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Investment Securities (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Securities available for sale |  |  |
Amortized Cost-Equity | $ 1,863,000 | $ 385,000 | $ 1,535,000
Amortized Cost-Total | 306,206,000 | 327,588,000 | 274,816,000
Unrealized Gains | 11,389,000 | 2,324,000 | 12,007,000
Unrealized Losses | (484,000) | (4,461,000) | (621,000)
Fair Value Estimated | 317,111,000 | 325,451,000 | 286,202,000
Proceeds from sales | 10,943,000 |  |
Gross gains | 812,000 |  |
Gross losses | 289,000 |  |
Net gain | 523,000 | 0 |
Related income taxes | 183,000 |  |
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 73,680,000 | 219,768,000 | 14,627,000
12 months or more, Fair Value | 6,861,000 | 9,124,000 | 9,292,000
Total, Fair Value | 80,541,000 | 228,892,000 | 23,919,000
Less than 12 months, Unrealized Losses | (919,000) | (4,424,000) | (162,000)
12 months or more, Unrealized Losses | (154,000) | (911,000) | (634,000)
Total, Unrealized Losses | (1,073,000) | 5,335,000 | (796,000)
Number Of States in New England Where FHLB Serve | 6 |  |
Balance at beginning of year | 7,401,000 |  |
Balance at end of year | 7,088,000 | (1,389,000) | 7,401,000
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 137,606,000 | 109,936,000 | 122,661,000
Unrealized Gains | 7,616,000 | 4,989,000 | 8,191,000
Unrealized Losses | (589,000) | (874,000) | (175,000)
Fair Value Estimated | 144,633,000 | 114,051,000 | 130,677,000
Non-marketable securities, cost and FMV [Abstract] |  |  |
Unrealized Gains |  | 0 |
Unrealized Losses |  | 0 |
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Amortized cost, debt maturities, due in 1 year or less | 5,894,000 | 212,000 | 6,617,000
Amortized cost, debt maturities, due in 1 to 5 years | 59,887,000 | 2,818,000 | 18,792,000
Amortized cost, debt maturities, due in 5 to 10 years | 13,014,000 | 4,774,000 | 23,219,000
Amortized cost, debt maturities, due after 10 years | 225,548,000 | 319,399,000 | 224,653,000
Amortized cost, equity maturities | 1,863,000 | 385,000 | 1,535,000
Total amortized cost, available for sale securities | 306,206,000 | 327,588,000 | 274,816,000
Fair value, debt maturities, due in 1 year or less | 5,948,000 | 218,000 | 6,773,000
Fair value, debt maturities, due in 1 to 5 years | 60,971,000 | 2,964,000 | 19,473,000
Fair value, debt maturities, due in 5 to 10 years | 13,442,000 | 4,916,000 | 24,065,000
Fair value, debt maturities, due after 10 years | 234,916,000 | 316,959,000 | 234,458,000
Fair value, equity maturities | 1,834,000 | 394,000 | 1,433,000
Fair Value Estimated | 317,111,000 | 325,451,000 | 286,202,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Amortized cost, due in 1 year or less | 4,663,000 | 1,072,000 | 5,179,000
Amortized cost, due in 1 to 5 years | 12,173,000 | 5,629,000 | 10,085,000
Amortized cost, due in 5 to 10 years | 35,563,000 | 16,974,000 | 23,027,000
Amortized cost, due after 10 years | 85,207,000 | 86,261,000 | 84,370,000
Total amortized cost, held to maturity securities | 137,606,000 | 109,936,000 | 122,661,000
Fair value, due in 1 year or less | 4,710,000 | 1,084,000 | 5,227,000
Fair value, due in 1 to 5 years | 12,940,000 | 5,948,000 | 10,654,000
Fair value, due in 5 to 10 years | 38,100,000 | 17,737,000 | 24,694,000
Fair value, due after 10 years | 88,883,000 | 89,282,000 | 90,102,000
Fair Value Estimated | 144,633,000 | 114,051,000 | 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 | 136,156,000 | 121,143,000 | 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 | 104 | 29
Number of securities temporarily impaired for 12 months or more (in number of securities) | 8 | 12 | 11
Length of time for the temporary impairment (in months) | 12M | 12M | 12M
Federal Home Loan Bank Stock [Member] |  |  |
Non-marketable securities, cost and FMV [Abstract] |  |  |
Amortized Cost | 13,412,000 | 14,032,000 | 14,032,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value Estimated | 13,412,000 | 14,032,000 | 14,032,000
Federal Reserve Bank Stock [Member] |  |  |
Non-marketable securities, cost and FMV [Abstract] |  |  |
Amortized Cost | 1,411,000 | 1,411,000 | 1,411,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value Estimated | 1,411,000 | 1,411,000 | 1,411,000
US Treasury and Government [Member] |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 39,694,000 | 2,936,000 | 19,390,000
Unrealized Gains | 37,000 | 0 | 132,000
Unrealized Losses | (435,000) | (292,000) | 0
Fair Value Estimated | 39,296,000 | 2,644,000 | 19,522,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Total amortized cost, held to maturity securities | 39,694,000 | 2,936,000 | 19,390,000
Fair Value Estimated | 39,296,000 | 2,644,000 | 19,522,000
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 52,185,000 | 59,063,000 | 56,800,000
Unrealized Gains | 3,638,000 | 3,348,000 | 3,900,000
