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Investment Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Securities available for sale |  |  |  |  |
Amortized Cost-Equity | $ 1,563,000 | $ 534,000 | $ 1,563,000 | $ 534,000 | $ 1,535,000
Amortized Cost-Total | 285,303,000 | 314,236,000 | 285,303,000 | 314,236,000 | 274,816,000
Unrealized Gains | 14,820,000 | 13,341,000 | 14,820,000 | 13,341,000 | 12,007,000
Unrealized Losses | (223,000) | (795,000) | (223,000) | (795,000) | (621,000)
Fair Value Estimated | 299,900,000 | 326,782,000 | 299,900,000 | 326,782,000 | 286,202,000
Proceeds from sales | 300,000 | 6,000 | 25,437,000 | 75,182,000 |
Gross gains | 0 | 7,000 | 2,256,000 | 964,000 |
Gross losses | 0 | 1,000 | (289,000) | (727,000) |
Net gain | 0 | 8,000 | 1,967,000 | 237,000 |
Related income taxes | 0 | 3,000 | 688,000 | 83,000 |
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 15,315,000 | 13,568,000 | 15,315,000 | 13,568,000 | 14,627,000
12 months or more, Fair Value | 3,295,000 | 9,368,000 | 3,295,000 | 9,368,000 | 9,292,000
Total, Fair Value | 18,610,000 | 22,936,000 | 18,610,000 | 22,936,000 | 23,919,000
Less than 12 months, Unrealized Losses | (119,000) | (186,000) | (119,000) | (186,000) | (162,000)
12 months or more, Unrealized Losses | (135,000) | (879,000) | (135,000) | (879,000) | (634,000)
Total, Unrealized Losses | (254,000) | (1,065,000) | (254,000) | (1,065,000) | (796,000)
Number Of States in New England Where FHLB Serve | 6 |  | 6 |  |
Federal Home Loan Bank stock, at cost | 13,412,000 | 14,031,000 | 13,412,000 | 14,031,000 | 14,031,000
Balance at beginning of year | 7,526,000 | 2,198,000 | 7,401,000 | (2,057,000) | (2,057,000)
Unrealized gains (losses) arising during the period | 3,019,000 | 9,174,000 | 5,178,000 | 15,949,000 |
Realized (gains) losses during the period | 0 | (8,000) | (1,967,000) | (237,000) |
Related deferred taxes | (1,057,000) | (3,209,000) | (1,124,000) | (5,500,000) |
Net change | 1,962,000 | 5,957,000 | 2,087,000 | 10,212,000 |
Balance at end of year | 9,488,000 | 8,155,000 | 9,488,000 | 8,155,000 | 7,401,000
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 154,256,000 | 129,699,000 | 154,256,000 | 129,699,000 | 122,661,000
Unrealized Gains | 8,157,000 | 7,798,000 | 8,157,000 | 7,798,000 | 8,191,000
Unrealized Losses | (31,000) | (270,000) | (31,000) | (270,000) | (175,000)
Fair Value Estimated | 162,382,000 | 137,227,000 | 162,382,000 | 137,227,000 | 130,677,000
Restricted equity securities, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 14,448,000 | 15,443,000 | 14,448,000 | 15,443,000 | 15,443,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 14,448,000 | 15,443,000 | 14,448,000 | 15,443,000 | 15,443,000
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Amortized cost, debt maturities, due in 1 year or less | 4,592,000 | 4,394,000 | 4,592,000 | 4,394,000 | 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years | 50,173,000 | 11,188,000 | 50,173,000 | 11,188,000 | 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years | 16,908,000 | 34,872,000 | 16,908,000 | 34,872,000 | 23,219,000
Amortized cost, debt maturities, due after 10 years | 212,067,000 | 263,248,000 | 212,067,000 | 263,248,000 | 224,653,000
Amortized cost, equity maturities | 1,563,000 | 534,000 | 1,563,000 | 534,000 | 1,535,000
Total amortized cost, available for sale securities | 285,303,000 | 314,236,000 | 285,303,000 | 314,236,000 | 274,816,000
Fair value, debt maturities, due in 1 year or less | 4,652,000 | 4,450,000 | 4,652,000 | 4,450,000 | 6,773,000
Fair value, debt maturities, due in 1 to 5 years | 51,286,000 | 11,748,000 | 51,286,000 | 11,748,000 | 19,473,000
Fair value, debt maturities, due in 5 to 10 years | 17,965,000 | 36,698,000 | 17,965,000 | 36,698,000 | 24,065,000
Fair value, debt maturities, due after 10 years | 224,489,000 | 273,454,000 | 224,489,000 | 273,454,000 | 234,458,000
Fair value, equity maturities | 1,508,000 | 432,000 | 1,508,000 | 432,000 | 1,433,000
Fair Value Estimated | 299,900,000 | 326,782,000 | 299,900,000 | 326,782,000 | 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Amortized cost, due in 1 year or less | 1,376,000 | 152,000 | 1,376,000 | 152,000 | 5,179,000
