The Federal Home Loan Bank of Boston (FHLBB) has been assigned long-term and short-term Issuer Default Ratings (IDR) of ‘AAA’ and ‘F1+’, respectively, by Fitch.

The rating outlook is stable, according to a statement. Fitch was also assigned an Individual Rating of ‘C’ to FHLBB.

FHLBB has $59 billion in assets and is one of the 12 banks making up the FHLBank System. A significant increase in consolidated obligations and advances during 2007 and 2008 proved the FHLB system provided much needed liquidity to its banking members, which was made possible by its access to the capital markets by virtue of its GSE status.