If you look at the existence of NINJA loan, obviously banks weren't keeping those on their balance sheets. Being able to extend more credit due to an inflated balance sheet doesn't explain banks making loans they knew they wouldn't possibly be able to recover.
I agree - but there's this big ugly tree called subprime loans and it's preventing you from seeing the housing bubble forest that it's in.
Housing prices dropped across the board.... some places worse than others and there's an obvious fallout of suprimers making the banks take the hit, but there are alot more of us who simply gnash our teeth and keep making that mortgage payment because even with the huge drop we still have more equity than the note is worth. That doesn't mean we didn't lose money and that doesn't mean that we aren't affected. Ultimately this is what is responsible for the collapse of the housing market and the ripple effect into the rest of the economy.
Bottom-line, banks shouldn't be legally allowed to finance a bubble. Whether they're loaning money on speculative real estate prices, tech stocks or tulips. The investor should be free to gamble his money in whatever way pleases him. The financier should be more cautious.... especially when it's being financed with my deposits.