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Investment Securities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Securities available for sale      
Amortized Cost-Equity $ 1,578,000 $ 1,535,000  
Amortized Cost-Total 279,399,000 274,816,000  
Unrealized Gains 12,753,000 12,007,000  
Unrealized Losses (538,000) (621,000)  
Fair Value Estimated 291,614,000 286,202,000  
Proceeds from sales 26,437,000 140,417,000 202,000
Gross gains 2,257,000 4,020,000 2,000
Gross losses (289,000) (727,000) 0
Net gain 1,968,000 3,293,000 2,000
Related income taxes 689,000 1,153,000 1,000
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 34,420,000 14,627,000  
12 months or more, Fair Value 2,756,000 9,292,000  
Total, Fair Value 37,176,000 23,919,000  
Less than 12 months, Unrealized Losses (612,000) (162,000)  
12 months or more, Unrealized Losses (127,000) (634,000)  
Total, Unrealized Losses (739,000) (796,000)  
Number Of States in New England Where FHLB Serve 6    
Federal Home Loan Bank stock, at cost 13,412,000 14,031,000  
Balance at beginning of year 7,401,000 (2,057,000) (125,000)
Unrealized gains (losses) arising during the period 2,797,000 17,844,000 (2,971,000)
Realized (gains) losses during the period (1,968,000) (3,293,000) (2,000)
Related deferred taxes (290,000) (5,093,000) 1,041,000
Net change 539,000 9,458,000 (1,932,000)
Balance at end of year 7,940,000 7,401,000 (2,057,000)
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 143,320,000 122,661,000  
Unrealized Gains 7,128,000 8,191,000  
Unrealized Losses (201,000) (175,000)  
Fair Value Estimated 150,247,000 130,677,000  
Restricted equity securities, cost and FMV [Abstract]      
Amortized Cost 14,448,000 15,443,000  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Fair Value Estimated 14,448,000 15,443,000  
Securities available for sale, maturities amortized cost [Abstract]      
Amortized cost, debt maturities, due in 1 year or less 18,761,000 6,617,000  
Amortized cost, debt maturities, due in 1 to 5 years 27,243,000 18,792,000  
Amortized cost, debt maturities, due in 5 to 10 years 16,686,000 23,219,000  
Amortized cost, debt maturities, due after 10 years 215,131,000 224,653,000  
Amortized cost, equity maturities 1,578,000 1,535,000  
Amortized Cost-Total 279,399,000 274,816,000  
Fair value, debt maturities, due in 1 year or less 18,926,000 6,773,000  
Fair value, debt maturities, due in 1 to 5 years 27,816,000 19,473,000  
Fair value, debt maturities, due in 5 to 10 years 17,666,000 24,065,000  
Fair value, debt maturities, due after 10 years 225,629,000 234,458,000  
Fair value, equity maturities 1,577,000 1,433,000  
Fair Value Estimated 291,614,000 286,202,000  
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Amortized cost, due in 1 year or less 3,754,000 5,179,000  
Amortized cost, due in 1 to 5 years 11,950,000 10,085,000  
Amortized cost, due in 5 to 10 years 27,461,000 23,027,000  
Amortized cost, due after 10 years 100,155,000 84,370,000  
Total amortized cost, held to maturity securities 143,320,000 122,661,000  
Fair value, due in 1 year or less 3,785,000 5,227,000  
Fair value, due in 1 to 5 years 12,701,000 10,654,000  
Fair value, due in 5 to 10 years 29,986,000 24,694,000  
Fair value, due after 10 years 103,775,000 90,102,000  
Fair Value Estimated 150,247,000 130,677,000  
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 154,817,000 141,506,000  
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) 42    
Number of securities temporarily impaired for 12 months or more (in number of securities) 7    
Length of time for the temporary impairment (in months) 12M    
Federal Home Loan Bank Stock [Member]
      
Restricted equity securities, cost and FMV [Abstract]      
Amortized Cost 13,412,000 14,031,000  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Fair Value Estimated 13,412,000 14,031,000  
Federal Reserve Bank Stock [Member]
      
Restricted equity securities, cost and FMV [Abstract]      
Amortized Cost 1,036,000 1,412,000  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Fair Value Estimated 1,036,000 1,412,000  
US Treasury and Government [Member]
      
