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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