Other lenders show you an exceptional rate, but once you apply for their loss leader rate, you find out it isn't available.
If you put less than 30% down, other lenders may increase your rate.
Most other lenders will increase your rate if your credit score isn't above 740.
First they calculate your debt-to-income ratio. If your income isn't high enough, they increase your rate.
You've probably never heard of "yield spread premium," but other lenders have. If they can bump up your rate, or sell you a higher rate, they receive a bigger commission.
Other lenders increase your rate if you're closing beyond 30 days out. This one trips up many innocent buyers.
This one's too big. This one's too small. But which one is just right? Only they know. To them a small mortgage isn't profitable enough. A loan over $417,000 is a high risk. Both are just excuses to increase your rate.
Most other lenders sell the servicing of your mortgage, so you never know who you'll end up dealing with. Third Federal has never sold the servicing of a single mortgage.