Total liabilities decreased $11.8 million to $418.9 million at March 31, 2013 from $430.7 million at September 30, 2012. The decrease was due to a $9.5 million decrease in deposits and a $1.6 million decrease in accrued interest related to certificates of deposit as interest accrued on such deposits is generally distributed at the end of the calendar year. Allowing the runoff of higher costing certificates of deposit as part of the Company's asset-liability management strategy led to the reduction in total assets described above.
Stockholders' equity increased by $349,000 to $60.2 million at March 31, 2013. The increase primarily reflected equity increases associated with stock benefit plan expenses of $433,000. Also contributing to the increase was net income of $286,000 for the first six months of fiscal 2013, offset partially by a decline in the unrealized gain on available for sale securities.
Net interest income decreased $206,000 or 6.2% to $3.1 million for the three months ended March 31, 2013 as compared to $3.3 million for the same period in 2012. The decrease was due to a $560,000 or 11.6% decrease in interest income partially offset by a $354,000 or 23.7% decrease in interest expense. The decrease in interest income resulted from a 35 basis point decrease to 3.66% in the weighted average yield earned on interest-earning assets combined with a $14.8 million or 3.1% decrease in the average balance of interest-earning assets for the three months ended March 31, 2013, as compared to the same period in 2012. The decrease in the weighted average yield earned was primarily due to the reinvestment of the proceeds from called investment securities and the origination of new loans at lower current market rates. The decrease in the average balance reflected the use of assets to fund the outflow of higher costing deposits, primarily certificates of deposit. The decrease in interest expense resulted primarily from a 28 basis point decrease to 1.09% in the weighted average rate paid on interest-bearing liabilities, reflecting the continued repricing downward of interest-bearing liabilities during the year combined with a $19.2 million or 4.4% decrease in the average balance of interest-bearing liabilities, primarily certificates of deposit, for the three months ended March 31, 2013, as compared to the same period in 2012. The decline in the weighted average rate paid reflected the continued effect of the low interest rate environment on the Bank's cost of funds as deposits repriced downward as well as the Bank's continued implementation of its asset/liability strategies designed to reduce its use of higher costing certificates of deposit as a funding source.