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Leases (Summary of Lease Costs and Other Lease Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Costs:    
Operating lease costs $ 2,673 $ 2,758
Variable lease costs [1] 410 428
Sublease income (46) (46)
Net lease costs 3,037 3,140
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 2,599 2,641
Initial recognition of operating lease right of use assets   23,275
Initial recognition of operating lease liabilities   23,985
Right of use assets obtained in exchange for new operating lease liabilities $ 477 $ 620
[1]

Variable lease costs primarily represent variable payments such as common area maintenance, insurance, taxes and utilities.