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Loans (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio $ 870,892,000 $ 894,684,000 $ 864,988,000
Percentage of loan portfolio (in hundredths) 100.00% 100.00% 100.00%
Net deferred loan costs included in loan balances 1,520,000 1,366,000 1,386,000
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston 229,448,000 201,069,000 211,597,000
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston 227,022,000 346,424,000 218,417,000
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 8,227,000 8,070,000 8,619,000
90 Plus Days Past Due 18,347,000 18,743,000 17,978,000
All Past Due 26,574,000 26,813,000 26,597,000
Current 844,318,000 867,871,000 838,391,000
Total 870,892,000 894,684,000 864,988,000
90 Plus Days And Accruing 1,955,000 291,000  
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 24,438,000 22,498,000 27,806,000
Recorded Investment 26,701,000 18,191,000 27,897,000
Unpaid Principal, Impaired Loans 26,701,000 18,191,000 27,897,000
Allowance for loan losses 0 0 0
Average Recorded Investment 25,916,000 17,599,000 19,341,000
Recognized Interest Income 91,000 63,000 248,000
Balance of impaired loans 26,701,000 18,191,000 27,897,000
Allowance for loan losses 0 0 0
Commercial Real Estate [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 254,708,000 263,800,000 255,424,000
Percentage of loan portfolio (in hundredths) 2.93% 29.50% 29.50%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 623,000 682,000 2,872,000
90 Plus Days Past Due 4,526,000 6,431,000 3,992,000
All Past Due 5,149,000 7,113,000 6,864,000
Current 249,559,000 256,687,000 248,560,000
Total 254,708,000 263,800,000 255,424,000
90 Plus Days And Accruing 1,025,000 270,000 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 7,160,000 7,482,000 7,064,000
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 10,704,000 5,354,000 5,584,000
Unpaid Principal, Impaired Loans 10,704,000 5,354,000 5,584,000
Allowance for loan losses 0 0 0
Average Recorded Investment 8,445,000 4,557,000 5,212,000
Recognized Interest Income 40,000 6,000 23,000
Balance of impaired loans 10,704,000 5,354,000 5,584,000
Allowance for loan losses 0 0 0
Commercial Real Estate [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 3,591,000 2,128,000 4,557,000
Unpaid Principal, Impaired Loans 3,591,000 2,128,000 4,557,000
Allowance for loan losses 944,000 593,000 808,000
Average Recorded Investment 4,278,000 2,260,000 2,307,000
Recognized Interest Income 10,000 26,000 103,000
Balance of impaired loans 3,591,000 2,128,000 4,557,000
Allowance for loan losses 944,000 593,000 808,000
Commercial Construction [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 30,828,000 29,316,000 32,574,000
Percentage of loan portfolio (in hundredths) 3.50% 3.30% 3.80%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 1,951,000 65,000 174,000
90 Plus Days Past Due 35,000 256,000 1,603,000
All Past Due 1,986,000 321,000 1,777,000
Current 28,842,000 28,995,000 30,797,000
Total 30,828,000 29,316,000 32,574,000
90 Plus Days And Accruing 0 0 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 946,000 813,000 2,350,000
Commercial Construction [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 1,362,000 813,000 5,172,000
Unpaid Principal, Impaired Loans 1,362,000 813,000 5,172,000
Allowance for loan losses 0 0 0
Average Recorded Investment 2,983,000 442,000 1,071,000
Recognized Interest Income 13,000 36,000 143,000
Balance of impaired loans 1,362,000 813,000 5,172,000
Allowance for loan losses 0 0 0
Commercial Construction [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 731,000 0 530,000
Unpaid Principal, Impaired Loans 731,000 0 530,000
Allowance for loan losses 117,000 0 33,000
Average Recorded Investment 597,000 453,000 247,000
Recognized Interest Income 0 0 0
Balance of impaired loans 731,000 0 530,000
