4. INVESTMENT SECURITIES

The following tables detail the amortized cost and the estimated fair value of our investment securities classified as available-for-sale and held-to-maturity. None of our investment securities are classified as trading.


(In Thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
Available-for-Sale Securities:
September 30, 2015
GSE	$	31,044	$	64	$	1	$	31,107
CMO		251,729		2,538		600		253,667
FNMA MBS		296,373		3,838		439		299,772
FHLMC MBS		109,327		1,271		124		110,474
GNMA MBS		60,930		834		53		61,711

	$	749,403	$	8,545	$	1,217	$	756,731

December 31, 2014
GSE	$	30,020	$	14	$	74	$	29,960
CMO		193,672		874		1,614		192,932
FNMA MBS		291,606		2,053		1,106		292,553
FHLMC MBS		146,742		672		532		146,882
GNMA MBS		77,364		701		268		77,797

	$	739,404	$	4,314	$	3,594	$	740,124


(In Thousands)	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss		Fair Value
Held-to-Maturity Securities ^(a)
September 30, 2015
State and political subdivisions	$	138,060	$	670	$	592	$	138,138

December 31, 2014
State and political subdivisions	$	126,168	$	3	$	—	$	126,171

^(a)

Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value at the time of transfer. The amortized cost of held-to-maturity securities included net unrealized gains of $3.1 million and $3.6 million at September 30, 2015 and December 31, 2014, respectively, related to securities transferred, which are offset in Accumulated Other Comprehensive Income, net of tax.

The scheduled maturities of investment securities available-for-sale and held-to-maturity at September 30, 2015 and December 31, 2014 are presented in the table below:


	Available-for-Sale
(In Thousands) September 30, 2015	Amortized Cost		Fair Value
Within one year	$	3,995	$	4,000
After one year but within five years		30,032		30,112
After five years but within ten years		192,473		194,009
After ten years		522,903		528,610

	$	749,403	$	756,731


December 31, 2014
Within one year	$	10,000	$	10,014
After one year but within five years		20,020		19,946
After five years but within ten years		134,453		133,395
After ten years		574,931		576,769

	$	739,404	$	740,124


	Held-to-Maturity
(In Thousands) September 30, 2015	Amortized Cost		Fair Value
Within one year	$	1,712	$	1,714
After one year but within five years		3,925		3,913
After five years but within ten years		7,964		8,053
After ten years		124,459		124,458

	$	138,060	$	138,138


December 31, 2014
Within one year	$	3,608	$	3,608
After one year but within five years		6,217		6,217
After five years but within ten years		9,733		9,736
After ten years		106,610		106,610

	$	126,168	$	126,171

MBS have expected maturities that differ from their contractual maturities. These differences arise because borrowers have the right to call or prepay obligations with or without a prepayment penalty.

Investment securities with fair market values aggregating $435.0 million and $470.4 million were pledged as collateral for retail customer repurchase agreements, municipal deposits, and other obligations as of September 30, 2015 and December 31, 2014, respectively.

During the first nine months of 2015 and 2014, we sold $117.3 million and $170.4 million of investment securities categorized as available-for-sale, for a gain of $1.0 million and $979,000, respectively. We incurred $1,000 in losses from sales during the first nine months of 2015. Sales resulted in no losses during the first nine months of 2014.

As of September 30, 2015 and December 31, 2014, our investment securities portfolio had remaining unamortized premiums of $19.6 million and $22.4 million and unaccreted discounts of $234,000 and $188,000, respectively.

For these investment securities with unrealized losses, the table below shows our gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at September 30, 2015 and December 31, 2014:


	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
(In Thousands) September 30, 2015	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
GSE	$	3,013	$	1	$	—	$	—	$	3,013	$	1
CMO		27,739		218		27,740		382		55,479		600
FNMA MBS		53,423		439		—		—		53,423		439
FHLMC MBS		4,814		3		4,149		121		8,963		124
GNMA MBS		1,943		1		2,409		52		4,352		53
State and political subdivisions		69,695		592		—		—		69,695		592

Total temporarily impaired investments	$	160,627	$	1,254	$	34,298	$	555	$	194,925	$	1,809


December 31, 2014
GSE	$	19,945	$	74	$	—	$	—	$	19,945	$	74
CMO		15,492		108		61,630		1,506		77,122		1,614
FNMA MBS		—		—		103,207		1,106		103,207		1,106
FHLMC MBS		23,901		54		58,267		478		82,168		532
GNMA MBS		—		—		48,312		268		48,312		268

Total temporarily impaired investments	$	59,338	$	236	$	271,416	$	3,358	$	330,754	$	3,594

There were no held-to-maturity investment securities in an unrealized loss position as of December 31, 2014.

At September 30, 2015, we owned investment securities totaling $194.9 million in which the amortized cost basis exceeded fair value. Total unrealized losses on these securities were $1.8 million at September 30, 2015. The temporary impairment is the result of changes in market interest rates subsequent to the purchase of the securities. Our investment portfolio is reviewed each quarter for indications of OTTI. This review includes analyzing the length of time and the extent to which the fair value has been lower than the amortized cost, the financial condition and near-term prospects of the issuer, including any specific events which may influence the operations of the issuer and our intent and ability to hold the investment for a period of time sufficient to allow for full recovery of the unrealized loss. We evaluate our intent and ability to hold securities based upon our investment strategy for the particular type of security and our cash flow needs, liquidity position, capital adequacy and interest rate risk position. In addition, we do not have the intent to sell, nor is it more likely-than-not we will be required to sell these securities before we are able to recover the amortized cost basis.

All securities, with the exception of two, were AA-rated or better at the time of purchase and remained investment grade at September 30, 2015. All securities were evaluated for OTTI at September 30, 2015 and December 31, 2014. The result of this evaluation showed no OTTI as of September 30, 2015 or December 31, 2014. The estimated weighted average duration of MBS was 4.3 years at September 30, 2015.