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Leases - Lease Costs and Maturity Analysis for Liabilities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Option
Leases  
Right to use asset $ 1,800
Option to extend the terms true
Number of options to extend | Option 1
Extension term 5 years
Lease Costs  
Operating lease cost $ 419
Lease cost 419
Cash paid for amounts included in the measurement of lease liabilities $ 412
Weighted average remaining lease terms in years - operating leases 4 years 9 months
Weighted average discount rate - operating leases 3.86%
Maturity analysis for liabilities  
Discount rate at commencement 3.86%
2020 $ 421
2021 429
2022 438
2023 447
2024 340
Total undiscounted cash flows 2,075
Present value lease liability 1,890
Difference between undiscounted cash flows and discounted cash flows $ 185