As we have previously reported, on September 10, 2012, we announced that we had executed a merger agreement that provided for the acquisition of WSB Holdings, Inc. We plan to complete the merger during the second quarter of 2013. Until completion, we anticipate that we will continue to incur merger related expenses that may cause earnings to be slightly lower than would otherwise be expected. However, we anticipate the WSB merger will be accretive to earnings within three quarters of closing. This combination will create a $1.2 billion banking institution and will allow us to expand our financial services with the addition of a successful and growing mortgage origination team. We also anticipate that the acquisition and integration of WSB will enhance the liquidity of our stock as well as our overall financial condition and operating performance.
Asset quality continues to remain strong even with the addition of the acquired loan portfolio. Non-performing assets to total assets remained stable and statistically low at 1.12% at December 31, 2012 compared to 1.22% at December 31, 2011 and the allowance for loan losses as a percent of gross loans decreased modestly to 0.66% compared to 0.69% at December 31, 2011. The entire loan portfolio's asset quality remained relatively stable and we have seen no significant increase in the delinquency. As a result, we had a slightly decreased provision expense for the 2012 year and fourth quarter. Based on our internal analysis, the ratio of non-performing assets to total assets, and the satisfactory historical performance of the loan portfolio, management believes the allowance continues to appropriately reflect the inherent risk of loss in our portfolio and the current economic climate. However, should we see any evidence that there is deterioration in the loan portfolio, we would adjust the allowance accordingly.
Old Line Bancshares, Inc. is the parent company of Old Line Bank, a Maryland chartered commercial bank headquartered in Bowie, Maryland, approximately 10 miles east of Andrews Air Force Base and 20 miles east of Washington, D.C. Old Line Bank has 19 branches located in its primary market area of suburban Maryland (Washington, D.C. suburbs and Southern Maryland) counties of Anne Arundel, Calvert, Charles, Prince George's and St. Mary's. It also targets customers throughout the greater Washington, D.C. metropolitan area.