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Investment Securities (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Securities available for sale |  |  |  |  |
Amortized Cost-Equity | $ 1,863,000 | $ 527,000 | $ 1,863,000 | $ 527,000 | $ 1,535,000
Amortized Cost-Total | 295,768,000 | 300,897,000 | 295,768,000 | 300,897,000 | 274,816,000
Unrealized Gains | 12,015,000 | 4,946,000 | 12,015,000 | 4,946,000 | 12,007,000
Unrealized Losses | (436,000) | (1,565,000) | (436,000) | (1,565,000) | (621,000)
Fair Value Estimated | 307,347,000 | 304,278,000 | 307,347,000 | 304,278,000 | 286,202,000
Proceeds from sales | 14,194,000 | 75,176,000 | 25,137,000 | 75,176,000 |
Gross gains | 1,444,000 | 957,000 | 2,256,000 | 957,000 |
Gross losses | 0 | (728,000) | (289,000) | (728,000) |
Net gain | 1,444,000 | 229,000 | 1,967,000 | 229,000 |
Related income taxes | 505,000 | 80,000 | 688,000 | 80,000 |
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 21,483,000 | 96,238,000 | 21,483,000 | 96,238,000 | 14,627,000
12 months or more, Fair Value | 5,328,000 | 6,154,000 | 5,328,000 | 6,154,000 | 9,292,000
Total, Fair Value | 26,811,000 | 102,392,000 | 26,811,000 | 102,392,000 | 23,919,000
Less than 12 months, Unrealized Losses | (194,000) | (1,387,000) | (194,000) | (1,387,000) | (162,000)
12 months or more, Unrealized Losses | (283,000) | (747,000) | (283,000) | (747,000) | (634,000)
Total, Unrealized Losses | (477,000) | (2,134,000) | (477,000) | (2,134,000) | (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 | 7,088,000 | (1,389,000) | 7,401,000 | (2,057,000) | (2,057,000)
Unrealized gains (losses) arising during the period | 2,118,000 | 5,747,000 | 2,159,000 | 6,775,000 |
Realized (gains) losses during the period | (1,444,000) | (229,000) | (1,967,000) | (229,000) |
Related deferred taxes | (236,000) | (1,931,000) | (67,000) | (2,291,000) |
Net change | 438,000 | 3,587,000 | 125,000 | 4,255,000 |
Balance at end of year | 7,526,000 | 2,198,000 | 7,526,000 | 2,198,000 | 7,401,000
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 135,775,000 | 122,970,000 | 135,775,000 | 122,970,000 | 122,661,000
Unrealized Gains | 7,894,000 | 6,025,000 | 7,894,000 | 6,025,000 | 8,191,000
Unrealized Losses | (41,000) | (569,000) | (41,000) | (569,000) | (175,000)
Fair Value Estimated | 143,628,000 | 128,426,000 | 143,628,000 | 128,426,000 | 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 | 4,296,000 | 5,032,000 | 4,296,000 | 5,032,000 | 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years | 55,317,000 | 7,623,000 | 55,317,000 | 7,623,000 | 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years | 23,143,000 | 25,845,000 | 23,143,000 | 25,845,000 | 23,219,000
Amortized cost, debt maturities, due after 10 years | 211,149,000 | 261,870,000 | 211,149,000 | 261,870,000 | 224,653,000
Amortized cost, equity maturities | 1,863,000 | 527,000 | 1,863,000 | 527,000 | 1,535,000
Total amortized cost, available for sale securities | 295,768,000 | 300,897,000 | 295,768,000 | 300,897,000 | 274,816,000
Fair value, debt maturities, due in 1 year or less | 4,328,000 | 4,941,000 | 4,328,000 | 4,941,000 | 6,773,000
Fair value, debt maturities, due in 1 to 5 years | 56,358,000 | 7,904,000 | 56,358,000 | 7,904,000 | 19,473,000
Fair value, debt maturities, due in 5 to 10 years | 24,034,000 | 26,099,000 | 24,034,000 | 26,099,000 | 24,065,000
Fair value, debt maturities, due after 10 years | 220,852,000 | 264,801,000 | 220,852,000 | 264,801,000 | 234,458,000
Fair value, equity maturities | 1,775,000 | 533,000 | 1,775,000 | 533,000 | 1,433,000
Fair Value Estimated | 307,347,000 | 304,278,000 | 307,347,000 | 304,278,000 | 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Amortized cost, due in 1 year or less | 1,382,000 | 227,000 | 1,382,000 | 227,000 | 5,179,000
