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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 state security | Dec. 31, 2012 | Dec. 31, 2011
Securities available for sale |  |  |
Amortized Cost-Equity | $ 1,666 | $ 1,578 |
Amortized Cost-Total | 315,963 | 279,399 |
Unrealized Gains | 2,966 | 12,753 |
Unrealized Losses | (13,105) | (538) |
Fair Value Estimated | 305,824 | 291,614 |
Proceeds from sales of securities | 10,563 | 26,437 | 140,417
Gross realized gains | 1,087 | 2,257 | 4,020
Gross realized losses | 0 | (289) | (727)
Net gain | 1,087 | 1,968 | 3,293
Related income taxes | 380 | 689 | 1,153
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 244,393 | 34,420 |
12 months or more, Fair Value | 12,651 | 2,756 |
Total, Fair Value | 257,044 | 37,176 |
Less than 12 months, Unrealized Losses | (25,629) | (612) |
12 months or more, Unrealized Losses | (1,681) | (127) |
Total, Unrealized Losses | (27,310) | (739) |
Number Of States in New England Where FHLB Serve | 6 |  |
Federal Home Loan Bank stock, at cost | 12,875 | 13,412 |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 169,277 | 143,320 |
Unrealized Gains | 3,264 | 7,128 |
Unrealized Losses | (14,205) | (201) |
Securities to be held to maturity, fair value | 158,336 | 150,247 |
Restricted equity securities, cost and FMV [Abstract] |  |  |
Amortized Cost | 13,912 | 14,448 |
Unrealized Gains | 0 | 0 |
Unrealized Losses | 0 | 0 |
Fair Value Estimated | 13,912 | 14,448 |
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Amortized cost, debt maturities, due in 1 year or less | 717 | 18,761 |
Amortized cost, debt maturities, due in 1 to 5 years | 20,547 | 27,243 |
Amortized cost, debt maturities, due in 5 to 10 years | 16,114 | 16,686 |
Amortized cost, debt maturities, due after 10 years | 276,919 | 215,131 |
Amortized cost, equity maturities | 1,666 | 1,578 |
Amortized Cost-Total | 315,963 | 279,399 |
Fair value, debt maturities, due in 1 year or less | 721 | 18,926 |
Fair value, debt maturities, due in 1 to 5 years | 20,636 | 27,816 |
Fair value, debt maturities, due in 5 to 10 years | 16,267 | 17,666 |
Fair value, debt maturities, due after 10 years | 266,420 | 225,629 |
Fair value, equity maturities | 1,780 | 1,577 |
Fair Value Estimated | 305,824 | 291,614 |
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Amortized cost, due in 1 year or less | 268 | 3,754 |
Amortized cost, due in 1 to 5 years | 6,420 | 11,950 |
Amortized cost, due in 5 to 10 years | 33,442 | 27,461 |
Amortized cost, due after 10 years | 129,147 | 100,155 |
Securities to be held to maturity (fair value of $158,336,000 at December 31, 2013, and $150,247,000 at December 31, 2012) | 169,277 | 143,320 |
Fair value, due in 1 year or less | 273 | 3,785 |
Fair value, due in 1 to 5 years | 6,790 | 12,701 |
Fair value, due in 5 to 10 years | 33,828 | 29,986 |
Fair value, due after 10 years | 117,445 | 103,775 |
Securities to be held to maturity, fair value | 158,336 | 150,247 |
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 | 147,074 | 154,817 |
Number of securities temporarily impaired as a result of changes in interest rates reducing their fair value (in number of securities) | 304 |  |
Number of securities temporarily impaired for 12 months or more (in number of securities) | 32 |  |
Length of time for the temporary impairment (in months) | 12 months |  |
Federal Home Loan Bank Stock |  |  |
Restricted equity securities, cost and FMV [Abstract] |  |  |
Amortized Cost | 12,875 | 13,412 |
Unrealized Gains | 0 | 0 |
Unrealized Losses | 0 | 0 |
Fair Value Estimated | 12,875 | 13,412 |
Federal Reserve Bank Stock |  |  |
Restricted equity securities, cost and FMV [Abstract] |  |  |
Amortized Cost | 1,037 | 1,036 |
Unrealized Gains | 0 | 0 |
Unrealized Losses | 0 | 0 |
Fair Value Estimated | 1,037 | 1,036 |
US Treasury and Government |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 92,280 | 60,919 |
Unrealized Gains | 1 | 242 |
Unrealized Losses | (12,757) | (182) |
Securities to be held to maturity, fair value | 79,524 | 60,979 |
