Total deposits were $4.47 billion at September 30, 2024, which reflects a $105.3 million decrease from total deposits of $4.57 billion at December 31, 2023, and a decrease of $148.9 million from total deposits of $4.61 billion at September 30, 2023. The decrease in deposits at September 30, 2024, compared to December 31, 2023, was primarily due to decreases in non-interest bearing deposits of $165.9 million, savings accounts of $85.4 million, and NOW accounts of $16.5 million, partially offset by an increase of $19.6 million in money market accounts, and $142.8 million in time deposits. The decrease in deposits at September 30, 2024, compared to September 30, 2023, was primarily due to decreases in non-interest bearing deposits of $193.7 million, savings accounts of $117.6 million, NOW accounts of $19.1 million, and money market accounts of $11.3 million, partially offset by an increase in time deposits of $192.7 million. Total quarterly average deposits decreased $172.6 million, or 3.7%, in the year over year period, driven by declines in our average demand deposits of $175.8 million, and savings, NOW and money markets combined decreased $182.3 million, which was partially offset by average time deposit growth of $185.4 million. In general, the bulk of the decline in deposits year over year can be characterized as rate sensitive with significant flows and transfers into investing activities.
The following table presents estimated insured and uninsured deposits at September 30, 2024, and December 31, 2023, by deposit type, as well as the weighted average rates for each year to date ending period.
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(Dollars in thousands) | September 30, 2024 | | | December 31, 2023 |
| Total Deposits | | Insured Deposits | | Uninsured Deposits | | Average Rate Paid | | Total Deposits | | Insured Deposits | | Uninsured Deposits | | Average Rate Paid |
Noninterest bearing demand | $ | 1,669,000 | | $ | 1,086,500 | | $ | 582,500 | | - | % | | $ | 1,834,891 | | $ | 1,137,089 | | $ | 697,802 | | - | % |
Savings | | 885,933 | | | 827,107 | | | 58,826 | | 0.33 | | | | 971,334 | | | 905,163 | | | 66,171 | | 0.11 | |
NOW accounts | | 548,923 | | | 381,832 | | | 167,091 | | 0.52 | | | | 565,375 | | | 414,005 | | | 151,370 | | 0.27 | |
Money market accounts | | 690,840 | | | 458,380 | | | 232,460 | | 1.69 | | | | 671,240 | | | 473,006 | | | 198,234 | | 0.80 | |
Time deposits | | 670,728 | | | 570,291 | | | 100,437 | | 3.20 | | | | 527,906 | | | 452,000 | | | 75,906 | | 1.45 | |
Total | $ | 4,465,424 | | $ | 3,324,110 | | $ | 1,141,314 | | 0.82 | % | | $ | 4,570,746 | | $ | 3,381,263 | | $ | 1,189,483 | | 0.32 | % |
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Collateralized public funds | $ | 249,110 | | $ | 16,313 | | $ | 232,797 | | | | | $ | 247,202 | | $ | 15,211 | | $ | 231,991 | | | |
Deposits experienced a moderate decline of 2.3% for the nine months ended September 30, 2024; our deposit level has remained stable into the second half of 2024. Deposit balances continued to shift into interest bearing accounts in the third quarter of 2024 as customers seek higher interest rates. In response to the Federal Reserve Bank rate cut, we reduced the interest rate on our CD specials in late September 2024, thus we expect the migration of balances into interest bearing accounts to start to slow.
In addition to deposits, we used other liquidity sources for our funding needs in all periods presented, such as repurchase agreements and other short-term borrowings with the FHLBC. Securities sold under repurchase agreements totaled $53.9 million at September 30, 2024, a $27.4 million, or 103.5%, increase from $26.5 million at December 31, 2023, and an increase of $28.0 million, or 108.0%, from September 30, 2023. The outstanding balance of our short-term FHLBC borrowings was $335.0 million as of September 30, 2024, $405.0 million as of December 31, 2023, and $435.0 million as of September 30, 2023.
We are also indebted on $25.8 million of junior subordinated debentures, net of deferred issuance costs, as of September 30, 2024, which are related to the trust preferred securities issued by its statutory trust subsidiary, Old Second Capital Trust II (“Trust II”). The Trust II issuance converted from fixed to floating rate at three month LIBOR, which is now three month Term SOFR, plus 150 basis points beginning June 15, 2017. Upon conversion to a floating rate, we initiated a cash flow hedge which resulted in net year to date interest rate paid on this debt of 4.34% as of September 30, 2024, as compared to 6.77%, which was the rate paid during the period prior to the June 15, 2017, rate reset.
In the second quarter of 2021, we entered into Subordinated Note Purchase Agreements with certain qualified institutional buyers pursuant to which we issued $60.0 million in aggregate principal amount of our 3.50% Fixed-to-Floating Rate Subordinated Notes due April 15, 2031 (the “Notes”). We sold the Notes to eligible purchasers in a private offering, and the proceeds of this issuance were used for general corporate purposes. The Notes bear interest at a fixed annual rate of 3.50% through April 14, 2026, payable semi-annually in arrears. As of April 15, 2026, forward, the interest rate on the Notes will generally reset quarterly to a rate equal to three-month Term SOFR (as defined by the Note) plus 273 basis points, payable quarterly in arrears. The Notes have a stated maturity of April 15, 2031, and are redeemable, in whole are in part, on April 15, 2026, or any interest payment date thereafter, and at any time upon the occurrence of certain events. As of September 30, 2024, we had $59.4 million of subordinated debentures outstanding, net of deferred issuance costs.
In December 2016, we completed a $45.0 million senior note issuance. The notes had a ten-year term, and included interest payable semiannually at 5.75% for five years. Beginning December 31, 2021, the interest became payable quarterly at three month LIBOR plus 385 basis points. On June 30, 2023, the senior notes were redeemed in full. The remaining balance of deferred debt issuance costs of $362,000 related to these senior notes was recognized as interest expense as of June 30, 2023.