Deposits and Borrowings
Deposits were $10.8 billion as of September 30, 2023, compared to $10.8 billion and $9.5 billion as of June 30, 2023, and September 30, 2022, respectively. Noninterest-bearing demand deposits accounted for 22% of total deposits as of September 30, 2023, compared to 25% and 37% as of June 30, 2023 and September 30, 2022, respectively. Certificates of deposit accounted for 28% of total deposits as of September 30, 2023, compared to 26% and 9% as of June 30, 2023 and September 30, 2022, respectively. Core deposits accounted for 75.4% of total deposits as of September 30, 2023, compared to 79.6% and 97.1% as of June 30, 2023 and September 30, 2022, respectively. Brokered deposits accounted for 24.6% of total deposits as of September 30, 2023, compared to 20.4% and 2.99% as of June 30, 2023 and September 30, 2022, respectively.
Cost of deposits increased to 3.03% for the third quarter of 2023 compared to 2.85% for the prior quarter and 0.64% for the third quarter of 2022.
Insured and collateralized deposits accounted for approximately 87.4% of total deposits as of September 30, 2023, compared to approximately 88% of total deposits as of June 30, 2023.
Our loan to deposit ratio measured 95.1% as of September 30, 2023, compared to 97.9% and 108.4% as of June 30, 2023 and September 30, 2022, respectively.
Borrowings were $984 million as of September 30, 2023, compared to $802 million and $1.3 billion as of June 30, 2023, and September 30, 2022, respectively. Average borrowings outstanding for the quarter ended September 30, 2023, were $587 million compared to $1.7 billion for the prior quarter. The decrease in average borrowings from the prior quarter was due to the continued paydown of additional borrowings which were used to increase on-balance sheet liquidity following the banking industry events occurring in the later part of the first quarter and into the second quarter of 2023. As deposit levels stabilized and began to return to previous levels, some of these additional borrowings were paid down.
Private Wealth Management and Trust Assets
AUM was $5.0 billion as of September 30, 2023, compared to $5.3 billion and $4.6 billion as of June 30, 2023 and September 30, 2022, respectively. The net change in AUM balance of $0.3 billion from the prior quarter is comprised of the following: $77 million of new accounts; $248 million of net withdrawals; and $125 million of performance losses. AUA at FFB’s Trust Department was $1.2 billion as of September 30, 2023, unchanged compared to both June 30, 2023 and September 30, 2022.
Net Interest Income and Net Interest Margin
Net interest income was $52.1 million for the third quarter of 2023, compared to $49.0 million for the prior quarter and $87.7 million for the third quarter of 2022. Interest income totaled $144.8 million for the third quarter of 2023 compared to $145.3 million for the prior quarter and $108.7 million for the third quarter of 2022. The slight decrease in interest income compared to the prior quarter was due to a decrease in the average interest-earning asset balances only partially offset by a slight increase in the average yields earned on such balances. Average interest-earning asset balances totaled $12.6 billion for the third quarter of 2023, compared to $12.9 billion for the prior quarter and $11.3 billion for the third quarter of 2022. Yields on interest-earning assets averaged 4.56% for the third quarter of 2023, compared to 4.51% for the prior quarter and 3.84% for the third quarter of 2022.
Interest expense was $92.7 million for the third quarter of 2023, compared to $96.3 million for the prior quarter and $21.1 million for the third quarter of 2022. The decrease in interest expense compared to the prior quarter was due to a decrease in average interest-bearing liability balances only partially offset by an increase in the