Comparison of the Results of Operations for the Three Months Ended March 31, 2018 and 2017
General. Net income increased $406,000, or 42.5%, to $1.4 million for the three months ended March 31, 2018 from $956,000 for the same period in 2017. This increase was the result of increases in net interest income and noninterest income $689,000 and $43,000, respectively, and a decrease of $7,000 in the provision for income taxes, partially offset by increases in the provision for loan losses and noninterest expense of $218,000 and $115,000, respectively.
Net interest income. Tax equivalent net interest income increased $608,000, or 11.50%, to $5.9 million for the three months ended March 31, 2018 from $5.3 million for the three months ended March 31, 2017. This increase was attributed to an increase in tax equivalent interest income of $740,000, partially offset by an increase in interest expense of $132,000.
Interest income. Tax equivalent interest income increased $740,000, or 11.7%, to $7.0 million for the three months ended March 31, 2018 from $6.3 million for the same period in 2017. This increase was attributed to increases in interest earned on loans and interest-earning deposits with banks and dividends on federal bank stocks of $721,000, $17,000 and $11,000, respectively, partially offset by a decrease in interest earned on securities of $9,000.
Tax equivalent interest earned on loans receivable increased $721,000, or 12.8%, to $6.4 million for the three months ended March 31, 2018 compared to $5.6 million for the same period in 2017. This increase resulted from a $50.0 million, or 9.4%, increase in average loans, accounting for an increase of $541,000 in interest income. The increase in loans receivable was related to the acquisition of Northern Hancock in September 2017 and strong loan growth achieved in late 2017 and the first three months of 2018. Adding to this favorable volume variance, the average yield on loans increased 14 basis points to 4.42% for the three months ended March 31, 2018, versus 4.28% for the same period in 2017. This favorable yield variance accounted for a $180,000 increase in interest income.
Tax equivalent interest earned on securities decreased $9,000, or 1.5%, to $583,000 for the three months ended March 31, 2018 compared to $592,000 for the three months ended March 31, 2017. This decrease resulted from a 2 basis point decrease in the average yield on securities to 2.38% for the three months ended March 31, 2018 versus 2.40% for the same period in 2017. This unfavorable yield variance accounted for a $7,000 decrease in interest income. Furthermore, the average balance of securities decreased $379,000, accounting for an additional $2,000 decrease in interest income.
Interest earned on deposits with banks increased $17,000 to $33,000 for the three months ended March 31, 2018 compared to $16,000 for the three months ended March 31, 2017. This increase resulted from a 39 basis point increase in the average yield on these accounts to 1.10% for the three months ended March 31, 2018, versus 0.71% for the same period in 2017, accounting for an $11,000 increase in interest income. Additionally, the average balance of interest-earning deposits increased $3.1 million, or 34.0%, accounting for an increase of $6,000 in interest income.
Dividends on federal bank stocks increased $11,000, or 20.8%, to $64,000 for the three months ended March 31, 2018 from $53,000 for the same period in 2017. This increase was primarily due to an increase of 135 basis points in the average yield on federal bank stocks to 5.70% for the three months ended March 31, 2018, versus 4.35% for the same period in 2017, accounting for a $15,000 increase in interest income. Partially offsetting the favorable yield variance, the average balance of federal bank stocks decreased $382,000, or 7.7%, accounting for a $4,000 decrease in interest income.
Interest expense. Interest expense increased $132,000, or 13.0%, to $1.1 million for the three months ended March 31, 2018 from $1.0 million for the same period in 2017. This increase in interest expense can be attributed to a $288,000 increase in interest incurred on deposits, partially offset by a decrease of $156,000 in interest incurred on borrowed funds.
Interest expense incurred on deposits increased $288,000, or 41.0%, to $991,000 for the three months ended March 31, 2018 compared to $703,000 for the same period in 2017. The average cost of interest-bearing deposits increased 14 basis points to 0.75% for the three months ended March 31, 2018, versus 0.61% for the same period in 2017, accounting for a $178,000 increase in interest expense. Additionally, the average balance of interest-bearing deposits increased $67.0 million, or 14.4%, to