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.


			Gross		Gross
(In Thousands)	Amortized		Unrealized		Unrealized		Fair
Available-for-Sale Securities:	Cost		Gain		Loss		Value
June 30, 2015
GSE	$	29,033	$	35	$	15	$	29,053
CMO		254,596		773		2,033		253,336
FNMA MBS		302,595		1,002		2,472		301,125
FHLMC MBS		134,161		354		621		133,894
GNMA MBS		63,922		594		178		64,338

	$	784,307	$	2,758	$	5,319	$	781,746

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


			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(In Thousands)	Cost		Gain		Loss		Value
Held-to-Maturity Securities^(a)
June 30, 2015
State and political subdivisions	$	120,697	$	152	$	2,045	$	118,804

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 $3.2 million and $3.6 million at June 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 June 30, 2015 and December 31, 2014 are presented in the table below:


	Available-for-Sale
(In Thousands)	Amortized		Fair
June 30, 2015	Cost		Value
Within one year	$	3,000	$	3,001
After one year but within five years		29,032		29,024
After five years but within ten years		181,317		179,384
After ten years		570,958		570,337

	$	784,307	$	781,746

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)	Amortized		Fair
June 30, 2015	Cost		Value
Within one year	$	2,692	$	2,694
After one year but within five years		3,016		2,967
After five years but within ten years		9,278		9,319
After ten years		105,711		103,824

	$	120,697	$	118,804

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 $374.9 million and $470.4 million were pledged as collateral for retail customer repurchase agreements, municipal deposits, and other obligations as of June 30, 2015 and December 31, 2014, respectively. From time to time, investment securities are also pledged as collateral for FHLB borrowings. There were $3.0 million of FHLB pledged investment securities at June 30, 2015 and none pledged at December 31, 2014.

During the first six months of 2015 and 2014, we sold $88.2 million and $140.9 million of investment securities categorized as available-for-sale, for a gain of $928,000 and $943,000, respectively. No losses were incurred from sales that occurred during the first six months of 2015 and 2014.

As of June 30, 2015 and December 31, 2014, our investment securities portfolio had remaining unamortized premiums of $21.0 million and $22.4 million and unaccreted discounts of $136,000 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 June 30, 2015 and December 31, 2014:


	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer				Total
(In Thousands)	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
June 30, 2015	Value		Loss		Value		Loss		Value		Loss
GSE	$	13,035	$	15	$	—	$	—	$	13,035	$	15
CMO		123,638		1,244		28,247		789		151,885		2,033
FNMA MBS		184,403		2,472		—		—		184,403		2,472
FHLMC MBS		63,566		400		4,151		221		67,717		621
GNMA MBS		39,108		93		2,397		85		41,505		178
State and political subdivisions		97,355		2,045		—		—		97,355		2,045

Total temporarily impaired investments	$	521,105	$	6,269	$	34,795	$	1,095	$	555,900	$	7,364

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.

All securities, with the exception of two, were AA-rated or better at the time of purchase and remained investment grade at June 30, 2015. In December 2014, we purchased a BBB- bond with a fair market value of $1.3 million as part of a financing transaction for an ongoing lending relationship. All securities were evaluated for OTTI at June 30, 2015 and December 31, 2014. The result of this evaluation showed no OTTI as of June 30, 2015 or December 31, 2014. The weighted average duration of MBS was 4.6 years at June 30, 2015.

At June 30, 2015, we owned investment securities totaling $550.9 million in which the amortized cost basis exceeded fair value. Total unrealized losses on these securities were $7.4 million at June 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.