Debt Securities Held-to-Maturity

The following is a summary of debt securities held-to-maturity at September 30, 2018, and December 31, 2017 (in thousands):



	September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	9,560	$	—	$	374	$	9,186
Total securities held-to-maturity	$	9,560	$	—	$	374	$	9,186



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	9,931	$	17	$	56	$	9,892
Total securities held-to-maturity	$	9,931	$	17	$	56	$	9,892

Contractual maturities for mortgage-backed securities are not presented, as expected maturities on mortgage‑backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. There were no sales of held-to-maturity securities for the three and nine months ended September 30, 2018, or September 30, 2017.

At September 30, 2018, debt securities held-to-maturity with a carrying value of $7.0 million were pledged to secure borrowings and deposits.

Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2018 and December 31, 2017, were as follows (in thousands):



	September 30, 2018
	Less than 12 months				12 months or more				Total
	Unrealized losses		Estimated fair value		Unrealized losses		Estimated fair value		Unrealized losses		Estimated fair value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	194	$	5,643	$	180	$	3,543	$	374	$	9,186
Total securities held-to-maturity	$	194	$	5,643	$	180	$	3,543	$	374	$	9,186



	December 31, 2017
	Less than 12 months				12 months or more				Total
	Unrealized losses		Estimated fair value		Unrealized losses		Estimated fair value		Unrealized losses		Estimated fair value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	7	$	3,922	$	49	$	3,735	$	56	$	7,657
Total securities held-to-maturity	$	7	$	3,922	$	49	$	3,735	$	56	$	7,657

The Company held two pass-through mortgage-backed securities held-to-maturity, issued or guaranteed by GSEs that were in a continuous unrealized loss position of greater than twelve months at September 30, 2018, and four pass-through mortgage-backed securities held-to-maturity, issued or guaranteed by GSEs that were in a continuous unrealized loss position of less than twelve months at September 30, 2018. Management evaluated these securities and concluded that the declines in value relate to the general interest rate environment and are considered temporary. The securities cannot be prepaid in a manner that would result in the Company not receiving substantially all of its amortized cost. The Company neither has an intent to sell, nor is it more likely than not that the Company will be required to sell, the securities before the recovery of their amortized cost basis or, if necessary, maturity.

The fair values of our investment securities could decline in the future if the underlying performance of the collateral for the collateralized mortgage obligations or other securities deteriorates and our credit enhancement levels do not provide sufficient protections to our contractual principal and interest. As a result, there is a risk that significant other-than-temporary impairments may occur in the future given the current economic environment. The Company did not recognize any other-than-temporary impairment charges in earnings on securities held-to-maturity during the three and nine months ended September 30, 2018, or September 30, 2017.