Key Insight: Tricolor Holdings specialized in subprime auto loans to undocumented immigrants in the South and Southwest.Supporting Data: The rise in subprime auto loan delinquency rates has been especially pronounced at auto finance companies.Forward Look: Fifth Third is reviewing its risk management protocols to see if it can catch future instances of fraud sooner.Subprime auto lender Tricolor Holdings filed for bankruptcy Wednesday, hours after Fifth Third Bancorp said it is taking a roughly $200 million ...