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Fair Value of Financial Instruments (Amortized Cost Basis by Year of Origination and Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 $ 0  
2020 5,524  
2019 16,876  
2018 25,170  
Total 47,570 $ 47,690
Current-period write-offs 0  
Current-period recoveries 0  
Current-period net write-offs 0  
1-2 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 5,524  
2019 8,380  
2018 18,582  
Total 32,486  
3-4 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 8,496  
2018 6,588  
Total 15,084  
5 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
Total 0  
6 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
Total 0  
7 internal grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
2021 0  
2020 0  
2019 0  
2018 0  
Total $ 0