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Securities to be held to maturity (fair value of $158,336,000 at December 31, 2013, and $150,247,000 at December 31, 2012) | 92,280 | 60,919 |
Securities to be held to maturity, fair value | 79,524 | 60,979 |
Collateralized Mortgage Backed Securities |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 35,712 | 39,193 |
Unrealized Gains | 1,440 | 2,850 |
Unrealized Losses | (1,336) | (19) |
Securities to be held to maturity, fair value | 35,816 | 42,024 |
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Securities to be held to maturity (fair value of $158,336,000 at December 31, 2013, and $150,247,000 at December 31, 2012) | 35,712 | 39,193 |
Securities to be held to maturity, fair value | 35,816 | 42,024 |
US States and Political Subdivisions Debt Securities |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 40,985 | 42,908 |
Unrealized Gains | 1,823 | 4,036 |
Unrealized Losses | (112) | 0 |
Securities to be held to maturity, fair value | 42,696 | 46,944 |
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Securities to be held to maturity (fair value of $158,336,000 at December 31, 2013, and $150,247,000 at December 31, 2012) | 40,985 | 42,908 |
Securities to be held to maturity, fair value | 42,696 | 46,944 |
Corporate Debt Securities |  |  |
Securities to be held to maturity, cost and FMV [Abstract] |  |  |
Amortized Cost | 300 | 300 |
Unrealized Gains | 0 | 0 |
Unrealized Losses | 0 | 0 |
Securities to be held to maturity, fair value | 300 | 300 |
Securities to be held to maturity, maturities, amortized cost [Abstract] |  |  |
Securities to be held to maturity (fair value of $158,336,000 at December 31, 2013, and $150,247,000 at December 31, 2012) | 300 | 300 |
Securities to be held to maturity, fair value | 300 | 300 |
US Treasury and Government |  |  |
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 78,724 | 15,817 |
12 months or more, Fair Value | 0 | 0 |
Total, Fair Value | 78,724 | 15,817 |
Less than 12 months, Unrealized Losses | (12,757) | (182) |
12 months or more, Unrealized Losses | 0 | 0 |
Total, Unrealized Losses | (12,757) | (182) |
Collateralized Mortgage Backed Securities |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 180,109 | 164,752 |
Unrealized Gains | 1,392 | 4,636 |
Unrealized Losses | (3,772) | (295) |
Fair Value Estimated | 177,729 | 169,093 |
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 96,263 | 9,982 |
12 months or more, Fair Value | 5,451 | 2,534 |
Total, Fair Value | 101,714 | 12,516 |
Less than 12 months, Unrealized Losses | (4,977) | (231) |
12 months or more, Unrealized Losses | (131) | (83) |
Total, Unrealized Losses | (5,108) | (314) |
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 177,729 | 169,093 |
US States and Political Subdivisions Debt Securities |  |  |
Securities available for sale |  |  |
Amortized Cost-Debt | 134,188 | 113,069 |
Unrealized Gains | 1,458 | 8,074 |
Unrealized Losses | (9,331) | (199) |
Fair Value Estimated | 126,315 | 120,944 |
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 69,406 | 8,621 |
12 months or more, Fair Value | 7,150 | 0 |
Total, Fair Value | 76,556 | 8,621 |
Less than 12 months, Unrealized Losses | (7,895) | (199) |
12 months or more, Unrealized Losses | (1,548) | 0 |
Total, Unrealized Losses | (9,443) | (199) |
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Fair Value Estimated | 126,315 | 120,944 |
Other Equity Securities |  |  |
Securities available for sale |  |  |
Amortized Cost-Equity | 1,666 | 1,578 |
Unrealized Gains | 116 | 43 |
Unrealized Losses | (2) | (44) |
Fair Value Estimated | 1,780 | 1,577 |
Temporarily Impaired Securities [Abstract] |  |  |
Less than 12 months, Fair Value | 0 | 0 |
12 months or more, Fair Value | 50 | 222 |
Total, Fair Value | 50 | 222 |
Less than 12 months, Unrealized Losses | 0 | 0 |
12 months or more, Unrealized Losses | (2) | (44) |
Total, Unrealized Losses | (2) | (44) |
Securities available for sale, maturities amortized cost [Abstract] |  |  |
Amortized cost, equity maturities | 1,666 | 1,578 |
Fair Value Estimated | $ 1,780 | $ 1,577 |

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