The bank maintained that it had little exposure to low-documentation loans, the complaint says.

FORBES: SunTrust Or Untrustworthy For SEC Chair Mary Jo White

The patchy credit histories of subprime and low-documentation borrowers made it hard to model default rates accurately.

ECONOMIST: Rebuilding the banks

Wholesale lenders competed aggressively for market share by undercutting the banks and creating sexy new mortgage products like home-equity, interest-only and low-documentation loans.

FORBES: Still Speculating In Australian Housing: More Punch, Mate!