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Stock-based Payment Arrangements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2009
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum option term | 10 years |  |  |
Award vesting period | 5 years |  |  |
Unrecognized compensation cost | $ 524 |  |  |
Unrecognized compensation cost, period for recognition | 3 years 3 months 18 days |  |  |
Compensation and benefits expense | $ 200 | $ 168 | $ 162 |
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 Awards |  |  |  |
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 (percent) | 4.00% |  |  |
Award vesting period | 5 years |  |  |
Unrecognized compensation cost | $ 1,437 |  |  |
Compensation and benefits expense | 602 | $ 573 | $ 354 |
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 | $ 35 |  |  |
2014 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for grant (shares) | 350,000 |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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