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Principal Activity and Significant Accounting Policies - Earnings Per Common Share And Incurred But Not Reported Insurance Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Earnings per Common Share          
Dilutive potential common shares     0 0  
Denominators for the basic and diluted earnings per common share 9,611,000 9,209,000 9,587,000 9,151,000  
Accrued expenses and other liabilities          
Incurred but Not Reported Insurance Liability          
Property claim reserves $ 782   $ 782   $ 204