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 60,919,000 19,390,000  
Unrealized Gains 242,000 132,000  
Unrealized Losses (182,000) 0  
Fair Value Estimated 60,979,000 19,522,000  
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 60,919,000 19,390,000  
Fair Value Estimated 60,979,000 19,522,000  
Collateralized Mortgage Backed Securities [Member]
      
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 39,193,000 56,800,000  
Unrealized Gains 2,850,000 3,900,000  
Unrealized Losses (19,000) (3,000)  
Fair Value Estimated 42,024,000 60,697,000  
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 39,193,000 56,800,000  
Fair Value Estimated 42,024,000 60,697,000  
US States and Political Subdivisions Debt Securities [Member]
      
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 42,908,000 46,171,000  
Unrealized Gains 4,036,000 4,159,000  
Unrealized Losses 0 (172,000)  
Fair Value Estimated 46,944,000 50,158,000  
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 42,908,000 46,171,000  
Fair Value Estimated 46,944,000 50,158,000  
Corporate Debt Securities [Member]
      
Securities to be held to maturity, cost and FMV [Abstract]      
Amortized Cost 300,000 300,000  
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Fair Value Estimated 300,000 300,000  
Securities to be held to maturity, maturities, amortized cost [Abstract]      
Total amortized cost, held to maturity securities 300,000 300,000  
Fair Value Estimated 300,000 300,000  
US Treasury and Government [Member]
      
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 15,817,000 0  
12 months or more, Fair Value 0 0  
Total, Fair Value 15,817,000 0  
Less than 12 months, Unrealized Losses (182,000) 0  
12 months or more, Unrealized Losses 0 0  
Total, Unrealized Losses (182,000) 0  
Collateralized Mortgage Backed Securities [Member]
      
Securities available for sale      
Amortized Cost-Debt 164,752,000 191,924,000  
Unrealized Gains 4,636,000 6,486,000  
Unrealized Losses (295,000) (178,000)  
Fair Value Estimated 169,093,000 198,232,000  
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 9,982,000 12,489,000  
12 months or more, Fair Value 2,534,000 6,780,000  
Total, Fair Value 12,516,000 19,269,000  
Less than 12 months, Unrealized Losses (231,000) (25,000)  
12 months or more, Unrealized Losses (83,000) (156,000)  
Total, Unrealized Losses (314,000) (181,000)  
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 169,093,000 198,232,000  
US States and Political Subdivisions Debt Securities [Member]
      
Securities available for sale      
Amortized Cost-Debt 113,069,000 80,259,000  
Unrealized Gains 8,074,000 5,484,000  
Unrealized Losses (199,000) (17,000)  
Fair Value Estimated 120,944,000 85,726,000  
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 8,621,000 1,984,000  
12 months or more, Fair Value 0 1,667,000  
Total, Fair Value 8,621,000 3,651,000  
Less than 12 months, Unrealized Losses (199,000) (17,000)  
12 months or more, Unrealized Losses 0 (172,000)  
Total, Unrealized Losses (199,000) (189,000)  
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 120,944,000 85,726,000  
Corporate Debt Securities [Member]
      
Securities available for sale      
Amortized Cost-Debt 0 1,098,000  
Unrealized Gains 0 0  
Unrealized Losses 0 (287,000)  
Fair Value Estimated 0 811,000  
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 0 0  
12 months or more, Fair Value 0 811,000  
Total, Fair Value 0 811,000  
Less than 12 months, Unrealized Losses 0 0  
12 months or more, Unrealized Losses 0 (287,000)  
Total, Unrealized Losses 0 (287,000)  
Securities available for sale, maturities amortized cost [Abstract]      
Fair Value Estimated 0 811,000  
Other Equity Securities [Member]
      
Securities available for sale      
Amortized Cost-Equity 1,578,000 1,535,000  
Unrealized Gains 43,000 37,000  
Unrealized Losses (44,000) (139,000)  
Fair Value Estimated 1,577,000 1,433,000  
Temporarily Impaired Securities [Abstract]      
Less than 12 months, Fair Value 0 154,000  
12 months or more, Fair Value 222,000 34,000  
Total, Fair Value 222,000 188,000  
Less than 12 months, Unrealized Losses 0 (120,000)  
12 months or more, Unrealized Losses (44,000) (19,000)  
Total, Unrealized Losses (44,000) (139,000)  
Securities available for sale, maturities amortized cost [Abstract]      
Amortized cost, equity maturities 1,578,000 1,535,000  
Fair Value Estimated $ 1,577,000 $ 1,433,000