German banks have the largest exposure in Europe to Spain- $139.9 billion in 2012. Of this $45.9 billion is exposure to Spanish banks, according to the Bank for International Settlements. The Landesbanks in Germany have a large exposure in covered bonds to Spain, which are covered by collateral in the form of residential mortgages that have lost value and could lead to losses. At the same time they are not likely to default says Leef Dierks of Morgan Stanley, because they are used as collateral to borrow from the ECB. Some of these cedulas or jumbo covered bonds are trading at 52 cents on the dollar, according to Mr. Dierks. Geman banks have limited loss absorption capacity says Moody's. Moody's has reduced Germany's outlook to "negative" from "stable" for this reason, and warned Germany could lose its triple A credit rating.