| **Investment Securities**             | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Investments Securities [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Investment Securities                 | Note 2 - Investment SecuritiesThe following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2012:   Amortized  Unrealized  Unrealized  Fair Value    Cost  Gains  Losses  (Estimated) Securities available for sale            U.S. Treasury and agency $-  $-  $-  $- Mortgage-backed securities  226,671,000   5,805,000   (361,000)  232,115,000 State and political subdivisions  77,672,000   5,540,000   (50,000)  83,162,000 Corporate securities  -   -   -   - Other equity securities  1,863,000   44,000   (73,000)  1,834,000    $306,206,000  $11,389,000  $(484,000) $317,111,000 Securities to be held to maturity                U.S. Treasury and agency $39,694,000  $37,000  $(435,000) $39,296,000 Mortgage-backed securities  52,185,000   3,638,000   -   55,823,000 State and political subdivisions  45,427,000   3,941,000   (154,000)  49,214,000 Corporate securities  300,000   -   -   300,000    $137,606,000  $7,616,000  $(589,000) $144,633,000 Non-marketable securities                Federal Home Loan Bank Stock $13,412,000  $-  $-  $13,412,000 Federal Reserve Bank Stock  1,411,000   -   -   1,411,000    $14,823,000  $-  $-  $14,823,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2011:   Amortized  Unrealized  Unrealized  Fair Value    Cost  Gains  Losses  (Estimated) Securities available for sale            U.S. Treasury and agency $-  $-  $-  $- Mortgage-backed securities  191,924,000   6,486,000   (178,000)  198,232,000 State and political subdivisions  80,259,000   5,484,000   (17,000)  85,726,000 Corporate securities  1,098,000   -   (287,000)  811,000 Other equity securities  1,535,000   37,000   (139,000)  1,433,000    $274,816,000  $12,007,000  $(621,000) $286,202,000 Securities to be held to maturity                U.S. Treasury and agency $19,390,000  $132,000  $-  $19,522,000 Mortgage-backed securities  56,800,000   3,900,000   (3,000)  60,697,000 State and political subdivisions  46,171,000   4,159,000   (172,000)  50,158,000 Corporate securities  300,000   -   -   300,000    $122,661,000  $8,191,000  $(175,000) $130,677,000 Non-marketable securities                Federal Home Loan Bank Stock $14,032,000  $-  $-  $14,032,000 Federal Reserve Bank Stock  1,411,000   -   -   1,411,000    $15,443,000  $-  $-  $15,443,000 The following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2011:   Amortized  Unrealized  Unrealized  Fair Value    Cost  Gains  Losses  (Estimated) Securities available for sale            U.S. Treasury and agency $15,352,000  $591,000  $-  $15,943,000 Mortgage-backed securities  255,703,000   1,138,000   (3,731,000)  253,110,000 State and political subdivisions  55,040,000   577,000   (536,000)  55,081,000 Corporate securities  1,108,000   -   (185,000)  923,000 Other equity securities  385,000   18,000   (9,000)  394,000    $327,588,000  $2,324,000  $(4,461,000) $325,451,000 Securities to be held to maturity                U.S. Treasury and agency $2,936,000  $-  $(292,000) $2,644,000 Mortgage-backed securities  59,063,000   3,348,000   (76,000)  62,335,000 State and political subdivisions  47,787,000   1,641,000   (506,000)  48,922,000 Corporate securities  150,000   -   -   150,000    $109,936,000  $4,989,000  $(874,000) $114,051,000 Non-marketable securities                Federal Home Loan Bank Stock $14,032,000  $-  $-  $14,032,000 Federal Reserve Bank Stock  1,411,000   -   -   1,411,000    $15,443,000  $-  $-  $15,443,000 The following table summarizes the contractual maturities of investment securities at March 31, 2012:   Securities available for sale  Securities to be held to maturity    AmortizedCost  Fair Value (Estimated)  AmortizedCost  Fair Value (Estimated) Due in 1 year or less $5,894,000  $5,948,000  $4,663,000  $4,710,000 Due in 1 to 5 years  59,887,000   60,971,000   12,173,000   12,940,000 Due in 5 to 10 years  13,014,000   13,442,000   35,563,000   38,100,000 Due after 10 years  225,548,000   234,916,000   85,207,000   88,883,000 Equity securities  1,863,000   1,834,000   -   -    $306,206,000  $317,111,000  $137,606,000  $144,633,000 The following table summarizes the contractual maturities of investment securities at December 31, 2011:   Securities available for sale  Securities to be held to maturity    AmortizedCost  Fair Value (Estimated)  AmortizedCost  Fair Value (Estimated) Due in 1 year or less $6,617,000  $6,773,000  $5,179,000  $5,227,000 Due in 1 to 5 years  18,792,000   19,473,000   10,085,000   10,654,000 Due in 5 to 10 years  23,219,000   24,065,000   23,027,000   24,694,000 Due after 10 years  224,653,000   234,458,000   84,370,000   90,102,000 Equity securities  1,535,000   1,433,000   -   -    $274,816,000  $286,202,000  $122,661,000  $130,677,000 The following table summarizes the contractual maturities of investment securities at March 31, 2011:   Securities available for sale  Securities to be held to maturity    AmortizedCost  Fair Value (Estimated)  AmortizedCost  Fair Value (Estimated) Due in 1 year or less $212,000  $218,000  $1,072,000  $1,084,000 Due in 1 to 5 years  2,818,000   2,964,000   5,629,000   5,948,000 Due in 5 to 10 years  4,774,000   4,916,000   16,974,000   17,737,000 Due after 10 years  319,399,000   316,959,000   86,261,000   89,282,000 Equity securities  385,000   394,000   -   -    $327,588,000  $325,451,000  $109,936,000  $114,051,000 At March 31, 2012, securities with a fair value of $136,156,000 were pledged to secure public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $141,506,000 as of December 31, 2011 and $121,143,000 at March 31, 2011, pledged for the same purposes.Gains and losses on the sale of securities available for sale are computed by subtracting the amortized cost at the time of sale from the security's selling price, net of accrued interest to be received. The following table shows securities gains and losses for the three months ended March 31, 2012 and 2011:   For the three months endedMarch 31, 2012  For the three months ended March 31, 2011 Proceeds from sales $10,943,000  $- Gross gains $812,000  $- Gross losses $(289,000) $- Net gain $523,000  $- Related income taxes $183,000  $- Management reviews securities with unrealized losses for other than temporary impairment. As of March 31, 2012, there were 42 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair market value, of which 8 had been temporarily impaired for 12 months or more. At the present time, there have been no material changes in the credit quality of these securities resulting in other than temporary impairment, and in Management's opinion, no additional write-down for other-than-temporary impairment is warranted. Information regarding securities temporarily impaired as of March 31, 2012 is summarized below:   Less than 12 months  12 months or more  Total    Fair  Unrealized  Fair  Unrealized  Fair  Unrealized    Value  Losses  Value  Losses  Value  Losses U.S. Treasury and agency $33,514,000  $(435,000) $-  $-  $33,514,000  $(435,000)Mortgage-backed securities  35,242,000   (280,000)  6,608,000   (81,000)  41,850,000   (361,000)State and political subdivisions  4,924,000   (204,000)  -   -   4,924,000   (204,000)Corporate securities  -   -   -   -   -   - Other equity securities  -   -   253,000   (73,000)  253,000   (73,000)   $73,680,000  $(919,000) $6,861,000  $(154,000) $80,541,000  $(1,073,000)As of December 31, 2011, there were 29 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 11 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2011 is summarized below:   Less than 12 months  12 months or more  Total    Fair  Unrealized  Fair  Unrealized  Fair  Unrealized    Value  Losses  Value  Losses  Value  Losses U.S. Treasury and agency $-  $-  $-  $-  $-  $- Mortgage-backed securities  12,489,000   (25,000)  6,780,000   (156,000)  19,269,000   (181,000)State and political subdivisions  1,984,000   (17,000)  1,667,000   (172,000)  3,651,000   (189,000)Corporate securities  -   -   811,000   (287,000)  811,000   (287,000)Other equity securities  154,000   (120,000)  34,000   (19,000)  188,000   (139,000)   $14,627,000  $(162,000) $9,292,000  $(634,000) $23,919,000  $(796,000)As of March 31, 2011, there were 104 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair market value, of which 12 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of March 31, 2011 is summarized below:   Less than 12 months  12 months or more  Total    Fair  Unrealized  Fair  Unrealized  Fair  Unrealized    Value  Losses  Value  Losses  Value  Losses U.S. Treasury and agency $2,645,000  $(292,000) $-  $-  $2,645,000  $(292,000)Mortgage-backed securities  187,278,000   (3,471,000)  6,757,000   (336,000)  194,035,000   (3,807,000)State and political subdivisions  29,835,000   (659,000)  1,398,000   (383,000)  31,233,000   (1,042,000)Corporate securities  -   -   922,000   (185,000)  922,000   (185,000)Other equity securities  10,000   (2,000)  47,000   (7,000)  57,000   (9,000)   $219,768,000  $(4,424,000) $9,124,000  $(911,000) $228,892,000  $(5,335,000)The Bank is a member of the Federal Home Loan Bank ("FHLB") of Boston, a cooperatively owned wholesale bank for housing and finance in the 6 New England States. As a requirement of membership in the FHLB, the Bank must own a minimum required amount of FHLB stock, calculated periodically based primarily on its level of borrowings from the FHLB. The Bank uses the FHLB for much of its wholesale funding needs. As of March 31, 2012 and 2011, and December 31, 2011, the Bank's investment in FHLB stock totaled $13.4 million and $14.0 million, respectively. FHLB stock is a non-marketable equity security and therefore is reported at cost, which equals par value. |

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| - Definition
Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes.  A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 -Topic 320Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 -Topic 320Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563
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