The amortized cost, gross unrealized gains, gross unrealized losses and approximate fair value of securities available for sale consisted of the following:

The amortized cost and fair value of available-for-sale securities, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

The carrying value of investment and mortgage-backed securities pledged as collateral to secure public deposits and securities sold under agreements to repurchase amounted to $124.2 million and $114.1 million at June 30, 2018 and 2017, respectively. The securities pledged consist of marketable securities, including $8.4 million and $6.5 million of U.S. Government and Federal Agency Obligations, $39.8 million and $50.5 million of Mortgage-Backed Securities, $41.5 million and $19.9 million of Collateralized Mortgage Obligations, $34.2 million and $36.8 million of State and Political Subdivisions Obligations, and $300,000 and $400,000 of Other Securities at June 30, 2018 and 2017, respectively.

Gains of $491,500 and losses of $157,105 were recognized from sales of available-for-sale securities in 2018. There were no sales of available-for-sale securities in 2017.

The Company did not hold any securities of a single issuer, payable from and secured by the same source of revenue or taxing authority, the book value of which exceeded 10% of stockholders’ equity at June 30, 2018.

Certain investments in debt securities are reported in the financial statements at an amount less than their historical cost. Total fair value of these investments at June 30, 2018, was $124.9 million, which is approximately 85.4% of the Company’s available for sale investment portfolio, as compared to $52.3 million or approximately 36.2% of the Company’s available for sale investment portfolio at June 30, 2017. Except as discussed below, management believes the declines in fair value for these securities to be temporary.

The tables below show our investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2018 and 2017.

	Less than 12 months		12 months or more		Total
		Unrealized		Unrealized		Unrealized
For the year ended June 30, 2018	Fair Value	Losses	Fair Value	Losses	Fair Value	Losses
(dollars in thousands)
U.S. government-sponsored enterprises (GSEs)	$ 5,957	$ 58	$ 3,427	$ 70	$ 9,384	$ 128
Obligations of state and political subdivisions	14,861	224	8,526	256	23,387	480
Other securities	982	10	1,109	183	2,091	193
Mortgage-backed securities	65,863	1,513	24,187	1,020	90,050	2,533
Total investments and mortgage-backed securities	$ 87,663	$ 1,805	$ 37,249	$ 1,529	$ 124,912	$ 3,334


	Less than 12 months		12 months or more		Total
		Unrealized		Unrealized		Unrealized
For the year ended June 30, 2017	Fair Value	Losses	Fair Value	Losses	Fair Value	Losses
(dollars in thousands)
U.S. government-sponsored enterprises (GSEs)	$ 6,457	$ 12	$ -	$ -	$ 6,457	$ 12
Obligations of state and political subdivisions	12,341	127	256	-	12,597	127
Other securities	-	-	1,160	598	1,160	598
Mortgage-backed securities	29,836	267	2,285	36	32,121	303
Total investments and mortgage-backed securities	$ 48,634	$ 406	$ 3,701	$ 634	$ 52,335	$ 1,040

The unrealized losses on the Company’s investments in U.S. government-sponsored enterprises, mortgage-backed securities, and obligations of state and political subdivisions were caused by increases in market interest rates. The contractual terms of these instruments do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investments. Because the Company does not intend to sell the investments and it is not more likely than not the Company will be required to sell the investments before recovery of their amortized cost basis, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired at June 30, 2018.

Other securities. At June 30, 2018, there were 2 pooled trust preferred securities with an estimated fair value of $795,000 and unrealized losses of $176,000 in a continuous unrealized loss position for twelve months or more. These unrealized losses were primarily due to the long-term nature of the pooled trust preferred securities and a reduced demand for these securities, and concerns regarding the financial institutions that issued the underlying trust preferred securities. Rules adopted by the federal banking agencies in December 2013 to implement Section 619 of the Dodd-Frank Act (the “Volcker Rule”) generally prohibit banking entities from engaging in proprietary trading and from investing in, sponsoring, or having certain relationships with a hedge fund or private equity fund. The pooled trust preferred securities owned by the Company were included in a January 2014 listing of securities which the agencies considered to be grandfathered with regard to these prohibitions; as such, banking entities are permitted to retain their interest in these securities, provided the interest was acquired on or before December 10, 2013, unless acquired pursuant to a merger or acquisition.

The June 30, 2018, cash flow analysis for these two securities indicated it is probable the Company will receive all contracted principal and related interest projected. The cash flow analysis used in making this determination was based on anticipated default, recovery, and prepayment rates, and the resulting cash flows were discounted based on the yield spread anticipated at the time the securities were purchased. Other inputs include the actual collateral attributes, which include credit ratings and other performance indicators of the underlying financial institutions, including profitability, capital ratios, and asset quality. Assumptions for these two securities included prepayments averaging 1.4 percent, annually, annual defaults averaging 65 basis points, and a recovery rate averaging 6.5 percent of gross defaults, lagged two years.

One of these two securities has continued to receive cash interest payments in full since our purchase; the other security received principal-in-kind (PIK), in lieu of cash interest, for a period of time following the recession and financial crisis which began in 2008, but resumed cash interest payments during fiscal 2014. Our cash flow analysis indicates that cash interest payments are expected to continue for the securities. Because the Company does not intend to sell these securities and it is not more-likely-than-not that the Company will be required to sell these securities prior to recovery of their amortized cost basis, which may be maturity, the Company does not consider these investments to be other-than-temporarily impaired at June 30, 2018.

The Company does not believe any other individual unrealized loss as of June 30, 2018, represents OTTI. However, the Company could be required to recognize OTTI losses in future periods with respect to its available for sale investment securities portfolio. The amount and timing of any required OTTI will depend on the decline in the underlying cash flows of the securities. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized in the period the other-than-temporary impairment is identified.

Credit losses recognized on investments. During fiscal 2009, the Company adopted ASC 820, formerly FASB Staff Position 157-4, “Determining Fair Value When the Volume and Level of Activity for the Asset or Liability Have Significantly Decreased and Identifying Transactions That Are Not Orderly.” The following table provides information about the trust preferred security for which only a credit loss was recognized in income and other losses are recorded in other comprehensive income (loss) for the years ended June 30, 2018 and 2017.

	Accumulated Credit Losses
	Twelve-Month Period Ended
(dollars in thousands)	June 30,
	2018	2017
Credit losses on debt securities held
Beginning of period	$ 340	$ 352
Additions related to OTTI losses not previously recognized	-	-
Reductions due to sales	(333)	-
Reductions due to change in intent or likelihood of sale	-	-
Additions related to increases in previously-recognized OTTI losses	-	-
Reductions due to increases in expected cash flows	(7)	(12)
End of period	$ -	$ 340