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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
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:
| 2014 |  | 2013
| 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 | $ | 23,344 |  |  | $ | 2,595 |  |  | $ | (3 | ) |  | $ | 25,936 |  |  | $ | 22,639 |  |  | $ | 2,624 |  |  | $ | (59 | ) |  | $ | 25,204 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 947,635 |  |  | 13,076 |  |  | (9,830 | ) |  | 950,881 |  |  | 1,009,519 |  |  | 12,531 |  |  | (27,163 | ) |  | 994,887 |
Mortgage-Backed Securities – Commercial | 72 |  |  | 2 |  |  | — |  |  | 74 |  |  | 104 |  |  | 1 |  |  | — |  |  | 105 |
Other Government-Sponsored Enterprises | 269,181 |  |  | 4 |  |  | (1,308 | ) |  | 267,877 |  |  | 267,971 |  |  | 81 |  |  | (1,927 | ) |  | 266,125 |
Obligations of States and Political Subdivisions | 27,058 |  |  | 362 |  |  | (43 | ) |  | 27,377 |  |  | 80 |  |  | — |  |  | — |  |  | 80 |
Corporate Securities | 6,682 |  |  | 573 |  |  | — |  |  | 7,255 |  |  | 6,693 |  |  | 328 |  |  | — |  |  | 7,021 |
Pooled Trust Preferred Collateralized Debt Obligations | 41,926 |  |  | 309 |  |  | (13,236 | ) |  | 28,999 |  |  | 42,040 |  |  | — |  |  | (18,517 | ) |  | 23,523 |
Total Debt Securities | 1,315,898 |  |  | 16,921 |  |  | (24,420 | ) |  | 1,308,399 |  |  | 1,349,046 |  |  | 15,565 |  |  | (47,666 | ) |  | 1,316,945 |
Equities | 1,420 |  |  | — |  |  | — |  |  | 1,420 |  |  | 1,420 |  |  | — |  |  | — |  |  | 1,420 |
Total Securities Available for Sale | $ | 1,317,318 |  |  | $ | 16,921 |  |  | $ | (24,420 | ) |  | $ | 1,309,819 |  |  | $ | 1,350,466 |  |  | $ | 15,565 |  |  | $ | (47,666 | ) |  | $ | 1,318,365 |
The amortized cost and fair value of debt securities at December 31, 2014, by contractual maturity, are shown below:
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 3,000 |  |  | $ | 2,998 |
Due after 1 but within 5 years | 266,181 |  |  | 264,879 |
Due after 5 but within 10 years | 21,849 |  |  | 22,104 |
Due after 10 years | 53,817 |  |  | 41,527 |
| 344,847 |  |  | 331,508 |
Mortgage-Backed Securities (a) | 971,051 |  |  | 976,891 |
Total Debt Securities | $ | 1,315,898 |  |  | $ | 1,308,399 |
(a) | Mortgage Backed Securities include an amortized cost of $23.3 million and a fair value of $25.9 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 $947.7 million and a fair value of $951.0 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 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 years ended December 31:
| 2014 |  | 2013 |  | 2012
| (dollars in thousands)
Proceeds from sales | $ | 132,868 |  |  | $ | 671 |  |  | $ | — |
Gross (losses) gains realized: |  |  |  |  |
Sales Transactions: |  |  |  |  |
Gross gains | $ | 291 |  |  | $ | 233 |  |  | $ | — |
Gross losses | (243 | ) |  | — |  |  | — |
| 48 |  |  | 233 |  |  | — |
Maturities and impairment |  |  |  |  |
Gross gains | 502 |  |  | 4 |  |  | 192 |
Gross losses | — |  |  | (1,395 | ) |  | — |
Other-than-temporary impairment | — |  |  | — |  |  | — |
| 502 |  |  | (1,391 | ) |  | 192 |
Net gains and impairment | $ | 550 |  |  | $ | (1,158 | ) |  | $ | 192 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: 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=27724398&loc=d3e27290-111563 Reference 2: 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=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 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 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: 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=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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