Allowance for loan losses 117,000 0 33,000
Commercial Other [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 85,467,000 101,762,000 86,982,000
Percentage of loan portfolio (in hundredths) 9.80% 11.40% 10.10%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 1,578,000 858,000 1,431,000
90 Plus Days Past Due 1,869,000 563,000 1,192,000
All Past Due 3,447,000 1,421,000 2,623,000
Current 82,020,000 100,341,000 84,359,000
Total 85,467,000 101,762,000 86,982,000
90 Plus Days And Accruing 563,000 2,000 52,000
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 2,634,000 1,615,000 5,784,000
Commercial Other [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 2,811,000 1,033,000 6,022,000
Unpaid Principal, Impaired Loans 2,811,000 1,033,000 6,022,000
Allowance for loan losses 0 0 0
Average Recorded Investment 2,981,000 1,173,000 1,919,000
Recognized Interest Income 8,000 7,000 28,000
Balance of impaired loans 2,811,000 1,033,000 6,022,000
Allowance for loan losses 0 0 0
Commercial Other [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 1,075,000 571,000 1,020,000
Unpaid Principal, Impaired Loans 1,075,000 571,000 1,020,000
Allowance for loan losses 480,000 326,000 402,000
Average Recorded Investment 2,223,000 549,000 681,000
Recognized Interest Income 5,000 5,000 19,000
Balance of impaired loans 1,075,000 571,000 1,020,000
Allowance for loan losses 480,000 326,000 402,000
Municipal [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 15,961,000 20,834,000 16,221,000
Percentage of loan portfolio (in hundredths) 1.80% 2.30% 1.90%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 0 0 0
90 Plus Days Past Due 0 0 0
All Past Due 0 0 0
Current 15,961,000 20,834,000 16,221,000
Total 15,961,000 20,834,000 16,221,000
90 Plus Days And Accruing 0 0 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 0 0 0
Municipal [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 0 0 0
Unpaid Principal, Impaired Loans 0 0 0
Allowance for loan losses 0 0 0
Average Recorded Investment 0 0 0
Recognized Interest Income 0 0 0
Balance of impaired loans 0 0 0
Allowance for loan losses 0 0 0
Municipal [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 0 0 0
Unpaid Principal, Impaired Loans 0 0 0
Allowance for loan losses 0 0 0
Average Recorded Investment 0 0 0
Recognized Interest Income 0 0 0
Balance of impaired loans 0 0 0
Allowance for loan losses 0 0 0
Residential Term [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 358,394,000 340,841,000 341,286,000
Percentage of loan portfolio (in hundredths) 4.12% 38.10% 39.50%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 3,324,000 5,456,000 3,331,000
90 Plus Days Past Due 9,299,000 8,623,000 8,843,000
All Past Due 12,623,000 14,079,000 12,174,000
Current 345,771,000 326,762,000 329,112,000
Total 358,394,000 340,841,000 341,286,000
90 Plus Days And Accruing 359,000 0 1,118,000
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 10,893,000 9,632,000 10,194,000
Residential Term [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 9,930,000 8,907,000 9,875,000
Unpaid Principal, Impaired Loans 9,930,000 8,907,000 9,875,000
Allowance for loan losses 0 0 0
Average Recorded Investment 10,001,000 8,120,000 9,493,000
Recognized Interest Income 30,000 14,000 54,000
Balance of impaired loans 9,930,000 8,907,000 9,875,000
Allowance for loan losses 0 0 0
Residential Term [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 8,124,000 5,041,000 6,946,000
Unpaid Principal, Impaired Loans 8,124,000 5,041,000 6,946,000
Allowance for loan losses 592,000 381,000 478,000
Average Recorded Investment 7,449,000 5,533,000 5,628,000
Recognized Interest Income 59,000 57,000 228,000
Balance of impaired loans 8,124,000 5,041,000 6,946,000
Allowance for loan losses 592,000 381,000 478,000
Residential Construction [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 6,451,000 13,370,000 10,469,000
