Porfolio lenders

An institution which is lending their own money and originating loans for itself is called a "portfolio lender." This is because they are lending for their own portfolio of loans and not worried about being able to immediately sell them on the secondary market.  Because of this, they don't have to obey Fannie/Freddie guidelines and can create their own rules for determining credit worthiness. . Usually these institutions are larger banks and savings & loans. 

Quite often only a portion of their loan programs are "portfolio" product. If they are offering fixed rate loans or government loans, they are certainly engaging in mortgage banking as well as portfolio lending.

Once a borrower has made the payments on a portfolio loan for over a year without any late payments, the loan is considered to be "seasoned."   Once a loan has a track history of timely payments it becomes marketable, even if it does not meet Freddie/Fannie guidelines.

Selling these "seasoned" loans frees up more money for the "portfolio" lender to make more loans, which is another way that portfolio lenders engage in mortgage banking.  If the loans are sold, they are packaged into pools and sold on the secondary market.  You will probably not even realize your loan is sold because, quite likely, you will still make your loan payments to the same lender, which has now become your "servicer."

Direct Lenders

Lenders are considered to be direct lenders if they fund their own loans. A "direct lender" can range anywhere from the biggest lender to a very tiny one. Banks and savings & loans obviously have deposits they can use to fund loans with, but they usually use "warehouse lines of credit" from which they draw the money to fund the loans. Smaller institutions also have warehouse lines of credit from which they draw  money to fund loans.

Direct lenders usually fit into the category of mortgage bankers or portfolio lenders, but not always.

One way you used to be able to distinguish a direct lender was from the fact that the loan documents were drawn up in their name, but this is no longer the case. Even the tiniest mortgage broker can make arrangements to fund loans in their own name.

Correspondents

Correspondent is usually a term that refers to a company which originates and closes home loans in their own name, then instead of selling those loans in pools, they sell them individually to a larger lender, called a sponsor.   The sponsor acts as the mortgage banker, re-selling the loan to Ginnie Mae, Fannie Mae, or Freddie Mac as part of a pool.

The correspondent may  fund the loans themselves or funding may take place from the larger company. Either way, the loan is usually underwritten by the sponsor.

It is almost like being a mortgage broker, except that there is usually a very strong relationship between the correspondent and their sponsor.

Banks and Savings & Loans - Banks and Savings & Loans - Banks and savings & loans usually operate as portfolio lenders, mortgage bankers, or some combination of both.