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Leases - Lease Costs and Maturity Analysis for Liabilities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Option
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Leases      
Right-of-use asset $ 700    
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 $ 438 $ 429 $ 421
Weighted average remaining lease terms in years - operating leases 1 year 9 months 2 years 9 months 3 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%    
2023 $ 447    
2024 340    
Total undiscounted cash flows 787    
Present value lease liability 759 $ 1,159  
Difference between undiscounted cash flows and discounted cash flows $ 28