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Summary of Significant Accounting Policies - Disclosures of Cash Flow Information and Non-cash Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Interest $ 4,856 $ 6,533
Income taxes 186 131
Non-cash transactions:    
Assets acquired in settlement of loans 1,388 1,340
Reissuance of treasury stock as compensation $ 449 $ 42