| 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, 2020 | | | | | | | | December 31, 2019 | | | | | | | | | 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 | $ | 7,395 | | | $ | 721 | | | $ | — | | | $ | 8,116 | | | $ | 7,745 | | | $ | 596 | | | $ | — | | | $ | 8,341 | | | Mortgage-Backed Securities – Commercial | 235,884 | | | 5,088 | | | (215) | | | 240,757 | | | 186,316 | | | 2,983 | | | (166) | | | 189,133 | | | Obligations of U.S. Government-Sponsored Enterprises: | | | | | | | | | | | | | | | | | | | Mortgage-Backed Securities – Residential | 670,251 | | | 18,973 | | | — | | | 689,224 | | | 660,777 | | | 4,113 | | | (2,943) | | | 661,947 | | | | | | | | | | | | | | | | | | | Other Government-Sponsored Enterprises | 1,000 | | | 4 | | | — | | | 1,004 | | | 1,000 | | | — | | | — | | | 1,000 | | | Obligations of States and Political Subdivisions | 9,891 | | | 136 | | | — | | | 10,027 | | | 17,738 | | | 171 | | | — | | | 17,909 | | | Corporate Securities | 22,924 | | | 574 | | | — | | | 23,498 | | | 22,919 | | | 1,043 | | | — | | | 23,962 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total Securities Available for Sale | $ | 947,345 | | | $ | 25,496 | | | $ | (215) | | | $ | 972,626 | | | $ | 896,495 | | | $ | 8,906 | | | $ | (3,109) | | | $ | 902,292 | |
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| 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, 2020, by contractual maturity, are shown below. | | | | | | | | | | | | | Amortized
Cost | | Estimated
Fair Value | | | (dollars in thousands) | | | | Due within 1 year | $ | 5,597 | | | $ | 5,601 | | | Due after 1 but within 5 years | 23,248 | | | 23,536 | | | Due after 5 but within 10 years | 4,970 | | | 5,392 | | | Due after 10 years | — | | | — | | | 33,815 | | | 34,529 | | | Mortgage-Backed Securities (a) | 913,530 | | | 938,097 | | | Total Debt Securities | $ | 947,345 | | | $ | 972,626 | |
(a)Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. Mortgage-Backed Securities include an amortized cost of $243.3 million and a fair value of $248.9 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $670.3 million and a fair value of $689.2 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac
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| 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: | | | | | | | | | | | | | 2020 | | 2019 | | | (dollars in thousands) | | | | Proceeds from sales | $ | — | | | $ | — | | | Gross gains (losses) realized: | | | | | Sales transactions: | | | | | Gross gains | $ | — | | | $ | — | | | Gross losses | — | | | — | | | — | | | — | | | Maturities | | | | | Gross gains | 19 | | | — | | | Gross losses | — | | | — | | | | | | | 19 | | | — | | | Net gains and impairment | $ | 19 | | | $ | — | |
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