The plans for the merger were announced in March this year.
The merger has created a a mutual savings bank with over $257m of assets, deposits of $205m, loans of $139m, total capital expected to exceed $34m and six banking locations.
Glen Rock Savings Bank will now have branch locations in Glen Rock, Hawthorne, Livingston, West Orange and Wyckoff, in addition to providing its customers with Free internet, mobile banking and bill pay.
Llewellyn-Edison president and CEO Jim Smith previously said: "This combining of resources and shared mutuality speak to the kindred customer service philosophies of Glen Rock Savings and our team at Llewellyn-Edison Savings Bank.
"We look forward to working with Glen Rock Savings as we transition into a new era that will benefit each of the New Jersey communities we will serve."
As per the agreed terms, all Llewellyn-Edison branches will now operate as Glen Rock Savings Bank.
