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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items] |
Analysis of Amortized Cost and Estimated Fair Value of Securities Available for Sale | Below is an analysis of the amortized cost and estimated fair values of securities available for sale at:
| March 31, 2018 |  | December 31, 2017
| 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 | $ | 10,100 |  |  | $ | 646 |  |  | $ | (81 | ) |  | $ | 10,665 |  |  | $ | 10,556 |  |  | $ | 789 |  |  | $ | (7 | ) |  | $ | 11,338 |
Mortgage-Backed Securities – Commercial | 73,389 |  |  | — |  |  | (1,252 | ) |  | 72,137 |  |  | 24,611 |  |  | — |  |  | (462 | ) |  | 24,149 |
Obligations of U.S. Government-Sponsored Enterprises: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed Securities – Residential | 681,343 |  |  | 1,913 |  |  | (18,468 | ) |  | 664,788 |  |  | 632,422 |  |  | 2,622 |  |  | (9,489 | ) |  | 625,555 |
Other Government-Sponsored Enterprises | 1,100 |  |  | — |  |  | (2 | ) |  | 1,098 |  |  | 1,098 |  |  | — |  |  | (1 | ) |  | 1,097 |
Obligations of States and Political Subdivisions | 27,086 |  |  | 121 |  |  | (46 | ) |  | 27,161 |  |  | 27,083 |  |  | 327 |  |  | — |  |  | 27,410 |
Corporate Securities | 20,898 |  |  | 542 |  |  | (214 | ) |  | 21,226 |  |  | 15,907 |  |  | 590 |  |  | (4 | ) |  | 16,493 |
Pooled Trust Preferred Collateralized Debt Obligations | 13,602 |  |  | 1,252 |  |  | (722 | ) |  | 14,132 |  |  | 27,499 |  |  | 526 |  |  | (4,379 | ) |  | 23,646 |
Total Debt Securities | 827,518 |  |  | 4,474 |  |  | (20,785 | ) |  | 811,207 |  |  | 739,176 |  |  | 4,854 |  |  | (14,342 | ) |  | 729,688 |
Equities | 1,670 |  |  | — |  |  | — |  |  | 1,670 |  |  | 1,670 |  |  | — |  |  | — |  |  | 1,670 |
Total Securities Available for Sale | $ | 829,188 |  |  | $ | 4,474 |  |  | $ | (20,785 | ) |  | $ | 812,877 |  |  | $ | 740,846 |  |  | $ | 4,854 |  |  | $ | (14,342 | ) |  | $ | 731,358 |
Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale | The amortized cost and estimated fair value of debt securities available for sale at March 31, 2018, by contractual maturity, are shown below.
| Amortized Cost |  | Estimated Fair Value
| (dollars in thousands)
Due within 1 year | $ | 5,099 |  |  | $ | 5,073 |
Due after 1 but within 5 years | 15,727 |  |  | 15,541 |
Due after 5 but within 10 years | 26,337 |  |  | 26,409 |
Due after 10 years | 15,523 |  |  | 16,594 |
| 62,686 |  |  | 63,617 |
Mortgage-Backed Securities (a) | 764,832 |  |  | 747,590 |
Total Debt Securities | $ | 827,518 |  |  | $ | 811,207 |
(a) | Mortgage-Backed Securities include an amortized cost of $83.5 million and a fair value of $82.8 million for Obligations of U.S.
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 three months ended March 31:
| 2018 |  | 2017
| (dollars in thousands)
Proceeds from sales | $ | — |  |  | $ | — |
Gross gains (losses) realized: |  |  |
Sales Transactions: |  |  |
Gross gains | $ | — |  |  | $ | — |
Gross losses | — |  |  | — |
| — |  |  | — |
Maturities and impairment |  |  |
Gross gains | 2,840 |  |  | 652 |
Gross losses | — |  |  | — |
| 2,840 |  |  | 652 |
Net gains and impairment | $ | 2,840 |  |  | $ | 652 |

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