealized losses |  | Estimated fair value |  | Unrealized losses |  | Estimated fair value |  | Unrealized losses |  | Estimated fair value
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Pass-through certificates: |  |  |  |  |  |  |  |  |  |  |
GSEs | $ | 34 |  |  | $ | 2,133 |  |  | $ | 222 |  |  | $ | 7,116 |  |  | $ | 256 |  |  | $ | 9,249 |
Total securities held-to-maturity | $ | 34 |  |  | $ | 2,133 |  |  | $ | 222 |  |  | $ | 7,116 |  |  | $ | 256 |  |  | $ | 9,249 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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