3. Investment Securities

The amortized cost, fair values, and unrealized gains and losses of the securities available-for-sale are as follows (in thousands):

	Amortized		Gross Unrealized				Fair/Book
March 31, 2020	Cost		Gains		Losses		Value
US Treasury Notes	$	14,777	$	622	$	-		15,399
US Govt SBA		10,043		9		98		9,954
Mortgage Backed Securities⁽¹⁾		482,439		18,945		8		501,376
Other		5,517		-		-		5,517
Total	$	512,776	$	19,576	$	106	$	532,246

	Amortized		Gross Unrealized				Fair/Book
December 31, 2019	Cost		Gains		Losses		Value
US Treasury Notes	$	54,745	$	250	$	-	$	54,995
US Govt SBA		10,902		9		113		10,798
Mortgage Backed Securities⁽¹⁾		436,531		4,646		99		441,078
Other		515		-		-		515
Total	$	502,693	$	4,905	$	212	$	507,386

	Amortized		Gross Unrealized				Fair/Book
March 31, 2019	Cost		Gains		Losses		Value
Government Agency & Government-Sponsored Entities	$	3,021	$	6	$	-	$	3,027
US Treasury Notes		164,660		48		34		164,674
US Govt SBA		14,554		5		147		14,412
Mortgage Backed Securities⁽¹⁾		303,895		1,764		1,639		304,020
Other		5,156		-		-		5,156
Total	$	491,286	$	1,823	$	1,820	$	491,289

⁽¹⁾All Mortgage Backed Securities consist of securities collateralized by residential real estate and were issued by an agency or government sponsored entity of the U.S. government.

The book values, estimated fair values and unrealized gains and losses of investments classified as held-to-maturity are as follows (in thousands):

	Book		Gross Unrealized				Fair
March 31, 2020	Value		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	58,701	$	812	$	10	$	59,503
Total	$	58,701	$	812	$	10	$	59,503

	Book		Gross Unrealized				Fair
December 31, 2019	Value		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	60,229	$	880	$	12	$	61,097
Total	$	60,229	$	880	$	12	$	61,097

	Book		Gross Unrealized				Fair
March 31, 2019	Value		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	54,412	$	571	$	1	$	54,982
Total	$	54,412	$	571	$	1	$	54,982

Fair values are based on quoted market prices or dealer quotes. If a quoted market price or dealer quote is not available, fair value is estimated using quoted market prices for similar securities.

The amortized cost and estimated fair values of investment securities at March 31, 2020 by contractual maturity are shown in the following table (in thousands):

	Available-for-Sale				Held-to-Maturity
March 31, 2020	Amortized Cost		Fair/Book Value		Book Value		Fair Value
Within one year	$	5,574	$	5,574	$	3,980	$	3,980
After one year through five years		15,092		15,713		4,894		4,899
After five years through ten years		829		829		24,064		24,783
After ten years		8,842		8,754		25,763		25,841
		30,337		30,870		58,701		59,503

Investment securities not due at a single maturity date:
Mortgage-backed securities		482,439		501,376		-		-

Total	$	512,776	$	532,246	$	58,701	$	59,503

Expected maturities of mortgage-backed securities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

The following tables show those investments with gross unrealized losses and their market value aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at the dates indicated (in thousands):

	Less Than 12 Months				12 Months or More				Total
March 31, 2020	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss

Securities Available-for-Sale
US Govt SBA	$	2,458	$	5	$	4,674	$	93	$	7,132	$	98
Mortgage Backed Securities		1,503		2		255		6		1,758		8
Total	$	3,961	$	7	$	4,929	$	99	$	8,890	$	106

Securities Held-to-Maturity
Obligations of States and Political Subdivisions	$	728	$	10	$	-	$	-	$	728	$	10
Total	$	728	$	10	$	-	$	-	$	728	$	10

	Less Than 12 Months				12 Months or More				Total
December 31, 2019	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss

Securities Available-for-Sale
US Govt SBA	$	2,693	$	6	$	5,198	$	107	$	7,891	$	113
Mortgage Backed Securities		131,005		88		713		11		131,718		99
Total	$	133,698	$	94	$	5,911	$	118	$	139,609	$	212

Securities Held-to-Maturity
Obligations of States and Political Subdivisions	$	355	$	12	$	-	$	-	$	355	$	12
Total	$	355	$	12	$	-	$	-	$	355	$	12

