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Lease Commitments - Operating and financing leases - (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Lease Commitments    
Operating lease, Within 1 year $ 119 $ 118
Operating lease, After 1 year but within 2 years 117 120
Operating lease, After 2 years but within 3 years 75 98
Operating lease, After 3 years but within 4 years 69 69
Operating lease, After 4 years but within 5 years 69 69
Operating lease, After 5 years 556 589
Total undiscounted cash flows 1,005 1,063
Discount on cash flows (184) (198)
Total lease liabilities 821 865
Financing lease, Within 1 year 295 296
Financing lease, After 1 year but within 2 years 289 275
Financing lease, After 2 years but within 3 years 291 277
Financing lease, After 3 years but within 4 years 264 274
Financing lease, After 4 years but within 5 years 252 236
Financing lease, After 5 years 2,882 3,007
Total undiscounted cash flows 4,273 4,365
Discount on cash flows (1,147) (1,202)
Total lease liabilities $ 3,126 $ 3,163