There is an important U.S. government-sponsored banking system that most people know nothing about. Created by an act of Congress in 1932, the Federal Home Loan Banks (FHLBs) issue bonds that investors perceive as having government backing, and then use the proceeds to make loans to their members: namely, 6,800 commercial banks, credit unions, insurance companies and savings associations. As the name suggests, the mission of the (currently 11) regional, cooperatively owned FHLBs is “to support mortgage lending and related community investment.” But, since the system was founded, its role as an intermediary has changed dramatically.

With assets of roughly $1 trillion, it turns out that the FHLBs—which operate mostly out of the public eye—have been an important source of regulatory arbitrage twice over the past decade. In the first episode—the 2007-09 financial crisis—they partly supplanted the role of the Federal Reserve as the lender of last resort. In the second, the FHLBs became intermediaries between a class of lenders (money market mutual funds) and borrowers (banks), following regulatory changes designed in part to alter the original relationship between these lenders and borrowers. The FHLBs’ new role creates an implicit federal guarantee that increases taxpayers’ risk of loss.

In this post, we highlight these episodes of regulatory arbitrage as unforeseen consequences of a complex financial system and regulatory framework, in combination with the malleability and opaqueness of the FHLB system.…