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Securities Held-to-Maturity | 12 Months Ended
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Dec. 31, 2022
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Securities Held-to-Maturity | 7. Securities Held-to-Maturity The following table is a summary of the Company’s securities held-to-maturity:
|  | December 31, 2022 |  |  | December 31, 2021 |
Debt instruments: Pass-through GSEs (amortized cost) |  | $ | 259 |  |  | $ | 308 |
During the years ended December 31, 2022 and 2021, the Company received proceeds of $45 and $136, respectively, from held-to-maturity securities maturing or being called prior to maturity. The following table summarizes unrealized gains, losses, and fair value (classified as Level 2 within the fair value hierarchy) of securities held-to-maturity:
|  | December 31,
|  | 2022 |  | 2021
Cost/amortized cost |  | $ | 259 |  |  | $ | 308 |
Gross unrealized losses |  |  | (20 | ) |  |  | — |
Gross unrealized gains |  |  | — |  |  |  | 13 |
Fair value |  | $ | 239 |  |  | $ | 321 |
An allowance for credit losses was not provided on the Company’s held-to-maturity securities as all securities are investments in pass-through GSEs which are determined to have an estimated loss rate of zero due to an implicit U.S. government guarantee. The following table sets forth the maturity profile of the securities held-to-maturity; however, these securities may be called prior to maturity date:
|  | December 31,
|  | 2022 |  | 2021
Due within one year |  | $ | — |  |  | $ | — |
Due one year through five years |  |  | — |  |  |  | — |
Due five years through ten years |  |  | 27 |  |  |  | — |
Due over ten years |  |  | 232 |  |  |  | 308 |
Total |  | $ | 259 |  |  | $ | 308 |

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