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Investment Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) security state	Dec. 31, 2014 USD ($) security	Dec. 31, 2013 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2012 USD ($)
Securities available for sale
Amortized Cost-Equity	$ 3,381	$ 2,490
Amortized Cost-Total	221,311	181,380
Unrealized Gains	2,758	4,567
Unrealized Losses	(1,030)	(686)
Fair Value Estimated	223,039	185,261
Proceeds from sales of securities	35,468	15,557	$ 10,563
Gross realized gains	1,399	1,155	1,087
Gross realized losses	0	0	0
Net gain	1,399	1,155	1,087
Related income taxes	490	404	380
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Fair Value	168,818	17,298
12 months or more, Fair Value	21,048	111,694
Total, Fair Value	189,866	128,992
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, Unrealized Losses	(2,525)	(74)
12 months or more, Unrealized Losses	(950)	(2,825)
Total, Unrealized Losses	(3,475)	(2,899)
Amortized cost of securities transferred				$ 89,780
Fair value of securities transferred				89,757
Unrealized loss on securities transferred				$ 15
Net unrealized loss on securities transferred from available for sale to held to maturity	$ 112	48	$ 0		$ 0
Number of states | state	6
FHLB stock	$ 13,220	12,875
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	240,023	275,919
Unrealized Gains	5,545	5,998
Unrealized Losses	(2,445)	(2,213)
Fair Value Estimated	243,123	279,704
Restricted equity securities, cost and FMV [Abstract]
Amortized Cost	14,257	13,912
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value Estimated	14,257	13,912
Securities available for sale, maturities amortized cost [Abstract]
Amortized cost, debt maturities, due in 1 year or less	527	2,309
Amortized cost, debt maturities, due in 1 to 5 years	7,562	15,200
Amortized cost, debt maturities, due in 5 to 10 years	19,647	18,547
Amortized cost, debt maturities, due after 10 years	190,194	142,834
Amortized cost, equity maturities	3,381	2,490
Amortized Cost-Total	221,311	181,380
Securities available for sale, maturities fair value estimated [Abstract]
Fair value, debt maturities, due in 1 year or less	530	2,329
Fair value, debt maturities, due in 1 to 5 years	7,727	15,499
Fair value, debt maturities, due in 5 to 10 years	20,055	19,124
Fair value, debt maturities, due after 10 years	191,304	145,758
Fair value, equity maturities	3,423	2,551
Fair Value Estimated	223,039	185,261
Securities to be held to maturity, maturities, amortized cost [Abstract]
Amortized cost, due in 1 year or less	1,814	1,693
Amortized cost, due in 1 to 5 years	6,306	8,467
Amortized cost, due in 5 to 10 years	58,397	50,629
Amortized cost, due after 10 years	173,506	215,130
Securities to be held to maturity (fair value of $243,123,000 at December 31, 2015, and $279,704,000 at December 31, 2014)	240,023	275,919
Securities to be held to maturity, Debt Maturities, Fair Value [Abstract]
Fair value, due in 1 year or less	1,850	1,713
Fair value, due in 1 to 5 years	6,514	8,702
Fair value, due in 5 to 10 years	60,196	52,717
Fair value, due after 10 years	174,563	216,572
Securities to be held to maturity, fair value	243,123	279,704
Fair value of securities pledged to secure borrowings from the Federal Home Loan Bank of Boston, public deposits, repurchase agreements, and for other purposes as required by law	$ 201,879	$ 164,919
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) | security	78	56
Number of securities temporarily impaired for 12 months or more (in number of securities) | security	15	36
Length of time for the temporary impairment (in months)	12 months	12 months
Federal Home Loan Bank Stock
Restricted equity securities, cost and FMV [Abstract]
Amortized Cost	$ 13,220	$ 12,875
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value Estimated	13,220	12,875
Federal Reserve Bank Stock
Restricted equity securities, cost and FMV [Abstract]
Amortized Cost	1,037	1,037
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value Estimated	1,037	1,037
U.S. Government-sponsored agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Fair Value	45,311	0
12 months or more, Fair Value	17,185	79,444
Total, Fair Value	62,496	79,444
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, Unrealized Losses	(1,469)	0
12 months or more, Unrealized Losses	(815)	(2,066)
Total, Unrealized Losses	(2,284)	(2,066)
Mortgage-backed securities