Amortized cost, due in 1 to 5 years | 13,556,000 | 10,633,000 | 13,556,000 | 10,633,000 | 10,085,000
Amortized cost, due in 5 to 10 years | 21,137,000 | 23,562,000 | 21,137,000 | 23,562,000 | 23,027,000
Amortized cost, due after 10 years | 99,700,000 | 88,548,000 | 99,700,000 | 88,548,000 | 84,370,000
Total amortized cost, held to maturity securities | 135,775,000 | 122,970,000 | 135,775,000 | 122,970,000 | 122,661,000
Fair value, due in 1 year or less | 1,399,000 | 227,000 | 1,399,000 | 227,000 | 5,227,000
Fair value, due in 1 to 5 years | 14,134,000 | 11,147,000 | 14,134,000 | 11,147,000 | 10,654,000
Fair value, due in 5 to 10 years | 22,958,000 | 24,623,000 | 22,958,000 | 24,623,000 | 24,694,000
Fair value, due after 10 years | 105,137,000 | 92,429,000 | 105,137,000 | 92,429,000 | 90,102,000
Fair Value Estimated | 143,628,000 | 128,426,000 | 143,628,000 | 128,426,000 | 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 | 140,384,000 | 132,827,000 | 140,384,000 | 132,827,000 | 141,506,000
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) | 30 | 65 | 30 | 65 | 29
Number of securities temporarily impaired for 12 months or more (in number of securities) | 8 | 11 | 8 | 11 | 11
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 | 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 | 41,197,000 | 12,970,000 | 41,197,000 | 12,970,000 | 19,390,000
Unrealized Gains | 282,000 | 0 | 282,000 | 0 | 132,000
Unrealized Losses | (33,000) | (186,000) | (33,000) | (186,000) | 0
Fair Value Estimated | 41,446,000 | 12,784,000 | 41,446,000 | 12,784,000 | 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 41,197,000 | 12,970,000 | 41,197,000 | 12,970,000 | 19,390,000
Fair Value Estimated | 41,446,000 | 12,784,000 | 41,446,000 | 12,784,000 | 19,522,000
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 49,992,000 | 60,836,000 | 49,992,000 | 60,836,000 | 56,800,000
Unrealized Gains | 3,524,000 | 3,626,000 | 3,524,000 | 3,626,000 | 3,900,000
Unrealized Losses | (8,000) | (37,000) | (8,000) | (37,000) | (3,000)
Fair Value Estimated | 53,508,000 | 64,425,000 | 53,508,000 | 64,425,000 | 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 49,992,000 | 60,836,000 | 49,992,000 | 60,836,000 | 56,800,000
Fair Value Estimated | 53,508,000 | 64,425,000 | 53,508,000 | 64,425,000 | 60,697,000
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |  |  |
Amortized Cost | 44,286,000 | 48,864,000 | 44,286,000 | 48,864,000 | 46,171,000
Unrealized Gains | 4,088,000 | 2,399,000 | 4,088,000 | 2,399,000 | 4,159,000
Unrealized Losses | 0 | (346,000) | 0 | (346,000) | (172,000)
Fair Value Estimated | 48,374,000 | 50,917,000 | 48,374,000 | 50,917,000 | 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |  |  |
Total amortized cost, held to maturity securities | 44,286,000 | 48,864,000 | 44,286,000 | 48,864,000 | 46,171,000
Fair Value Estimated | 48,374,000 | 50,917,000 | 48,374,000 | 50,917,000 | 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 | 15,324,000 | 0 | 15,324,000 | 0
Unrealized Gains | 0 | 799,000 | 0 | 799,000 | 0
Unrealized Losses | 0 | 0 | 0 | 0 | 0
Fair Value Estimated | 0 | 16,123,000 | 0 | 16,123,000 | 0
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 7,942,000 | 12,784,000 | 7,942,000 | 12,784,000 | 0
12 months or more, Fair Value | 0 | 0 | 0 | 0 | 0
Total, Fair Value | 7,942,000 | 12,784,000 | 7,942,000 | 12,784,000 | 0
Less than 12 months, Unrealized Losses | (33,000) | (186,000) | (33,000) | (186,000) | 0
12 months or more, Unrealized Losses | 0 | 0 | 0 | 0 | 0
Total, Unrealized Losses | (33,000) | (186,000) | (33,000) | (186,000) | 0
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 0 | 16,123,000 | 0 | 16,123,000 | 0
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 201,552,000 | 220,245,000 | 201,552,000 | 220,245,000 | 191,924,000
Unrealized Gains | 5,677,000 | 2,548,000 | 5,677,000 | 2,548,000 | 6,486,000
