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Business and Summary of Significant Accounting Policies - Credit Quality Indicators (Details)
Dec. 31, 2020
Dec. 31, 2019
FICO Score, Less than 600    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of loan portfolio per FICO score 7.50% 6.70%
FICO Score, 600 to 699    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of loan portfolio per FICO score 79.30% 80.10%
FICO Score, Greater than 700    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage of loan portfolio per FICO score 13.20% 13.20%