Net charged-off loans increased during fourth quarter 2011, as compared to third quarter 2011 and fourth quarter 2010. Approximately 34% of the net charged-off loans during fourth quarter 2011 were located in the Flathead, Gallatin Valley and Jackson market areas. Additionally, approximately 58% of the loans charged-off during fourth quarter 2011 were related to five borrowers, including three construction, one commercial and one residential real estate borrowers.
As of December 31, 2011, total non-performing loans included $216 million of real estate loans, of which $102 million were construction loans and $87 million were commercial real estate loans. Non-performing construction loans as of December 31, 2011 were comprised of land acquisition and development loans of $63 million, commercial construction loans of $25 million and residential construction loans of $14 million.
Non-accrual loans decreased $24 million during fourth quarter 2011, as compared to third quarter 2011, primarily due to an $8 million construction loan returned to accrual status during fourth quarter 2011 and the partial charge-off and reclassification of three loans aggregating $8 million to OREO. Decreases in non-accrual loans due to charge-off, pay-off or foreclosure were partially offset by the loans of one commercial real estate, one consumer real estate and one commercial construction borrower aggregating $21 million that were placed on non-accrual status during fourth quarter 2011. As of December 31, 2011, approximately 39% of the Company's non-accrual loans were in the Flathead, Gallatin Valley and Jackson market areas, including the significant fourth quarter additions described above.
OREO increased during fourth quarter 2011, as compared to third quarter 2011 and fourth quarter 2010. During fourth quarter 2011, the Company recorded additions to OREO of $17 million, which included the three large non-accrual loans mentioned above and one $7 million residential real estate loan. Additionally, the Company wrote down the fair value of OREO properties by $1 million and sold OREO with a net book value of $4 million at a slight gain. As of December 31, 2011, approximately 67% of total OREO was comprised of properties located in the Flathead, Gallatin Valley and Jackson market areas.