Securities available for sale
Amortized Cost-Debt	194,563	149,796
Unrealized Gains	1,509	2,637
Unrealized Losses	(962)	(578)
Fair Value Estimated	195,110	151,855
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Fair Value	120,915	13,878
12 months or more, Fair Value	910	29,182
Total, Fair Value	121,825	43,060
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, Unrealized Losses	(1,027)	(40)
12 months or more, Unrealized Losses	(71)	(654)
Total, Unrealized Losses	(1,098)	(694)
Securities available for sale, maturities fair value estimated [Abstract]
Fair Value Estimated	195,110	151,855
State and political subdivisions
Securities available for sale
Amortized Cost-Debt	23,367	29,094
Unrealized Gains	1,201	1,865
Unrealized Losses	(62)	(104)
Fair Value Estimated	24,506	30,855
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Fair Value	2,528	3,352
12 months or more, Fair Value	2,901	3,017
Total, Fair Value	5,429	6,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, Unrealized Losses	(24)	(31)
12 months or more, Unrealized Losses	(63)	(104)
Total, Unrealized Losses	(87)	(135)
Securities available for sale, maturities fair value estimated [Abstract]
Fair Value Estimated	24,506	30,855
Other equity securities
Securities available for sale
Amortized Cost-Equity	3,381	2,490
Unrealized Gains	48	65
Unrealized Losses	(6)	(4)
Fair Value Estimated	3,423	2,551
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, Fair Value	64	68
12 months or more, Fair Value	52	51
Total, Fair Value	116	119
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, Unrealized Losses	(5)	(3)
12 months or more, Unrealized Losses	(1)	(1)
Total, Unrealized Losses	(6)	(4)
Securities available for sale, maturities amortized cost [Abstract]
Amortized cost, equity maturities	3,381	2,490
Securities available for sale, maturities fair value estimated [Abstract]
Fair Value Estimated	3,423	2,551
U.S. Government-sponsored agencies
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	71,000	92,341
Unrealized Gains	40	54
Unrealized Losses	(2,284)	(2,066)
Fair Value Estimated	68,756	90,329
Securities to be held to maturity, maturities, amortized cost [Abstract]
Securities to be held to maturity (fair value of $243,123,000 at December 31, 2015, and $279,704,000 at December 31, 2014)	71,000	92,341
Securities to be held to maturity, Debt Maturities, Fair Value [Abstract]
Securities to be held to maturity, fair value	68,756	90,329
Mortgage-backed securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	42,193	57,003
Unrealized Gains	1,305	1,830
Unrealized Losses	(136)	(116)
Fair Value Estimated	43,362	58,717
Securities to be held to maturity, maturities, amortized cost [Abstract]
Securities to be held to maturity (fair value of $243,123,000 at December 31, 2015, and $279,704,000 at December 31, 2014)	42,193	57,003
Securities to be held to maturity, Debt Maturities, Fair Value [Abstract]
Securities to be held to maturity, fair value	43,362	58,717
State and political subdivisions
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	122,530	126,275
Unrealized Gains	4,200	4,114
Unrealized Losses	(25)	(31)
Fair Value Estimated	126,705	130,358
Securities to be held to maturity, maturities, amortized cost [Abstract]
Securities to be held to maturity (fair value of $243,123,000 at December 31, 2015, and $279,704,000 at December 31, 2014)	122,530	126,275
Securities to be held to maturity, Debt Maturities, Fair Value [Abstract]
Securities to be held to maturity, fair value	126,705	130,358
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	4,300	300
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value Estimated	4,300	300
Securities to be held to maturity, maturities, amortized cost [Abstract]
Securities to be held to maturity (fair value of $243,123,000 at December 31, 2015, and $279,704,000 at December 31, 2014)	4,300	300
Securities to be held to maturity, Debt Maturities, Fair Value [Abstract]
Securities to be held to maturity, fair value	$ 4,300	$ 300

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Available-for-Sale Securities, Transferred Security, at Carrying Value

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The number of States in New England where Federal Home Loan Bank do housing and financing services.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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