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Securities | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The amortized cost and fair value of securities available-for-sale at March 31, 2018 and December 31, 2017 are summarized as follows (in thousands):
|  | March 31, 2018
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Government-sponsored enterprises (GSEs) |  | $ | 30,147 |  |  | $ | — |  |  | $ | (844 | ) |  | $ | 29,303 |
Municipal securities |  | 10,141 |  |  | 10 |  |  | (265 | ) |  | 9,886 |
Other debt securities |  | 975 |  |  | — |  |  | (51 | ) |  | 924 |
Mortgage-backed securities (GSEs) |  | 118,386 |  |  | 195 |  |  | (2,484 | ) |  | 116,097 |
|  | $ | 159,649 |  |  | $ | 205 |  |  | $ | (3,644 | ) |  | $ | 156,210 |
Note 3. Securities, Continued
|  | December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Government-sponsored enterprises (GSEs) |  | $ | 26,207 |  |  | $ | 1 |  |  | $ | (432 | ) |  | $ | 25,776 |
Municipal securities |  | 9,122 |  |  | 28 |  |  | (147 | ) |  | 9,003 |
Other debt securities |  | 974 |  |  | — |  |  | (24 | ) |  | 950 |
Mortgage-backed securities (GSEs) |  | 117,263 |  |  | 136 |  |  | (1,184 | ) |  | 116,215 |
|  | $ | 153,566 |  |  | $ | 165 |  |  | $ | (1,787 | ) |  | $ | 151,944 |
At March 31, 2018 and December 31, 2017, securities with a fair value totaling approximately $83.4 million and $97.2 million, respectively were pledged to secure public funds and securities sold under agreements to repurchase. For the three months ended March 31, 2018 and March 31, 2017, there were no available-for-sale securities sold which resulted in no realized gross gains or losses. The amortized cost and estimated fair value of securities at March 31, 2018, by contractual maturity for non-mortgage backed securities, are shown below (in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 1,175 |  |  | $ | 1,175 |
Due from one year to five years |  | 21,606 |  |  | 21,011 |
Due from five years to ten years |  | 12,665 |  |  | 12,237 |
Due after ten years |  | 5,817 |  |  | 5,690 |
|  | 41,263 |  |  | 40,113 |
Mortgage-backed securities |  | 118,386 |  |  | 116,097 |
|  | $ | 159,649 |  |  | $ | 156,210 |
The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of March 31, 2018 and December 31, 2017 (in thousands):
|  | As of March 31, 2018
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 16,016 |  |  | $ | (281 | ) |  | $ | 13,287 |  |  | $ | (563 | ) |  | $ | 29,303 |  |  | $ | (844 | )
Municipal securities |  | 5,915 |  |  | (129 | ) |  | 2,077 |  |  | (136 | ) |  | 7,992 |  |  | (265 | )
Other debt securities |  | — |  |  | — |  |  | 924 |  |  | (51 | ) |  | 924 |  |  | (51 | )
Mortgage-backed securities (GSEs) |  | 60,316 |  |  | (1,389 | ) |  | 30,822 |  |  | (1,095 | ) |  | 91,138 |  |  | (2,484 | )
|  | $ | 82,247 |  |  | $ | (1,799 | ) |  | $ | 47,110 |  |  | $ | (1,845 | ) |  | $ | 129,357 |  |  | $ | (3,644 | )
Note 3. Securities, Continued
|  | As of December 31, 2017
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 1,358 |  |  | $ | (1 | ) |  | $ | 13,420 |  |  | $ | (431 | ) |  | $ | 14,778 |  |  | $ | (432 | )
Municipal securities |  | 3,418 |  |  | (43 | ) |  | 2,112 |  |  | (104 | ) |  | 5,530 |  |  | (147 | )
Other debt securities |  | 950 |  |  | (24 | ) |  | — |  |  | — |  |  | 950 |  |  | (24 | )
Mortgage-backed securities (GSEs) |  | 61,332 |  |  | (407 | ) |  | 35,048 |  |  | (777 | ) |  | 96,380 |  |  | (1,184 | )
|  | $ | 67,058 |  |  | $ | (475 | ) |  | $ | 50,580 |  |  | $ | (1,312 | ) |  | $ | 117,638 |  |  | $ | (1,787 | )
At March 31, 2018, the categories of temporarily impaired securities, and management’s evaluation of those securities, are as follows: U.S. Government-sponsored enterprises: At March 31, 2018, 9 (or nine) investments in U.S. GSE securities had unrealized losses. These unrealized losses related principally to changes in market interest rates. The contractual terms of the investments do not permit the issuer to settle the securities at a price less than the amortized cost bases of the investments. Because the Bank does not intend to sell the investments and it is more likely than not that the Bank will not be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other-than temporarily impaired at March 31, 2018. Municipal securities: At March 31, 2018, 19 (or nineteen) investments in obligations of municipal securities had unrealized losses. The Bank believes the unrealized losses on those investments were caused by the interest rate environment and do not relate to the underlying credit quality of the issuers. Because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not consider these investments to be other-than temporarily impaired at March 31, 2018. Other debt securities: At March 31, 2018, 1 (or one) investment in other debt securities had unrealized losses. The Bank believes the unrealized loss on this investment was caused by the interest rate environment and does not relate to the underlying credit quality of the issuer. Because the Bank does not intend to sell the investment and it is not more likely than not that the Bank will be required to sell the investment before recovery of its amortized cost bases, which may be maturity, the Bank does not consider this investment to be other-than temporarily impaired at March 31, 2018. Mortgage-backed securities: At March 31, 2018, 63 (or sixty three) investments in residential mortgage-backed securities had unrealized losses. This impairment is believed to be caused by the current interest rate environment. The contractual cash flows of those investments are guaranteed by an agency of the U.S. Government. Because the decline in market value is attributable to the current interest rate environment and not credit quality, and because the Bank does not intend to sell the investments and it is not more likely than not that the Bank will be required to sell the investments before recovery of their amortized cost bases, which may be maturity, the Bank does not deem these investments to be other-than-temporarily impaired at March 31, 2018.

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