Percentage of loan portfolio (in hundredths) 0.70% 1.50% 1.20%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 492,000 0 0
90 Plus Days Past Due 1,454,000 2,247,000 1,198,000
All Past Due 1,946,000 2,247,000 1,198,000
Current 4,505,000 11,123,000 9,271,000
Total 6,451,000 13,370,000 10,469,000
90 Plus Days And Accruing 0 0 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 1,454,000 2,247,000 1,198,000
Residential Construction [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 1,120,000 1,672,000 468,000
Unpaid Principal, Impaired Loans 1,120,000 1,672,000 468,000
Allowance for loan losses 0 0 0
Average Recorded Investment 718,000 2,948,000 961,000
Recognized Interest Income 0 0 0
Balance of impaired loans 1,120,000 1,672,000 468,000
Allowance for loan losses 0 0 0
Residential Construction [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 334,000 576,000 730,000
Unpaid Principal, Impaired Loans 334,000 576,000 730,000
Allowance for loan losses 49,000 106,000 235,000
Average Recorded Investment 598,000 192,000 244,000
Recognized Interest Income 0 0 0
Balance of impaired loans 334,000 576,000 730,000
Allowance for loan losses 49,000 106,000 235,000
Home equity line of credit [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 103,372,000 106,172,000 105,244,000
Percentage of loan portfolio (in hundredths) 11.90% 11.80% 12.10%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 86,000 759,000 480,000
90 Plus Days Past Due 1,156,000 604,000 1,134,000
All Past Due 1,242,000 1,363,000 1,614,000
Current 102,130,000 104,809,000 103,630,000
Total 103,372,000 106,172,000 105,244,000
90 Plus Days And Accruing 0 0 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 1,336,000 604,000 1,163,000
Home equity line of credit [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 774,000 373,000 739,000
Unpaid Principal, Impaired Loans 774,000 373,000 739,000
Allowance for loan losses 0 0 0
Average Recorded Investment 776,000 317,000 646,000
Recognized Interest Income 0 0 0
Balance of impaired loans 774,000 373,000 739,000
Allowance for loan losses 0 0 0
Home equity line of credit [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 562,000 231,000 424,000
Unpaid Principal, Impaired Loans 562,000 231,000 424,000
Allowance for loan losses 156,000 139,000 91,000
Average Recorded Investment 519,000 231,000 272,000
Recognized Interest Income 0 0 0
Balance of impaired loans 562,000 231,000 424,000
Allowance for loan losses 156,000 139,000 91,000
Consumer [Member]
      
Composition of Loan Portfolio [Abstract]      
Amount of loan portfolio 15,711,000 18,589,000 16,788,000
Percentage of loan portfolio (in hundredths) 1.80% 2.10% 1.90%
Loans, aging disclosure [Abstract]      
30-89 Days Past Due 173,000 250,000 331,000
90 Plus Days Past Due 8,000 19,000 16,000
All Past Due 181,000 269,000 347,000
Current 15,530,000 18,320,000 16,441,000
Total 15,711,000 18,589,000 16,788,000
90 Plus Days And Accruing 8,000 19,000 0
Nonaccrual Loans [Abstract]      
Nonaccrual Loans Receivable 15,000 105,000 53,000
Consumer [Member] | With No Related Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 0 39,000 37,000
Unpaid Principal, Impaired Loans 0 39,000 37,000
Allowance for loan losses 0 0 0
Average Recorded Investment 12,000 42,000 39,000
Recognized Interest Income 0 0 0
Balance of impaired loans 0 39,000 37,000
Allowance for loan losses 0 0 0
Consumer [Member] | With an Allowance Recorded [Member]
      
Nonaccrual Loans [Abstract]      
Recorded Investment 15,000 76,000 16,000
Unpaid Principal, Impaired Loans 15,000 76,000 16,000
Allowance for loan losses 10,000 76,000 11,000
Average Recorded Investment 15,000 73,000 57,000
Recognized Interest Income 0 0 0
Balance of impaired loans 15,000 76,000 16,000
Allowance for loan losses $ 10,000 $ 76,000 $ 11,000