	Less Than 12 Months				12 Months or More				Total
March 31, 2019	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss

Securities Available-for-Sale
US Treasury Notes	$	149,962	$	28	$	4,909	$	6	$	154,871	$	34
US Govt SBA		1,310		-		10,823		147		12,133		147
Mortgage Backed Securities		5,434		25		190,452		1,614		195,886		1,639
Total	$	156,706	$	53	$	206,184	$	1,767	$	362,890	$	1,820

Securities Held-to-Maturity
Obligations of States and Political Subdivisions	$	229	$	1	$	360	$	-	$	589	$	1
Total	$	229	$	1	$	360	$	-	$	589	$	1

As of March 31, 2020, the Company held 551 investment securities of which 25 were in an unrealized loss position for less than twelve months. 72 securities were in an unrealized position for twelve months or more. Management periodically evaluates each investment security for other-than-temporary impairment relying primarily on industry analyst reports and observations of market conditions and interest rate fluctuations. Management believes it will be able to collect all amounts due according to the contractual terms of the underlying investment securities.

U.S. Treasury Notes – At March 31, 2020, no U.S. Treasury Note security investments were in an unrealized loss position for less than 12 months and none were in an unrealized loss position for 12 months or more. The unrealized losses on the Company's investment in U.S. Treasury Notes were $0 at March 31, 2020 and December 31, 2019, and $34,000 at March 31, 2019. The unrealized losses were caused by interest rate fluctuations. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at March 31, 2020, December 31, 2019, and March 31, 2019.

U.S. Government SBA – At March 31, 2020, 16 U.S. Government SBA security investments were in an unrealized loss position for less than 12 months and 53 were in an unrealized loss position for 12 months or more. The unrealized losses on the Company's investment in U.S. Government SBA securities were $98,000 at March 31, 2020 and $113,000 at December 31, 2019, and $147,000 at March 31, 2019. The unrealized losses were caused by interest rate fluctuations. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at March 31, 2020, December 31, 2019, and March 31, 2019.

Mortgage Backed Securities – At March 31, 2020, 5 mortgage backed security investments were in an unrealized loss position for less than 12 months and 19 were in an unrealized loss position for 12 months or more. The unrealized losses on the Company's investment in mortgage backed securities were $8,000, $99,000, and $1.6 million at March 31, 2020, December 31, 2019, and March 31, 2019, respectively. The unrealized losses were caused by interest rate fluctuations. The contractual cash flows of these investments are guaranteed by an agency or government sponsored entity of the U.S. government. Accordingly, it is expected that the securities would not be settled at a price less than the amortized cost of the Company's investment. Because the decline in market value is attributable to changes in interest rates and not credit quality, and because the Company does not intend to sell the securities and it is more likely than not that the Company will not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at March 31, 2020, December 31, 2019, and March 31, 2019.

Obligations of States and Political Subdivisions - At March 31, 2020, 4 obligation of states and political subdivisions were in an unrealized loss position for less than 12 months. None were in an unrealized loss position for 12 months or more. As of March 31, 2020, one-hundred percent of the Company’s bank-qualified municipal bond portfolio was rated at either the issue or issuer level, and all of these ratings were “investment grade.” The Company monitors the status of all municipal investments in the portfolio and at the current time does not believe any of them to be exhibiting financial problems that could result in a loss in any individual security.

The unrealized losses on the Company’s investment in obligations of states and political subdivisions were $10,000, $12,000 and $1,000 at March 31, 2020, December 31, 2019 and March 31, 2019, respectively. Management believes that any unrealized losses on the Company's investments in obligations of states and political subdivisions were caused by interest rate fluctuations. The contractual terms of these investments do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. Because the Company does not intend to sell the securities and it is more likely than not that the Company would not have to sell the securities before recovery of their cost basis, the Company did not consider these investments to be other-than-temporarily impaired at March 31, 2020, December 31, 2019, and March 31, 2019.

Proceeds from sales and calls of securities for the periods shown were as follows:

(in thousands)	Proceeds		Gains		Losses
Three Months Ended March 31, 2020	$	2,255	$	13	$	-
Three Months Ended March 31, 2019	$	-	$	-	$	-

Pledged Securities

As of March 31, 2020, securities carried at $381.3 million were pledged to secure public deposits, Federal Home Loan Bank (“FHLB”) borrowings, and other government agency deposits as required by law. This amount was $352.5 million at December 31, 2019, and $262.1 million at March 31, 2019.