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Securities Available for Sale (Tables) | 12 Months Ended
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Dec. 31, 2012
Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale | Below is an analysis of the amortized cost and fair values of securities available for sale at December 31:
|  | 2012 |  |  | 2011 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (dollars in thousands) |
Obligations of U.S. Government Agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities—Residential |  | $ | 27,883 |  |  | $ | 3,781 |  |  | $ | 0 |  |  | $ | 31,664 |  |  | $ | 32,139 |  |  | $ | 4,061 |  |  | $ | (6 | ) |  | $ | 36,194 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities—Residential |  |  | 839,102 |  |  |  | 25,691 |  |  |  | (392 | ) |  |  | 864,401 |  |  |  | 771,196 |  |  |  | 29,835 |  |  |  | 0 |  |  |  | 801,031 |
Mortgage-Backed Securities—Commercial |  |  | 148 |  |  |  | 1 |  |  |  | 0 |  |  |  | 149 |  |  |  | 193 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 193 |
Other Government—Sponsored Enterprises |  |  | 241,970 |  |  |  | 766 |  |  |  | (72 | ) |  |  | 242,664 |  |  |  | 267,807 |  |  |  | 973 |  |  |  | (132 | ) |  |  | 268,648 |
Obligations of States and Political Subdivisions |  |  | 82 |  |  |  | 4 |  |  |  | 0 |  |  |  | 86 |  |  |  | 444 |  |  |  | 15 |  |  |  | 0 |  |  |  | 459 |
Corporate Securities |  |  | 6,703 |  |  |  | 288 |  |  |  | 0 |  |  |  | 6,991 |  |  |  | 11,811 |  |  |  | 162 |  |  |  | (562 | ) |  |  | 11,411 |
Pooled Trust Preferred Collateralized Debt Obligations |  |  | 51,866 |  |  |  | 3 |  |  |  | (28,496 | ) |  |  | 23,373 |  |  |  | 54,762 |  |  |  | 3 |  |  |  | (31,785 | ) |  |  | 22,980 |
Total Debt Securities |  |  | 1,167,754 |  |  |  | 30,534 |  |  |  | (28,960 | ) |  |  | 1,169,328 |  |  |  | 1,138,352 |  |  |  | 35,050 |  |  |  | (32,486 | ) |  |  | 1,140,916 |
Equities |  |  | 1,859 |  |  |  | 116 |  |  |  | 0 |  |  |  | 1,975 |  |  |  | 1,860 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,860 |
Total Securities Available for Sale |  | $ | 1,169,613 |  |  | $ | 30,650 |  |  | $ | (28,960 | ) |  | $ | 1,171,303 |  |  | $ | 1,140,212 |  |  | $ | 35,050 |  |  | $ | (32,486 | ) |  | $ | 1,142,776 |
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale | The amortized cost and fair value of debt securities at December 31, 2012, by contractual maturity, are shown below:
|  | Amortized Cost |  |  | Estimated Fair Value |
|  | (dollars in thousands) |
Due within 1 year |  | $ | 0 |  |  | $ | 0 |
Due after 1 but within 5 years |  |  | 242,052 |  |  |  | 242,750 |
Due after 5 but within 10 years |  |  | 0 |  |  |  | 0 |
Due after 10 years |  |  | 58,569 |  |  |  | 30,364 |
|  |  | 300,621 |  |  |  | 273,114 |
Mortgage-Backed Securities (a) |  |  | 867,133 |  |  |  | 896,214 |
Total debt securities |  | $ | 1,167,754 |  |  | $ | 1,169,328 |
(a) | Mortgage Backed Securities include an amortized cost of $28 million and a fair value of $32 million for Obligations of U.S. Government agencies issued by Ginnie Mae and Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac which had an amortized cost of $839 million and a fair value of $864 million.
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale | Proceeds from sale, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the years ended December 31:
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | (dollars in thousands) |
Proceeds from sale |  | $ | 0 |  |  | $ | 76,914 |  |  | $ | 143,503 |
Gross gains (losses) realized: |  |  |  |  |  |  |  |  |  |  |  |
Sales Transactions: |  |  |  |  |  |  |  |  |  |  |  |
Gross gains |  | $ | 0 |  |  | $ | 2,368 |  |  | $ | 2,892 |
Gross losses |  |  | 0 |  |  |  | (258 | ) |  |  | (790 | )
|  |  | 0 |  |  |  | 2,110 |  |  |  | 2,102 |
Maturities, calls and impairment: |  |  |  |  |  |  |  |  |  |  |  |
Gross gains |  |  | 192 |  |  |  | 75 |  |  |  | 270 |
Gross losses |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Other-than-temporary impairment |  |  | 0 |  |  |  | 0 |  |  |  | (9,193 | )
|  |  | 192 |  |  |  | 75 |  |  |  | (8,923 | )
Net gains (losses) and impairment |  | $ | 192 |  |  | $ | 2,185 |  |  | $ | (6,821 | )

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