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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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