above that resulted in 45one- to four-family properties with an aggregate value of $6.3 million being transferred to foreclosed assets held for sale. As of September 30, 2018, 15 of these properties were sold. The increase in interest receivable was mostly due to an increase in the average balance of loans, the slight increase in deferred income taxes was due to an increase in our deferred tax assets, and the increase in mortgage servicing rights was the result of both an increase in the balance of FHLB Mortgage Partnership Finance loans serviced and the market value of the servicing.
At September 30, 2018, our investment in bank-owned life insurance was $8.9 million, an increase of $67,000 from $8.8 million at June 30, 2018. We invest in bank-owned life insurance to provide us with a funding source for our benefit plan obligations. Bank-owned life insurance also generally provides us noninterest income that isnon-taxable. Federal regulations generally limit our investment in bank-owned life insurance to 25% of our Tier 1 capital plus our allowance for loan losses, which totaled $20.1 million at September 30, 2018.
Deposits increased $10.4 million, or 2.2%, to $490.8 million at September 30, 2018 from $480.4 million at June 30, 2018. Certificates of deposit, excluding brokered certificates of deposit, increased $9.8 million, or 4.3%, to $239.0 million, brokered certificates of deposit increased $7.0 million, or 20.2%, to $41.3 million, savings, NOW, and money market accounts decreased $7.2 million, or 3.7%, to $188.2 million, and noninterest bearing demand accounts increased $876,000, or 4.1%, to $22.2 million. Repurchase agreements decreased $147,000, or 6.4%, to $2.1 million at September 30, 2018 from $2.3 million at June 30, 2018. Borrowings, which consisted solely of advances from the Federal Home Loan Bank of Chicago, increased $7.3 million, or 10.7%, to $74.8 million at September 30, 2018 from $67.5 million at June 30, 2018.
Advances from borrowers for taxes and insurance increased $348,000, or 112.6%, to $657,000 at September 30, 2018 from $309,000 at June 30, 2018, while accrued interest payable increased $205,000, or 109.1%, to $393,000 at September 30, 2018 from $188,000 at June 30, 2018. Other liabilities decreased $921,000, or 24.4%, to $2.9 million at September 30, 2018 from $3.8 million on June 30, 2018. The increase in advances from borrowers for taxes and insurance was attributable to the timing of the payment of real estate taxes and insurance, while the increase in accrued interest payable was due to an increase in average balances and rates on deposits and advances. The decrease in other liabilities was the result of a large payable at June 30, 2018 related to the credit discussed in the “Overview” above, that was cleared when the 45 properties moved to foreclosed assets held for sale in July, 2018.
Total equity decreased $594,000, or 0.7%, to $81.1 million at September 30, 2018 from $81.7 million at June 30, 2018. Equity decreased due to a decrease of $1.2 million in accumulated other comprehensive income, net of tax, and by dividends payable of $484,000, partially offset by net income of $934,000. The Company announced a stock repurchase plan on February 5, 2016, whereby the Company could repurchase up to 207,703 shares of its common stock, or approximately 5% of the then current outstanding shares. There were no shares of the Company’s common stock repurchased by the Company during the three months ended September 30, 2018, and there were 58,050 shares yet to be repurchased under the plan as of September 30, 2018.
Comparison of Operating Results for the Three Months Ended September 30, 2018 and 2017
General. Net income decreased $41,000 to $934,000 for the three months ended September 30, 2018 from $975,000 net income for the three months ended September 30, 2017. The decrease was primarily due to an increase in noninterest expense, partially offset by an increase in net interest income, an increase in noninterest income, and a decrease in the provision for loan losses.
Net Interest Income.Net interest income increased by $51,000, or 1.2%, to $4.5 million for the three months ended September 30, 2018 from $4.4 million for the three months ended September 30, 2017. The increase was due to an increase of $951,000 in interest income, mostly offset by an increase of $900,000 in interest expense. A $43.1 million, or 7.4%, increase in the average balance of interest earning assets was offset by a $49.2 million, or 10.0%, increase in the average balance of interest bearing liabilities. Our net interest margin decreased by 17 basis points to 2.85% for the three months ended September 30, 2018 compared to 3.02% for the three months ended September 30, 2017, while our interest rate spread decreased by 23 basis points to 2.66% for the three months ended September 30, 2018 compared to 2.89% for the three months ended September 30, 2017.
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