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Stock-based Payment Arrangements - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 05, 2021 | Dec. 31, 2020 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum option term (in years) | 10 years |  |  |  |  |
Options outstanding (in shares) | 156,687 | 181,383 | 213,857 |  | 204,540 |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |  |
Unrecognized compensation cost | $ 204 |  |  |  |  |
Unrecognized compensation cost, period for recognition (in years) | 2 years 3 months 18 days |  |  |  |  |
Compensation and benefits expense | $ 144 | $ 187 | $ 220 |  |  |
2009 Stock Option Plan | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares issuable under the Stock Option Plan | 892,687 |  |  |  |  |
2009 Recognition and Retention Plan | Restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of shares issuable under the Stock Option Plan | 357,075 |  |  |  |  |
Percent of outstanding common to be approved for restricted stock awards under the RRP (as percent) | 4.00% |  |  |  |  |
Award vesting period (in years) | 5 years |  |  |  |  |
Unrecognized compensation cost | $ 2,484 |  |  |  |  |
Compensation and benefits expense | 762 | $ 625 | $ 549 |  |  |
Average cost of shares in open market required to fund the 2009 plan (in usd per share) |  |  |  |  |  | $ 11.81
Total cost of shares held by the 2009 plan | $ 1 |  |  |  |  |
2014 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) | 350,000 |  |  | 435,000 |  |

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