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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Held-to-maturity Securities | Below is an analysis of the amortized cost and fair values of debt securities held to maturity at December 31, 2015. There were no held to maturity securities at December 31, 2014.
| December 31, 2015
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (dollars in thousands)
Obligations of U.S. Government Agencies: |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | $ | 4,775 |  |  | $ | — |  |  | $ | (7 | ) |  | $ | 4,768 |
Mortgage-Backed Securities – Commercial | 16,843 |  |  | — |  |  | (247 | ) |  | 16,596 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 315,609 |  |  | 30 |  |  | (1,824 | ) |  | 313,815 |
Mortgage-Backed Securities – Commercial | 15,187 |  |  | — |  |  | (178 | ) |  | 15,009 |
Obligations of States and Political Subdivisions | 31,910 |  |  | 301 |  |  | (58 | ) |  | 32,153 |
Total Securities Held to Maturity | $ | 384,324 |  |  | $ | 331 |  |  | $ | (2,314 | ) |  | $ | 382,341 |
Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale | The amortized cost and estimated fair value of debt securities available for sale at December 31, 2015, by contractual maturity, are shown below:
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 2,601 |  |  | $ | 2,595 |
Due after 1 but within 5 years | 16,600 |  |  | 16,523 |
Due after 5 but within 10 years | 27,066 |  |  | 27,598 |
Due after 10 years | 44,136 |  |  | 37,977 |
| 90,403 |  |  | 84,693 |
Mortgage-Backed Securities (a) | 798,538 |  |  | 799,697 |
Total Debt Securities | $ | 888,941 |  |  | $ | 884,390 |
(a) | Mortgage Backed Securities include an amortized cost of $20.0 million and a fair value of $22.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $778.5 million and a fair value of $777.6 million
Below is an analysis of the amortized cost and fair values of securities available for sale at December 31:
| 2015 |  | 2014
| 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 | $ | 20,034 |  |  | $ | 2,071 |  |  | $ | (13 | ) |  | $ | 22,092 |  |  | $ | 23,344 |  |  | $ | 2,595 |  |  | $ | (3 | ) |  | $ | 25,936 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 778,476 |  |  | 7,983 |  |  | (8,882 | ) |  | 777,577 |  |  | 947,635 |  |  | 13,076 |  |  | (9,830 | ) |  | 950,881 |
Mortgage-Backed Securities – Commercial | 28 |  |  | — |  |  | — |  |  | 28 |  |  | 72 |  |  | 2 |  |  | — |  |  | 74 |
Other Government-Sponsored Enterprises | 19,201 |  |  | 2 |  |  | (85 | ) |  | 19,118 |  |  | 269,181 |  |  | 4 |  |  | (1,308 | ) |  | 267,877 |
Obligations of States and Political Subdivisions | 27,066 |  |  | 532 |  |  | — |  |  | 27,598 |  |  | 27,058 |  |  | 362 |  |  | (43 | ) |  | 27,377 |
Corporate Securities | 1,897 |  |  | 422 |  |  | — |  |  | 2,319 |  |  | 6,682 |  |  | 573 |  |  | — |  |  | 7,255 |
Pooled Trust Preferred Collateralized Debt Obligations | 42,239 |  |  | 916 |  |  | (7,497 | ) |  | 35,658 |  |  | 41,926 |  |  | 309 |  |  | (13,236 | ) |  | 28,999 |
Total Debt Securities | 888,941 |  |  | 11,926 |  |  | (16,477 | ) |  | 884,390 |  |  | 1,315,898 |  |  | 16,921 |  |  | (24,420 | ) |  | 1,308,399 |
Equities | 2,170 |  |  | — |  |  | — |  |  | 2,170 |  |  | 1,420 |  |  | — |  |  | — |  |  | 1,420 |
Total Securities Available for Sale | $ | 891,111 |  |  | $ | 11,926 |  |  | $ | (16,477 | ) |  | $ | 886,560 |  |  | $ | 1,317,318 |  |  | $ | 16,921 |  |  | $ | (24,420 | ) |  | $ | 1,309,819 |
Proceeds from Sale, Gross Gains (Losses) Realized on Sales, Maturities and Other-Than-Temporary Impairment Charges Related to Securities Available for Sale |
(a) | Mortgage Backed Securities include an amortized cost of $20.0 million and a fair value of $22.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $778.5 million and a fair value of $777.6 million
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of debt securities held to maturity at December 31, 2015, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers 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 | $ | — |  |  | $ | — |
Due after 1 but within 5 years | 108 |  |  | 108 |
Due after 5 but within 10 years | 27,224 |  |  | 27,487 |
Due after 10 years | 4,578 |  |  | 4,558 |
| 31,910 |  |  | 32,153 |
Mortgage-Backed Securities (a) | 352,414 |  |  | 350,188 |
Total Debt Securities | $ | 384,324 |  |  | $ | 382,341 |
(a) | Mortgage Backed Securities include an amortized cost of $21.6 million and a fair value of $21.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $330.8 million and a fair value of $328.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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