Unrealized Losses | (250,000) | (1,269,000) | (250,000) | (1,269,000) | (178,000)
Fair Value Estimated | 206,979,000 | 221,524,000 | 206,979,000 | 221,524,000 | 198,232,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 9,822,000 | 71,157,000 | 9,822,000 | 71,157,000 | 12,489,000
12 months or more, Fair Value | 5,137,000 | 3,681,000 | 5,137,000 | 3,681,000 | 6,780,000
Total, Fair Value | 14,959,000 | 74,838,000 | 14,959,000 | 74,838,000 | 19,269,000
Less than 12 months, Unrealized Losses | (110,000) | (1,044,000) | (110,000) | (1,044,000) | (25,000)
12 months or more, Unrealized Losses | (148,000) | (262,000) | (148,000) | (262,000) | (156,000)
Total, Unrealized Losses | (258,000) | (1,306,000) | (258,000) | (1,306,000) | (181,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 206,979,000 | 221,524,000 | 206,979,000 | 221,524,000 | 198,232,000
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 92,353,000 | 63,696,000 | 92,353,000 | 63,696,000 | 80,259,000
Unrealized Gains | 6,291,000 | 1,573,000 | 6,291,000 | 1,573,000 | 5,484,000
Unrealized Losses | (51,000) | (107,000) | (51,000) | (107,000) | (17,000)
Fair Value Estimated | 98,593,000 | 65,162,000 | 98,593,000 | 65,162,000 | 85,726,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 3,719,000 | 12,050,000 | 3,719,000 | 12,050,000 | 1,984,000
12 months or more, Fair Value | 0 | 1,489,000 | 0 | 1,489,000 | 1,667,000
Total, Fair Value | 3,719,000 | 13,539,000 | 3,719,000 | 13,539,000 | 3,651,000
Less than 12 months, Unrealized Losses | (51,000) | (142,000) | (51,000) | (142,000) | (17,000)
12 months or more, Unrealized Losses | 0 | (311,000) | 0 | (311,000) | (172,000)
Total, Unrealized Losses | (51,000) | (453,000) | (51,000) | (453,000) | (189,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 98,593,000 | 65,162,000 | 98,593,000 | 65,162,000 | 85,726,000
Corporate Debt Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Debt | 0 | 1,105,000 | 0 | 1,105,000 | 1,098,000
Unrealized Gains | 0 | 0 | 0 | 0 | 0
Unrealized Losses | 0 | (169,000) | 0 | (169,000) | (287,000)
Fair Value Estimated | 0 | 936,000 | 0 | 936,000 | 811,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 0 | 0 | 0 | 0 | 0
12 months or more, Fair Value | 0 | 936,000 | 0 | 936,000 | 811,000
Total, Fair Value | 0 | 936,000 | 0 | 936,000 | 811,000
Less than 12 months, Unrealized Losses | 0 | 0 | 0 | 0 | 0
12 months or more, Unrealized Losses | 0 | (169,000) | 0 | (169,000) | (287,000)
Total, Unrealized Losses | 0 | (169,000) | 0 | (169,000) | (287,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Fair Value Estimated | 0 | 936,000 | 0 | 936,000 | 811,000
Other Equity Securities [Member] |  |  |  |  |
Securities available for sale |  |  |  |  |
Amortized Cost-Equity | 1,863,000 | 527,000 | 1,863,000 | 527,000 | 1,535,000
Unrealized Gains | 47,000 | 26,000 | 47,000 | 26,000 | 37,000
Unrealized Losses | (135,000) | (20,000) | (135,000) | (20,000) | (139,000)
Fair Value Estimated | 1,775,000 | 533,000 | 1,775,000 | 533,000 | 1,433,000
Temporarily Impaired Securities [Abstract] |  |  |  |  |
Less than 12 months, Fair Value | 0 | 247,000 | 0 | 247,000 | 154,000
12 months or more, Fair Value | 191,000 | 48,000 | 191,000 | 48,000 | 34,000
Total, Fair Value | 191,000 | 295,000 | 191,000 | 295,000 | 188,000
Less than 12 months, Unrealized Losses | 0 | (15,000) | 0 | (15,000) | (120,000)
12 months or more, Unrealized Losses | (135,000) | (5,000) | (135,000) | (5,000) | (19,000)
Total, Unrealized Losses | (135,000) | (20,000) | (135,000) | (20,000) | (139,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |  |  |
Amortized cost, equity maturities | 1,863,000 | 527,000 | 1,863,000 | 527,000 | 1,535,000
Fair Value Estimated | $ 1,775,000 | $ 533,000 | $ 1,775,000 | $ 533,000 | $ 1,433,000

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