Unrealized Losses | 0 | (76,000) | (3,000)
Fair Value Estimated | 55,823,000 | 62,335,000 | 60,697,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Total amortized cost, held to maturity securities | 52,185,000 | 59,063,000 | 56,800,000
Fair Value Estimated | 55,823,000 | 62,335,000 | 60,697,000
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 45,427,000 | 47,787,000 | 46,171,000
Unrealized Gains | 3,941,000 | 1,641,000 | 4,159,000
Unrealized Losses | 154,000 | (506,000) | (172,000)
Fair Value Estimated | 49,214,000 | 48,922,000 | 50,158,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Total amortized cost, held to maturity securities | 45,427,000 | 47,787,000 | 46,171,000
Fair Value Estimated | 49,214,000 | 48,922,000 | 50,158,000
Corporate Debt Securities [Member] |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 300,000 | 150,000 | 300,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value Estimated | 300,000 | 150,000 | 300,000
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Total amortized cost, held to maturity securities | 300,000 | 150,000 | 300,000
Fair Value Estimated | 300,000 | 150,000 | 300,000
US Treasury and Government [Member] |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 0 | 15,352,000 | 0
Unrealized Gains | 0 | 591,000 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value Estimated | 0 | 15,943,000 | 0
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 33,514,000 | 2,645,000 | 0
12 months or more, Fair Value | 0 | 0 | 0
Total, Fair Value | 33,514,000 | 2,645,000 | 0
Less than 12 months, Unrealized Losses | (435,000) | (292,000) | 0
12 months or more, Unrealized Losses | 0 | 0 | 0
Total, Unrealized Losses | (435,000) | (292,000) | 0
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 0 | 15,943,000 | 0
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 226,671,000 | 255,703,000 | 191,924,000
Unrealized Gains | 5,805,000 | 1,138,000 | 6,486,000
Unrealized Losses | (361,000) | (3,731,000) | (178,000)
Fair Value Estimated | 232,115,000 | 253,110,000 | 198,232,000
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 35,242,000 | 187,278,000 | 12,489,000
12 months or more, Fair Value | 6,608,000 | 6,757,000 | 6,780,000
Total, Fair Value | 41,850,000 | 194,035,000 | 19,269,000
Less than 12 months, Unrealized Losses | (280,000) | (3,471,000) | (25,000)
12 months or more, Unrealized Losses | (81,000) | (336,000) | (156,000)
Total, Unrealized Losses | (361,000) | (3,807,000) | (181,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 232,115,000 | 253,110,000 | 198,232,000
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 77,672,000 | 55,040,000 | 80,259,000
Unrealized Gains | 5,540,000 | 577,000 | 5,484,000
Unrealized Losses | (50,000) | (536,000) | (17,000)
Fair Value Estimated | 83,162,000 | 55,081,000 | 85,726,000
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 4,924,000 | 29,835,000 | 1,984,000
12 months or more, Fair Value | 0 | 1,398,000 | 1,667,000
Total, Fair Value | 4,924,000 | 31,233,000 | 3,651,000
Less than 12 months, Unrealized Losses | (204,000) | (659,000) | (17,000)
12 months or more, Unrealized Losses | 0 | (383,000) | (172,000)
Total, Unrealized Losses | (204,000) | (1,042,000) | (189,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 83,162,000 | 55,081,000 | 85,726,000
Corporate Debt Securities [Member] |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 0 | 1,108,000 | 1,098,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | (185,000) | (287,000)
Fair Value Estimated | 0 | 923,000 | 811,000
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 0 | 0 | 0
12 months or more, Fair Value | 0 | 922,000 | 811,000
Total, Fair Value | 0 | 922,000 | 811,000
Less than 12 months, Unrealized Losses | 0 | 0 | 0
12 months or more, Unrealized Losses | 0 | (185,000) | 287,000
Total, Unrealized Losses | 0 | (185,000) | (287,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 0 | 923,000 | 811,000
Other Equity Securities [Member] |  |  |
Securities available for sale |  |  |
Amortized Cost-Equity | 1,863,000 | 385,000 | 1,535,000
Unrealized Gains | 44,000 | 18,000 | 37,000
Unrealized Losses | (73,000) | (9,000) | (139,000)
Fair Value Estimated | 1,834,000 | 394,000 | 1,433,000
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 0 | 10,000 | 154,000
12 months or more, Fair Value | 253,000 | 47,000 | 34,000
Total, Fair Value | 253,000 | 57,000 | 188,000
Less than 12 months, Unrealized Losses | 0 | (2,000) | (120,000)
12 months or more, Unrealized Losses | (73,000) | (7,000) | (19,000)
Total, Unrealized Losses | (73,000) | (9,000) | (139,000)
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Amortized cost, equity maturities | 1,863,000 | 385,000 | 1,535,000
Fair Value Estimated | $ 1,834,000 | $ 394,000 | $ 1,433,000

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