Investment Securities

The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2013 and 2012:



	Amortized		Unrealized		Unrealized			Fair Value
As of December 31, 2013	Cost		Gains		Losses			(Estimated)
Securities available for sale
Mortgage-backed securities	$	180,109,000	$	1,392,000	$	(3,772,000	)	$	177,729,000
State and political subdivisions	134,188,000		1,458,000		(9,331,000		)	126,315,000
Other equity securities	1,666,000		116,000		(2,000		)	1,780,000
	$	315,963,000	$	2,966,000	$	(13,105,000	)	$	305,824,000
Securities to be held to maturity
U.S. Government-sponsored agencies	$	92,280,000	$	1,000	$	(12,757,000	)	$	79,524,000
Mortgage-backed securities	35,712,000		1,440,000		(1,336,000		)	35,816,000
State and political subdivisions	40,985,000		1,823,000		(112,000		)	42,696,000
Corporate securities	300,000		—		—			300,000
	$	169,277,000	$	3,264,000	$	(14,205,000	)	$	158,336,000
Restricted equity securities
Federal Home Loan Bank Stock	$	12,875,000	$	—	$	—		$	12,875,000
Federal Reserve Bank Stock	1,037,000		—		—			1,037,000
	$	13,912,000	$	—	$	—		$	13,912,000



	Amortized		Unrealized		Unrealized			Fair Value
As of December 31, 2012	Cost		Gains		Losses			(Estimated)
Securities available for sale
Mortgage-backed securities	$	164,752,000	$	4,636,000	$	(295,000	)	$	169,093,000
State and political subdivisions	113,069,000		8,074,000		(199,000		)	120,944,000
Other equity securities	1,578,000		43,000		(44,000		)	1,577,000
	$	279,399,000	$	12,753,000	$	(538,000	)	$	291,614,000
Securities to be held to maturity
U.S. Government-sponsored agencies	$	60,919,000	$	242,000	$	(182,000	)	$	60,979,000
Mortgage-backed securities	39,193,000		2,850,000		(19,000		)	42,024,000
State and political subdivisions	42,908,000		4,036,000		—			46,944,000
Corporate securities	300,000		—		—			300,000
	$	143,320,000	$	7,128,000	$	(201,000	)	$	150,247,000
Restricted equity securities
Federal Home Loan Bank Stock	$	13,412,000	$	—	$	—		$	13,412,000
Federal Reserve Bank Stock	1,036,000		—		—			1,036,000
	$	14,448,000	$	—	$	—		$	14,448,000

The following table summarizes the contractual maturities of investment securities at December 31, 2013:



	Securities available for sale				Securities to be held to maturity
	Amortized Cost		Fair Value (Estimated)		Amortized Cost		Fair Value (Estimated)
Due in 1 year or less	$	717,000	$	721,000	$	268,000	$	273,000
Due in 1 to 5 years	20,547,000		20,636,000		6,420,000		6,790,000
Due in 5 to 10 years	16,114,000		16,267,000		33,442,000		33,828,000
Due after 10 years	276,919,000		266,420,000		129,147,000		117,445,000
Equity securities	1,666,000		1,780,000		—		—
	$	315,963,000	$	305,824,000	$	169,277,000	$	158,336,000

The following table summarizes the contractual maturities of investment securities at December 31, 2012:



	Securities available for sale				Securities to be held to maturity
In thousands of dollars	Amortized Cost		Fair Value (Estimated)		Amortized Cost		Fair Value (Estimated)
Due in 1 year or less	$	18,761,000	$	18,926,000	$	3,754,000	$	3,785,000
Due in 1 to 5 years	27,243,000		27,816,000		11,950,000		12,701,000
Due in 5 to 10 years	16,686,000		17,666,000		27,461,000		29,986,000
Due after 10 years	215,131,000		225,629,000		100,155,000		103,775,000
Equity securities	1,578,000		1,577,000		—		—
	$	279,399,000	$	291,614,000	$	143,320,000	$	150,247,000

At December 31, 2013, securities with a fair value of $147,074,000 were pledged to secure borrowings from the Federal Home Loan Bank of Boston, public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $154,817,000, as of December 31, 2012 pledged for the same purpose.

Gains and losses on the sale of securities available for sale are computed by subtracting the amortized cost at the time of sale from the security's selling price, net of accrued interest to be received.

The following table shows securities gains and losses for 2013, 2012 and 2011:



	2013		2012			2011
Proceeds from sales of securities	$	10,563,000	$	26,437,000		$	140,417,000
Gross realized gains	1,087,000		2,257,000			4,020,000
Gross realized losses	—		(289,000		)	(727,000		)
Net gain	$	1,087,000	$	1,968,000		$	3,293,000
Related income taxes	$	380,000	$	689,000		$	1,153,000

Management reviews securities with unrealized losses for other than temporary impairment. As of December 31, 2013, there were 304 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 32 had been temporarily impaired for 12 months or more. At the present time, there have been no material changes in the credit quality of these securities resulting in other than temporary impairment, and in Management's opinion, no additional write-down for other-than-temporary impairment is warranted.

Information regarding securities temporarily impaired as of December 31, 2013 is summarized below:



	Less than 12 months					12 months or more					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
As of December 31, 2013	Value		Losses			Value		Losses			Value		Losses
U.S. Government-sponsored agencies	$	78,724,000	$	(12,757,000	)	$	—	$	—		$	78,724,000	$	(12,757,000	)
Mortgage-backed securities	96,263,000		(4,977,000		)	5,451,000		(131,000		)	101,714,000		(5,108,000		)
State and political subdivisions	69,406,000		(7,895,000		)	7,150,000		(1,548,000		)	76,556,000		(9,443,000		)
Other equity securities	—		—			50,000		(2,000		)	50,000		(2,000		)
	$	244,393,000	$	(25,629,000	)	$	12,651,000	$	(1,681,000	)	$	257,044,000	$	(27,310,000	)

Information regarding securities temporarily impaired as of December 31, 2012 is summarized below:



	Less than 12 months					12 months or more					Total
	Fair		Unrealized			Fair		Unrealized			Fair		Unrealized
As of December 31, 2012	Value		Losses			Value		Losses			Value		Losses
U.S. Government-sponsored agencies	$	15,817,000	$	(182,000	)	$	—	$	—		$	15,817,000	$	(182,000	)
Mortgage-backed securities	9,982,000		(231,000		)	2,534,000		(83,000		)	12,516,000		(314,000		)
State and political subdivisions	8,621,000		(199,000		)	—		—			8,621,000		(199,000		)
Other equity securities	—		—			222,000		(44,000		)	222,000		(44,000		)
	$	34,420,000	$	(612,000	)	$	2,756,000	$	(127,000	)	$	37,176,000	$	(739,000	)

The Bank is a member of the Federal Home Loan Bank ("FHLB") of Boston, a cooperatively owned wholesale bank for housing and finance in the six New England States. As a requirement of membership in the FHLB, the Bank must own a minimum required amount of FHLB stock, calculated periodically based primarily on its level of borrowings from the FHLB. The Bank uses the FHLB for much of its wholesale funding needs. As of December 31, 2013 and December 31, 2012, the Bank's investment in FHLB stock totaled $12,875,000 and $13,412,000, respectively. FHLB stock is a restricted equity security and therefore is reported at cost, which equals par value.

The Company periodically evaluates its investment in FHLB stock for impairment based on, among other factors, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through December 31, 2013. The Bank will continue to monitor its investment in FHLB stock.