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Allowance for Loan Losses - Loans by Credit Quality Indicators - Performing and Non-Performing (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Allowance for loan losses    
Loans $ 1,387,244 $ 1,352,406
Consumer finance    
Allowance for loan losses    
Loans 332,873 312,252
Consumer finance | Performing    
Allowance for loan losses    
Loans 332,735 311,850
Consumer finance | Non-Performing    
Allowance for loan losses    
Loans $ 138 $ 402