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Leases - Right-of-Use Asset and Lease Liability Activity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
ROU Asset    
Balance at beginning of period $ 3,804 $ 4,160
Cash reduction (373) (557)
Noncash decrease (128) 201
Balance at end of period $ 3,303 $ 3,804
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Intangible lease assets and other assets Intangible lease assets and other assets
Lease Liability    
Balance at beginning of period $ 3,837 $ 4,074
Cash reduction (373) (557)
Noncash decrease (134) 320
Balance at end of period $ 3,330 $ 3,837
Operating Lease, Liability, Statement of Financial Position [Extensible List] Accounts payable and accrued liabilities Accounts payable and accrued liabilities