Amortized cost, due in 1 to 5 years | 11,046,000 | 14,848,000 | 11,046,000 | 14,848,000 | 10,085,000
Amortized cost, due in 5 to 10 years | 20,519,000 | 22,158,000 | 20,519,000 | 22,158,000 | 23,027,000
Amortized cost, due after 10 years | 121,315,000 | 92,541,000 | 121,315,000 | 92,541,000 | 84,370,000
Total amortized cost, held to maturity securities | 154,256,000 | 129,699,000 | 154,256,000 | 129,699,000 | 122,661,000
Fair value, due in 1 year or less | 1,380,000 | 153,000 | 1,380,000 | 153,000 | 5,227,000
Fair value, due in 1 to 5 years | 11,569,000 | 15,415,000 | 11,569,000 | 15,415,000 | 10,654,000
Fair value, due in 5 to 10 years | 22,376,000 | 23,608,000 | 22,376,000 | 23,608,000 | 24,694,000
Fair value, due after 10 years | 127,057,000 | 98,051,000 | 127,057,000 | 98,051,000 | 90,102,000
Fair Value Estimated | 162,382,000 | 137,227,000 | 162,382,000 | 137,227,000 | 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 | 171,004,000 | 171,436,000 | 171,004,000 | 171,436,000 | 141,506,000
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) | 20 | 29 | 20 | 29 | 29
Number of securities temporarily impaired for 12 months or more (in number of securities) | 7 | 12 | 7 | 12 | 11
Length of time for the temporary impairment (in months) |  |  | 12M | 12M | 12M
Federal Home Loan Bank Stock [Member] |  |  |  |  |
Restricted equity securities, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 13,412,000 | 14,031,000 | 13,412,000 | 14,031,000 | 14,031,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 13,412,000 | 14,031,000 | 13,412,000 | 14,031,000 | 14,031,000
Federal Reserve Bank Stock [Member] |  |  |  |  |
Restricted equity securities, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 1,036,000 | 1,412,000 | 1,036,000 | 1,412,000 | 1,412,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 1,036,000 | 1,412,000 | 1,036,000 | 1,412,000 | 1,412,000
US Treasury and Government [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 65,859,000 | 20,998,000 | 65,859,000 | 20,998,000 | 19,390,000
Unrealized Gains | 390,000 | 180,000 | 390,000 | 180,000 | 132,000
Unrealized Losses | (21,000) | 0 | (21,000) | 0 | 0
Fair Value Estimated | 66,228,000 | 21,178,000 | 66,228,000 | 21,178,000 | 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 65,859,000 | 20,998,000 | 65,859,000 | 20,998,000 | 19,390,000
Fair Value Estimated | 66,228,000 | 21,178,000 | 66,228,000 | 21,178,000 | 19,522,000
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 44,236,000 | 61,048,000 | 44,236,000 | 61,048,000 | 56,800,000
Unrealized Gains | 3,400,000 | 4,221,000 | 3,400,000 | 4,221,000 | 3,900,000
Unrealized Losses | (10,000) | (19,000) | (10,000) | (19,000) | (3,000)
Fair Value Estimated | 47,626,000 | 65,250,000 | 47,626,000 | 65,250,000 | 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 44,236,000 | 61,048,000 | 44,236,000 | 61,048,000 | 56,800,000
Fair Value Estimated | 47,626,000 | 65,250,000 | 47,626,000 | 65,250,000 | 60,697,000
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 43,861,000 | 47,353,000 | 43,861,000 | 47,353,000 | 46,171,000
Unrealized Gains | 4,367,000 | 3,397,000 | 4,367,000 | 3,397,000 | 4,159,000
Unrealized Losses | 0 | (251,000) | 0 | (251,000) | (172,000)
Fair Value Estimated | 48,228,000 | 50,499,000 | 48,228,000 | 50,499,000 | 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 43,861,000 | 47,353,000 | 43,861,000 | 47,353,000 | 46,171,000
Fair Value Estimated | 48,228,000 | 50,499,000 | 48,228,000 | 50,499,000 | 50,158,000
Corporate Debt Securities [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 300,000 | 300,000 | 300,000 | 300,000 | 300,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 300,000 | 300,000 | 300,000 | 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 | 300,000 | 300,000 | 300,000
Fair Value Estimated | 300,000 | 300,000 | 300,000 | 300,000 | 300,000
US Treasury and Government [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 0 | 15,295,000 | 0 | 15,295,000 | 0
Unrealized Gains | 0 | 1,199,000 | 0 | 1,199,000 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 0 | 16,494,000 | 0 | 16,494,000 | 0
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 1,199,000 | 0 | 1,199,000 | 0 | 0
12 months or more, Fair Value | 0 | 0 | 0 | 0 | 0
