We have contracted with an outside computer service company to provide our core data processing services. Data processing costs increased $136,000, or 12.5%, for the year ended December 31, 2010 and $55,000, or 5.3%, for the year ended December 31, 2009 compared to the same periods in 2009 and 2008, respectively. A significant portion of the fee charged by the third party processor is directly related to the number of loan and deposit accounts and the related number of transactions. Our electronic banking and credit bureau fees, specifically, have increased as we have grown our client base during the year ended December 31, 2010.
We receive income from debit card transactions performed by our clients. Since we outsource this service, we are charged related transaction expenses by our merchant service provider. Debit card transaction expense was $128,000 and $98,000 for the years ended December 31, 2010 and 2009, respectively, and $92,000 for the year ended December 31, 2008.
Occupancy expense represented 13.4%, 12.9% and 12.6% of total noninterest expenses for the years ended December 31, 2010, 2009, and 2008, respectively. Occupancy expense increased $197,000 to $2.1 million for the year ended December 31, 2010 from $1.9 million for the same period in 2009. The increase is due primarily to the expenses related to our new regional headquarters in Columbia, South Carolina which opened in August 2009. During 2009, occupancy expense increased $384,000 from $1.6 million for the year ended December 31, 2008, due primarily to the additional expenses associated with our two new retail offices opened in July 2008.
The remaining $64,000 increase in general and administrative expenses for the year ended December 31, 2010, compared to the same period in 2009, resulted primarily from increases of $100,000 in insurance expenses, $9,000 in professional fees, $31,000 in marketing expenses, $37,000 in telephone expenses, partially offset by a decrease of $113,000 in other expenses. The increase in insurance expense is primarily related to a general increase in the assessment rate used to calculate FDIC insurance premiums as well as an increased assessment from the OCC. The increases in marketing and telephone expenses are essentially due to increased community support and additional marketing efforts in our two primary markets and to additional communication costs associated with our new regional headquarters in Columbia, South Carolina. In addition, the $113,000 decrease in other expense is primarily due to a $52,000 decrease in general office supplies as well as a $58,000 decrease in decrease in collection expenses.
Contributing to the increase in noninterest expenses for the year ended December 31, 2009 compared to the same period in 2008 were increases of $873,000 in insurance expenses, $125,000 in professional fees, $76,000 in marketing expenses, $90,000 in telephone expenses and $60,000 in other expenses. The significant increase in insurance expense during 2009 is primarily related to a general increase in the assessment rate used to calculate FDIC insurance premiums as well as the special assessment of approximately $300,000 charged by the FDIC. The increase in professional fees relates primarily to increased legal, accounting, and directors fees, while the increases in marketing and telephone expenses are due to increased community support and basic communication costs. In addition, the $60,000 increase in other expense is primarily due to a $115,000 increase in collection expenses, partially offset by decreases of $41,000 in office supplies, $32,000 in deposit account losses, and $23,000 in travel and business meal expenses.
Income tax expense was $193,000, $345,000 and $626,000 for the years ended December 31, 2010, 2009 and 2008, respectively. Our effective tax rate was 17.8% for the year ended December 31, 2010, and 19.6% and 25.3% for the years ended December 31, 2009 and 2008, respectively. The lower net income during these years, combined with additional tax-exempt income from bank owned life insurance and state and municipal investment securities, increased the impact that our tax-exempt income had in lowering our effective tax rate.
Balance Sheet Review
General
At December 31, 2010, we had total assets of $736.5 million, consisting principally of $572.4 million in loans, $72.9 million in investments, $49.7 million in federal funds sold, and $14.5 million in bank owned life insurance. Our liabilities at December 31, 2010 totaled $677.3 million, consisting principally of $536.3 million in deposits, $122.7 million in FHLB advances and related debt, and $13.4 million of junior subordinated debentures. At December 31, 2010, our shareholders' equity was $59.2 million.
At December 31, 2009, we had total assets of $719.3 million, consisting principally of $574.3 million in loans, $94.6 million in investments, $6.5 million in federal funds sold, $5.6 million in cash and due from banks, and $14.0 million in bank owned life insurance. Our liabilities at December 31, 2009 totaled $659.5 million, consisting principally of $494.1 million in deposits, $142.7 million in FHLB advances and related debt, a $4.3 million note payable, and $13.4 million of junior subordinated debentures. At December 31, 2009, our shareholders' equity was $59.8 million.