Comparison of Operating Results for the Three Months Ended September 30, 2021 and 2020
General. Net income for the quarter ended September 30, 2021 was $173,000 as compared to $640,000 for the quarter ended September 30, 2020, a decrease of $467,000 or 73.0%. The decrease was due to a $474,000 decrease in noninterest income, a $468,000 increase in noninterest expense, and a $10,000 increase in income tax expense, partially offset by a $470,000 increase in net interest income and a $15,000 decrease in provision for loan losses.
Interest and Dividend Income. Interest and dividend income increased $139,000, or 4.1%, to $3.5 million for the quarter ended September 30, 2021 from $3.4 million for the quarter ended September 30, 2020. This increase was primarily attributable to a $98,000 increase in interest on loans receivable and a net increase of $45,000 in interest on investment securities. The average balance of loans increased $1.3 million, or 0.4%, to $289.2 million for the quarter ended September 30, 2021 from $288.0 million for the quarter ended September 30, 2020. The average yield on loans increased 12 basis points to 4.49% for the 2021 period from 4.37% for the 2020 period, reflecting an increase in higher yielding consumer loans period to period. The average balance of investment securities increased $8.7 million, or 29.5%, to $38.0 million for the quarter ended September 30, 2021 from $29.4 million for the quarter ended September 30, 2020, while the average yield on investment securities decreased 18 basis points to 2.68% for the 2021 period from 2.86% for the 2020 period.
Interest Expense. Total interest expense decreased $331,000, or 45.5%, to $396,000 for the quarter ended September 30, 2021 from $727,000 for the quarter ended September 30, 2020. Interest expense on total interest-bearing deposits decreased $261,000, or 46.5%, to $300,000 for the quarter ended September 30, 2021 from $561,000 for the quarter ended September 30, 2020. The decrease was primarily attributable to a decrease of $15.1 million, or 16.1%, in the average balance of certificates of deposit to $79.1 million for the quarter ended September 30, 2021 from $94.3 million for the quarter September 30, 2020, in addition to a decrease in the average cost of 99 basis points to 0.72% for the quarter ended September 30, 2021 from 1.71% for the same period in 2020. Interest expense on borrowings decreased $70,000, or 42.2%, to $96,000 for the quarter ended September 30, 2021 from $166,000 for the quarter ended September 30, 2020, due to a 28 basis points decrease in average borrowing costs to 1.86% for the quarter ended September 30, 2021 from 2.14% for the quarter ended September 30, 2020, as a result of a decrease in the average balance of borrowings of $10.4 million to $20.6 million for the quarter ended September 30, 2021 from $31.0 million for the quarter ended September 30, 2020.
Net Interest Income. Net interest income increased $470,000, or 17.6%, to $3.1 million for the quarter ended September 30, 2021 from $2.7 million for the quarter ended September 30, 2020. Our net interest rate spread increased to 3.71% for the quarter ended September 30, 2021 from 3.26% for the quarter ended September 30, 2020. Our net interest margin increased to 3.72% for the quarter ended September 30, 2021 from 3.25% for the same period in 2020. Net interest rate spread and net interest margin were affected primarily by changes in our asset mix and the decrease in cost of funds between the comparable periods.
Provision for Loan Losses. Based on management’s analysis of the allowance for loan losses described in Note 6 of our interim consolidated financial statements “Allowance for Loan Losses,” we recorded a provision for loan losses of $135,000 for the quarter ended September 30, 2021 as compared to a provision for loan losses of $150,000 for the quarter ended September 30, 2020. The allowance for loan losses was $2.1 million, or 0.76%, of total loans at September 30, 2021 as compared to $1.8 million, or 0.65%, of total loans at December 31, 2020. The decrease in provision for loan losses for the 2021 period was primarily due to the attainment of adequate cash reserve balances associated with our purchased loan portfolio.
Noninterest Income. Noninterest income decreased $474,000, or 41.4%, to $671,000 for the quarter ended September 30, 2021 from $1.1 million for the quarter ended September 30, 2020. The decrease was primarily due a decrease in net gain on sale of securities, partially offset by an increase in banking fees and service charges. Net gain on sale of securities decreased $496,000, or 97.5%, to $13,000 for the quarter ended September 30, 2021 as compared to $509,000 for the quarter ended September 30, 2020 due to increased sales of securities in 2020. Banking fees and service charges increased $30,000, or 8.1%, to $400,000 for the quarter ended September 30, 2021 from $370,000 for the quarter ended September 30, 2020, due to increases in insufficient funds charges and loan late fees assessed in 2021.