Bank Earnings

The banks are posting favorable earnings reports. Wells Fargo appears to be earning a profit again (the new accounting rules don't hurt). But i'm curious if these are sustainable profits or a one time (or couple quarter) jump based on the huge number of refinances and incredibly low interest rates encouraging home ownership again (wasn't the sustained low interest rate what caused this problem in the first place...) I will be very interested to see what the profit of the banks looks like in two or three quarters.