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Allowance for Loan Losses - Loans by Credit Quality Indicators - Performing and Non-Performing (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Allowance for loan losses    
Loans $ 1,441,609 $ 1,410,060
Consumer Finance    
Allowance for loan losses    
Loans 396,722 368,194
Consumer Finance | Performing    
Allowance for loan losses    
Loans 396,404 367,814
Consumer Finance | Non-performing    
Allowance for loan losses    
Loans 318 380
Consumer Finance | Automobiles    
Allowance for loan losses    
Loans 348,690 322,067
Consumer Finance | Automobiles | Performing    
Allowance for loan losses    
Loans 348,372 321,687
Consumer Finance | Automobiles | Non-performing    
Allowance for loan losses    
Loans 318 380
Consumer Finance | Marine and recreational vehicles    
Allowance for loan losses    
Loans 48,032 46,127
Consumer Finance | Marine and recreational vehicles | Performing    
Allowance for loan losses    
Loans $ 48,032 $ 46,127