Leases - Lease Costs and Maturity Analysis for Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases
Right-of-use asset	$ 300
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Prepaid Expense and Other Assets
Lease Costs
Operating lease cost	$ 419	$ 419	$ 419
Lease cost	419	419	419
Cash paid for amounts included in the measurement of lease liabilities	$ 447	$ 438	$ 429
Weighted average remaining lease terms in years - operating leases	9 months	1 year 9 months	2 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%
2024	$ 340
Total undiscounted cash flows	340
Present value lease liability	334	$ 759
Difference between undiscounted cash flows and discounted cash flows	$ 6