4. Investment Securities

Summary information regarding the Company’s investment securities classified as available for sale and held to maturity as of September 30, 2017 and December 31, 2016 is as follows.


*(dollars in thousands)*	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses				Fair Value
					Less Than 1 Year		Over 1 Year
September 30, 2017
Available for sale:
U.S. agency mortgage-backed	$	74,699	$	835	$	223	$	57	$	75,254
Collateralized mortgage obligations		100,666		108		517		384		99,873
Municipal bonds		18,202		292		1		—		18,493
U.S. government agency		8,509		74		7		—		8,576

Total available for sale	$	202,076	$	1,309	$	748	$	441	$	202,196

Held to maturity:
Municipal bonds	$	13,118	$	144	$	16	$	—	$	13,246

Total held to maturity	$	13,118	$	144	$	16	$	—	$	13,246


*(dollars in thousands)*	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses				Fair Value
					Less Than 1 Year		Over 1 Year
December 31, 2016
Available for sale:
U.S. agency mortgage-backed	$	78,361	$	938	$	368	$	—	$	78,931
Collateralized mortgage obligations		75,193		84		613		334		74,330
Municipal bonds		21,212		260		44		—		21,428
U.S. government agency		8,946		95		—		—		9,041

Total available for sale	$	183,712	$	1,377	$	1,025	$	334	$	183,730

Held to maturity:
Municipal bonds	$	13,365	$	69	$	72	$	—	$	13,362

Total held to maturity	$	13,365	$	69	$	72	$	—	$	13,362

The estimated fair value and amortized cost by contractual maturity of the Company’s investment securities as of September 30, 2017 are shown in the following tables. Securities are classified according to their contractual maturities without consideration of principal amortization, potential prepayments or call options. The expected maturity of a security may differ from its contractual maturity because of prepayments or the exercise of call options. Accordingly, actual maturities may differ from contractual maturities.


*(dollars in thousands)*	One Year or Less		One Year to Five Years		Five to Ten Years		Over Ten Years		Total
Fair Value
Securities available for sale:
U.S. agency mortgage-backed	$	97	$	5,935	$	33,317	$	35,905	$	75,254
Collateralized mortgage obligations		—		1,732		6,659		91,482		99,873
Municipal bonds		1,541		9,560		6,864		528		18,493
U.S. government agency		1,002		5,001		2,573		—		8,576

Total available for sale	$	2,640	$	22,228	$	49,413	$	127,915		202,196

Securities held to maturity:
Municipal bonds	$	—	$	5,418	$	6,187	$	1,641	$	13,246

Total investment securities	$	2,640	$	27,646	$	55,600	$	129,556	$	215,442


*(dollars in thousands)*	One Year or Less		One Year to Five Years		Five to Ten Years		Over Ten Years		Total
Amortized Cost
Securities available for sale:
U.S. agency mortgage-backed	$	95	$	5,916	$	33,322	$	35,366	$	74,699
Collateralized mortgage obligations		—		1,722		6,720		92,224		100,666
Municipal bonds		1,536		9,403		6,758		505		18,202
U.S. government agency		1,000		4,995		2,514		—		8,509

Total available for sale	$	2,631	$	22,036	$	49,314	$	128,095	$	202,076

Securities held to maturity:
Municipal bonds	$	—	$	5,369	$	6,118	$	1,631	$	13,118

Total investment securities	$	2,631	$	27,405	$	55,432	$	129,726	$	215,194

Management evaluates securities for other-than-temporary impairment at least quarterly, and more frequently when economic and market conditions warrant such evaluations. Consideration is given to (1) the extent and length of time the fair value has been below cost; (2) the reasons for the decline in value; and (3) the Company’s intent to sell a security or whether it is more likely than not the Company will be required to sell the security before the recovery of its amortized cost, which may extend to maturity.

The Company performs a process to identify securities that could potentially have a credit impairment that is other-than-temporary. This process involves evaluating each security for impairment by monitoring credit performance, collateral type, collateral geography, bond credit support, loan-to-value ratios, credit scores, loss severity levels, pricing levels, downgrades by rating agencies, cash flow projections and other factors as indicators of potential credit issues. When the Company determines that a security is deemed other-than-temporarily impaired, an impairment loss is recognized.

As of September 30, 2017, 65 of the Company’s debt securities had unrealized losses totaling 1.1% of the individual securities’ amortized cost basis and 0.6% of the Company’s total amortized cost basis of the investment securities portfolio. At such date, 18 of the 65 securities had been in a continuous loss position for over 12 months. The 18 securities had an aggregate amortized cost basis of $22.9 million and an unrealized loss of $441,000 at September 30, 2017. Management has the intent and ability to hold these debt securities until maturity, or until anticipated recovery; hence, no declines in these 65 securities were deemed other-than-temporary at September 30, 2017.

As of September 30, 2017 and December 31, 2016, the Company had $102,401,000 and $91,773,000, respectively, of securities pledged to secure public deposits.