How to analyse companies that are in money lending business

I have a small question to analyse companies in lending money. These companies lend money and raise money, the differential in interest of both is basically their profit. The problem that I face is that for these companies the debt is always too high, Is there any basic method to analyse such stocks. E.g Canfin homes.

Please read chapters 17 & 18 of the bookThe Five Rules for Successful Stock Investing by **Pat Dorsey. **It discussed evaluating banks, asset management and insurance businesses.

Thanks Abhishek