Total, Fair Value | 1,199,000 | 0 | 1,199,000 | 0 | 0
Less than 12 months, Unrealized Losses | (21,000) | 0 | (21,000) | 0 | 0
12 months or more, Unrealized Losses | 0 | 0 | 0 | 0 | 0
Total, Unrealized Losses | (21,000) | 0 | (21,000) | 0 | 0
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 0 | 16,494,000 | 0 | 16,494,000 | 0
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 183,126,000 | 227,180,000 | 183,126,000 | 227,180,000 | 191,924,000
Unrealized Gains | 6,408,000 | 8,173,000 | 6,408,000 | 8,173,000 | 6,486,000
Unrealized Losses | (97,000) | (315,000) | (97,000) | (315,000) | (178,000)
Fair Value Estimated | 189,437,000 | 235,038,000 | 189,437,000 | 235,038,000 | 198,232,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 12,990,000 | 11,669,000 | 12,990,000 | 11,669,000 | 12,489,000
12 months or more, Fair Value | 3,104,000 | 6,984,000 | 3,104,000 | 6,984,000 | 6,780,000
Total, Fair Value | 16,094,000 | 18,653,000 | 16,094,000 | 18,653,000 | 19,269,000
Less than 12 months, Unrealized Losses | (76,000) | (46,000) | (76,000) | (46,000) | (25,000)
12 months or more, Unrealized Losses | (31,000) | (288,000) | (31,000) | (288,000) | (156,000)
Total, Unrealized Losses | (107,000) | (334,000) | (107,000) | (334,000) | (181,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 189,437,000 | 235,038,000 | 189,437,000 | 235,038,000 | 198,232,000
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 100,614,000 | 70,124,000 | 100,614,000 | 70,124,000 | 80,259,000
Unrealized Gains | 8,363,000 | 3,936,000 | 8,363,000 | 3,936,000 | 5,484,000
Unrealized Losses | (22,000) | (21,000) | (22,000) | (21,000) | (17,000)
Fair Value Estimated | 108,955,000 | 74,039,000 | 108,955,000 | 74,039,000 | 85,726,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 1,123,000 | 1,748,000 | 1,123,000 | 1,748,000 | 1,984,000
12 months or more, Fair Value | 0 | 1,569,000 | 0 | 1,569,000 | 1,667,000
Total, Fair Value | 1,123,000 | 3,317,000 | 1,123,000 | 3,317,000 | 3,651,000
Less than 12 months, Unrealized Losses | (22,000) | (21,000) | (22,000) | (21,000) | (17,000)
12 months or more, Unrealized Losses | 0 | (251,000) | 0 | (251,000) | (172,000)
Total, Unrealized Losses | (22,000) | (272,000) | (22,000) | (272,000) | (189,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 108,955,000 | 74,039,000 | 108,955,000 | 74,039,000 | 85,726,000
Corporate Debt Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 0 | 1,103,000 | 0 | 1,103,000 | 1,098,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | (324,000) | 0 | (324,000) | (287,000)
Fair Value Estimated | 0 | 779,000 | 0 | 779,000 | 811,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 0 | 0 | 0 | 0 | 0
12 months or more, Fair Value | 0 | 779,000 | 0 | 779,000 | 811,000
Total, Fair Value | 0 | 779,000 | 0 | 779,000 | 811,000
Less than 12 months, Unrealized Losses | 0 | 0 | 0 | 0 | 0
12 months or more, Unrealized Losses | 0 | (324,000) | 0 | (324,000) | (287,000)
Total, Unrealized Losses | 0 | (324,000) | 0 | (324,000) | (287,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 0 | 779,000 | 0 | 779,000 | 811,000
Other Equity Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Equity | 1,563,000 | 534,000 | 1,563,000 | 534,000 | 1,535,000
Unrealized Gains | 49,000 | 33,000 | 49,000 | 33,000 | 37,000
Unrealized Losses | (104,000) | (135,000) | (104,000) | (135,000) | (139,000)
Fair Value Estimated | 1,508,000 | 432,000 | 1,508,000 | 432,000 | 1,433,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 3,000 | 151,000 | 3,000 | 151,000 | 154,000
12 months or more, Fair Value | 191,000 | 36,000 | 191,000 | 36,000 | 34,000
Total, Fair Value | 194,000 | 187,000 | 194,000 | 187,000 | 188,000
Less than 12 months, Unrealized Losses | 0 | (119,000) | 0 | (119,000) | (120,000)
12 months or more, Unrealized Losses | (104,000) | (16,000) | (104,000) | (16,000) | (19,000)
Total, Unrealized Losses | (104,000) | (135,000) | (104,000) | (135,000) | (139,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Amortized cost, equity maturities | 1,563,000 | 534,000 | 1,563,000 | 534,000 | 1,535,000
Fair Value Estimated | $ 1,508,000 | $ 432,000 | $ 1,508,000 | $ 432,000 | $ 1,433,000

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