Nationstar Mortgage (NSM), a subsidiary of Nationstar Mortgage Holdings, finalized its acquisition of $63.7 billion in residential mortgage servicing rights and other assets from Aurora Bank FSB, a subsidiary of Aurora Loan Services.

The Aurora portfolio is made up of 75% nonconforming loans in private label securitizations and approximately 25% conforming loans in GSE pools, Nationstar said

The deal has allowed Nationstar to grow its servicing book to about $177 billion, which essentially represents one million new customers.

The transaction was initially announced in March.

Nationstar Mortgage Services closed on a deal earlier this month to buy $16.1 billion in servicing rights previously owned by Aurora Bank. Those rights were linked to loans bundled into Fannie Mae and Freddie Mac loan pools.