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Debt (Lines-Of-Credit and Notes Payable, Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 30, 2020
Jul. 01, 2020
Oct. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jun. 25, 2020
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 40,000,000.0     $ 40,000,000.0     $ 50,000,000.0    
Notes payable and other borrowings 0     0          
Repayments of lines of credit       65,597,000 $ 35,731,000        
Prime Rate [Member]                  
Debt Instrument [Line Items]                  
Basis spread on rate   0.10%              
Interest rate   3.40%       4.00%      
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member]                  
Debt Instrument [Line Items]                  
Line of credit, outstanding               $ 60,000,000.0  
Repayments of lines of credit 60,000,000.0                
Fifth Third Syndicated LOC [Member]                  
Debt Instrument [Line Items]                  
Balance $ 50,000,000     $ 50,000,000         $ 30,000,000
Interest rate 2.39%     2.39%         3.85%
Fifth Third Syndicated LOC [Member] | Subsequent Event [Member]                  
Debt Instrument [Line Items]                  
Repayments of lines of credit     $ 20,000,000.0            
Fifth Third Syndicated Term Loan [Member]                  
Debt Instrument [Line Items]                  
Balance $ 95,000,000     $ 95,000,000         $ 98,750,000
Interest rate 2.56%     2.56%         3.71%