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Investment Securities | 6 Months Ended
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Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities Below is an analysis of the amortized cost and estimated fair values of securities available for sale at:
| June 30, 2013 |  | December 31, 2012
| 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 | $ | 25,119 |  |  | $ | 2,944 |  |  | $ | (27 | ) |  | $ | 28,036 |  |  | $ | 27,883 |  |  | $ | 3,781 |  |  | $ | — |  |  | $ | 31,664 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 981,279 |  |  | 14,549 |  |  | (17,643 | ) |  | 978,185 |  |  | 839,102 |  |  | 25,691 |  |  | (392 | ) |  | 864,401 |
Mortgage-Backed Securities – Commercial | 125 |  |  | 1 |  |  | — |  |  | 126 |  |  | 148 |  |  | 1 |  |  | — |  |  | 149 |
Other Government-Sponsored Enterprises | 267,966 |  |  | 311 |  |  | (2,981 | ) |  | 265,296 |  |  | 241,970 |  |  | 766 |  |  | (72 | ) |  | 242,664 |
Obligations of States and Political Subdivisions | 81 |  |  | 2 |  |  | — |  |  | 83 |  |  | 82 |  |  | 4 |  |  | — |  |  | 86 |
Corporate Securities | 6,698 |  |  | 312 |  |  | (26 | ) |  | 6,984 |  |  | 6,703 |  |  | 288 |  |  | — |  |  | 6,991 |
Pooled Trust Preferred Collateralized Debt Obligations | 49,531 |  |  | 422 |  |  | (24,084 | ) |  | 25,869 |  |  | 51,866 |  |  | 3 |  |  | (28,496 | ) |  | 23,373 |
Total Debt Securities | 1,330,799 |  |  | 18,541 |  |  | (44,761 | ) |  | 1,304,579 |  |  | 1,167,754 |  |  | 30,534 |  |  | (28,960 | ) |  | 1,169,328 |
Equities | 1,820 |  |  | 288 |  |  | — |  |  | 2,108 |  |  | 1,859 |  |  | 116 |  |  | — |  |  | 1,975 |
Total Securities Available for Sale | $ | 1,332,619 |  |  | $ | 18,829 |  |  | $ | (44,761 | ) |  | $ | 1,306,687 |  |  | $ | 1,169,613 |  |  | $ | 30,650 |  |  | $ | (28,960 | ) |  | $ | 1,171,303 |
The amortized cost and estimated fair value of debt securities available for sale at June 30, 2013, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or repay obligations with or without call or prepayment penalties.
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 28,081 |  |  | $ | 28,265 |
Due after 1 but within 5 years | 239,966 |  |  | 237,114 |
Due after 5 but within 10 years | — |  |  | — |
Due after 10 years | 56,229 |  |  | 32,853 |
| 324,276 |  |  | 298,232 |
Mortgage-Backed Securities (a) | 1,006,523 |  |  | 1,006,347 |
Total Debt Securities | $ | 1,330,799 |  |  | $ | 1,304,579 |
(a) | Mortgage Backed Securities include an amortized cost of $25.1 million and a fair value of $28.0 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $981.4 million and a fair value of $978.3 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.
Proceeds from sales, gross gains (losses) realized on sales, maturities and other-than-temporary impairment charges related to securities available for sale were as follows for the six-months ended June 30:
| 2013 |  | 2012
| (dollars in thousands)
Proceeds from sales | $ | 42 |  |  | $ | — |
Gross gains (losses) realized: |  |  |
Sales Transactions: |  |  |
Gross gains | $ | 4 |  |  | $ | — |
Gross losses | — |  |  | — |
| 4 |  |  | — |
Maturities and impairment |  |  |
Gross gains | 4 |  |  | — |
Gross losses | — |  |  | — |
Other-than-temporary impairment | — |  |  | — |
| 4 |  |  | — |
Net gains and impairment | $ | 8 |  |  | $ | — |
Securities available for sale with an estimated fair value of $645.6 million and $631.0 million were pledged as of June 30, 2013 and December 31, 2012, respectively, to secure public deposits and for other purposes required or permitted by law.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 + Details
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