June 30, 2021, an increase of $938,000, or 13.2% from $7,119,000 reported in non-performing assets as of December 31, 2020. The increase in non-performing assets during the six months ended June 30, 2021 was mainly due to one loan that was moved to non-accrual status during the three months ended June 30, 2021. Total allowance for loan losses to total non-performing assets was 100.83% as of June 30, 2021 and 111.43% at December 31, 2020. See the Non-Performing Assets section on page 47 for more information.
In addition to loans, another primary earning asset is our overall securities portfolio, which increased in size from December 31, 2020 to June 30, 2021. Debt securities available-for-sale amounted to $403,415,000 as of June 30, 2021, an increase of $36,704,000 from year-end 2020.
Interest-bearing deposits in other banks increased as of June 30, 2021, to $87,837,000 from $15,347,000 at year-end 2020 due to increased cash held at the Federal Reserve Bank. Time deposits with other banks were $247,000 at June 30, 2021 and December 31, 2020.
LOANS
Total loans increased to $741,905,000 as of June 30, 2021 as compared to $720,610,000 as of December 31, 2020. The table on page 19 provides data relating to the composition of the Company’s loan portfolio on the dates indicated. Total loans increased by $21,295,000 or 3.0%.
Steady demand for borrowing by businesses accounted for the 3.0% increase in the loan portfolio from December 31, 2020 to June 30, 2021. Overall, the Commercial and Industrial portfolio (which includes tax-free Commercial and Industrial loans) increased $12,019,000 or 13.1% to $103,894,000 at June 30, 2021 compared to $91,875,000 at December 31, 2020. The increase in the Commercial and Industrial portfolio resulted mainly from the portion of the Commercial and Industrial portfolio not attributable to the Paycheck Protection Program loans which increased $13,657,000 during the six months ended June 30, 2021. The increase was mainly due to $18,931,000 in new loan originations and an increase in utilization of existing Commercial and Industrial lines of credit of $1,212,000, offset with loan payoffs of $3,737,000, as well as regular principal payments and other typical fluctuations in the Commercial and Industrial portfolio. The portion of the Commercial and Industrial portfolio attributable to the PPP loans decreased by $1,638,000 during the six months ended June 30, 2021 as a result of $16,834,000 in new PPP loans originated during the six months ended June 30, 2021 which were offset by $18,472,000 in PPP loans paid off/forgiven during the same six-month period. The Commercial Real Estate portfolio (which includes tax-free Commercial Real Estate loans) increased $20,097,000 or 4.3% to $486,825,000 at June 30, 2021 compared to $466,728,000 at December 31, 2020. The increase was mainly the result of $59,978,000 in new loan originations and a $9,004,000 increase in utilization of existing Commercial Real Estate lines of credit, offset by $29,878,000 in loan payoffs, in addition to regular principal payments and other typical amortization in the Commercial Real Estate portfolio. Residential Real Estate loans decreased $11,018,000 or 7.0% to $145,965,000 at June 30, 2021 compared to $156,983,000 at December 31, 2020. The decrease was the result of $15,249,000 in new loan originations offset by a decrease in utilization of existing Residential Real Estate (Home Equity) lines of credit of $186,000, loan payoffs of $15,770,000, net loans sold of $10,037,000, and regular principal payments and other typical amortization in the Residential Real Estate portfolio. Net loans sold for the six months ended June 30, 2021 consisted of total loans sold during the six months ended June 30, 2021 of $20,765,000, offset with loans opened and sold in the same quarter during the first two quarters of 2021 which amounted to $10,728,000. The Company continues to originate and sell certain long-term fixed rate residential mortgage loans which conform to secondary market requirements. The Company derives ongoing income from the servicing of mortgages sold in the secondary market. The Company continues its efforts to lend to creditworthy borrowers.
Management believes that the loan portfolio is well diversified. The total commercial portfolio was $590,719,000 at June 30, 2021. Of total loans, $486,825,000 or 65.6% were secured by commercial real estate, primarily lessors of residential buildings and dwellings and lessors of non-residential buildings. The Company continues to monitor these portfolios.
Overall, the portfolio risk profile as measured by loan grade is considered low risk, as $716,568,000 or 96.6% of gross loans are graded Pass; $928,000 or 0.1% are graded Special Mention; $24,108,000 or 3.3% are graded Substandard; and $0 are graded Doubtful. The rating is intended to represent the best assessment of risk available at a