Allowance for Loan Losses - Loans by Credit Quality Indicators - Performing and Non-Performing (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Allowance for loan losses
Loans	$ 1,520,351	$ 1,410,060
Consumer Finance
Allowance for loan losses
Loans	437,065	368,194
Consumer Finance | Performing
Allowance for loan losses
Loans	436,601	367,814
Consumer Finance | Non-performing
Allowance for loan losses
Loans	464	380
Consumer Finance | Automobiles
Allowance for loan losses
Loans	381,573	322,067
Consumer Finance | Automobiles | Performing
Allowance for loan losses
Loans	381,109	321,687
Consumer Finance | Automobiles | Non-performing
Allowance for loan losses
Loans	464	380
Consumer Finance | Marine and recreational vehicles
Allowance for loan losses
Loans	55,492	46,127
Consumer Finance | Marine and recreational vehicles | Performing
Allowance for loan losses
Loans	$ 55,492	$ 46,127