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Leases - Lease Costs and Maturity Analysis for Liabilities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Option
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Leases      
Right-of-use asset $ 1,100    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Prepaid Expense and Other Assets    
Option to extend the terms true    
Number of options to extend | Option 1    
Extension term 5 years    
Lease Costs      
Operating lease cost $ 419 $ 419 $ 419
Lease cost 419 419 419
Cash paid for amounts included in the measurement of lease liabilities $ 429 $ 421 $ 412
Weighted average remaining lease terms in years - operating leases 2 years 9 months 3 years 9 months 4 years 9 months
Weighted average discount rate - operating leases 3.86% 3.86% 3.86%
Maturity analysis for liabilities      
Discount rate at commencement 3.86%    
2022 $ 438    
2023 447    
2024 340    
Total undiscounted cash flows 1,225    
Present value lease liability 1,159 $ 1,536  
Difference between undiscounted cash flows and discounted cash flows $ 66