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Investment Securities | 6 Months Ended
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Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2013:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 157,023,000 |  |  | $ | 2,014,000 |  |  | $ | (1,513,000 | ) |  | $ | 157,524,000 |
State and political subdivisions | 134,376,000 |  |  | 1,955,000 |  |  | (7,792,000 | ) |  | 128,539,000 |
Other equity securities | 1,617,000 |  |  | 63,000 |  |  | (8,000 | ) |  | 1,672,000 |
| $ | 293,016,000 |  |  | $ | 4,032,000 |  |  | $ | (9,313,000 | ) |  | $ | 287,735,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 92,179,000 |  |  | $ | 10,000 |  |  | $ | (5,944,000 | ) |  | $ | 86,245,000 |
Mortgage-backed securities | 42,389,000 |  |  | 1,883,000 |  |  | (625,000 | ) |  | 43,647,000 |
State and political subdivisions | 42,396,000 |  |  | 2,268,000 |  |  | (66,000 | ) |  | 44,598,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 177,264,000 |  |  | $ | 4,161,000 |  |  | $ | (6,635,000 | ) |  | $ | 174,790,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 12,875,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,875,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 13,912,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,912,000 |
The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2012:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 164,752,000 |  |  | $ | 4,636,000 |  |  | $ | (295,000 | ) |  | $ | 169,093,000 |
State and political subdivisions | 113,069,000 |  |  | 8,074,000 |  |  | (199,000 | ) |  | 120,944,000 |
Other equity securities | 1,578,000 |  |  | 43,000 |  |  | (44,000 | ) |  | 1,577,000 |
| $ | 279,399,000 |  |  | $ | 12,753,000 |  |  | $ | (538,000 | ) |  | $ | 291,614,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 60,919,000 |  |  | $ | 242,000 |  |  | $ | (182,000 | ) |  | $ | 60,979,000 |
Mortgage-backed securities | 39,193,000 |  |  | 2,850,000 |  |  | (19,000 | ) |  | 42,024,000 |
State and political subdivisions | 42,908,000 |  |  | 4,036,000 |  |  | — |  |  | 46,944,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 143,320,000 |  |  | $ | 7,128,000 |  |  | $ | (201,000 | ) |  | $ | 150,247,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 13,412,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,412,000 |
Federal Reserve Bank Stock | 1,036,000 |  |  | — |  |  | — |  |  | 1,036,000 |
| $ | 14,448,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,448,000 |
The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2012:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 201,552,000 |  |  | $ | 5,677,000 |  |  | $ | (250,000 | ) |  | $ | 206,979,000 |
State and political subdivisions | 92,353,000 |  |  | 6,291,000 |  |  | (51,000 | ) |  | 98,593,000 |
Other equity securities | 1,863,000 |  |  | 47,000 |  |  | (135,000 | ) |  | 1,775,000 |
| $ | 295,768,000 |  |  | $ | 12,015,000 |  |  | $ | (436,000 | ) |  | $ | 307,347,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 41,197,000 |  |  | $ | 282,000 |  |  | $ | (33,000 | ) |  | $ | 41,446,000 |
Mortgage-backed securities | 49,992,000 |  |  | 3,524,000 |  |  | (8,000 | ) |  | 53,508,000 |
State and political subdivisions | 44,286,000 |  |  | 4,088,000 |  |  | — |  |  | 48,374,000 |
Corporate securities | 300,000 |  |  | — |  |  | — |  |  | 300,000 |
| $ | 135,775,000 |  |  | $ | 7,894,000 |  |  | $ | (41,000 | ) |  | $ | 143,628,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 13,412,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,412,000 |
Federal Reserve Bank Stock | 1,036,000 |  |  | — |  |  | — |  |  | 1,036,000 |
| $ | 14,448,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,448,000 |
The following table summarizes the contractual maturities of investment securities at June 30, 2013:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 1,345,000 |  |  | $ | 1,368,000 |  |  | $ | 766,000 |  |  | $ | 773,000 |
Due in 1 to 5 years | 139,000 |  |  | 140,000 |  |  | 6,081,000 |  |  | 6,462,000 |
Due in 5 to 10 years | 2,426,000 |  |  | 2,563,000 |  |  | 24,873,000 |  |  | 26,299,000 |
Due after 10 years | 287,489,000 |  |  | 281,992,000 |  |  | 145,544,000 |  |  | 141,256,000 |
Equity securities | 1,617,000 |  |  | 1,672,000 |  |  | — |  |  | — |
| $ | 293,016,000 |  |  | $ | 287,735,000 |  |  | $ | 177,264,000 |  |  | $ | 174,790,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2012:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 18,761,000 |  |  | $ | 18,926,000 |  |  | $ | 3,754,000 |  |  | $ | 3,785,000 |
Due in 1 to 5 years | 27,243,000 |  |  | 27,816,000 |  |  | 11,950,000 |  |  | 12,701,000 |
Due in 5 to 10 years | 16,686,000 |  |  | 17,666,000 |  |  | 27,461,000 |  |  | 29,986,000 |
Due after 10 years | 215,131,000 |  |  | 225,629,000 |  |  | 100,155,000 |  |  | 103,775,000 |
Equity securities | 1,578,000 |  |  | 1,577,000 |  |  | — |  |  | — |
| $ | 279,399,000 |  |  | $ | 291,614,000 |  |  | $ | 143,320,000 |  |  | $ | 150,247,000 |
The following table summarizes the contractual maturities of investment securities at June 30, 2012:
| Securities available for sale |  | Securities to be held to maturity
| Amortized Cost |  | Fair Value (Estimated) |  | Amortized Cost |  | Fair Value (Estimated)
Due in 1 year or less | $ | 4,296,000 |  |  | $ | 4,328,000 |  |  | $ | 1,382,000 |  |  | $ | 1,399,000 |
Due in 1 to 5 years | 55,317,000 |  |  | 56,358,000 |  |  | 13,556,000 |  |  | 14,134,000 |
Due in 5 to 10 years | 23,143,000 |  |  | 24,034,000 |  |  | 21,137,000 |  |  | 22,958,000 |
Due after 10 years | 211,149,000 |  |  | 220,852,000 |  |  | 99,700,000 |  |  | 105,137,000 |
Equity securities | 1,863,000 |  |  | 1,775,000 |  |  | — |  |  | — |
| $ | 295,768,000 |  |  | $ | 307,347,000 |  |  | $ | 135,775,000 |  |  | $ | 143,628,000 |
At June 30, 2013, securities with a fair value of $123,571,000 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 $154,817,000 as of December 31, 2012 and $140,384,000 at June 30, 2012, 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 six months and quarters ended June 30, 2013 and 2012:
| For the six months ended June 30, |  | For the quarters ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Proceeds from sales of securities | $ | 10,563,000 |  |  | $ | 25,137,000 |  |  | $ | 5,598,000 |  |  | $ | 14,194,000 |
Gross realized gains | 1,087,000 |  |  | 2,256,000 |  |  | 788,000 |  |  | 1,444,000 |
Gross realized losses | — |  |  | (289,000 | ) |  | — |  |  | — |
Net gain | $ | 1,087,000 |  |  | $ | 1,967,000 |  |  | $ | 788,000 |  |  | $ | 1,444,000 |
Related income taxes | $ | 380,000 |  |  | $ | 688,000 |  |  | $ | 275,000 |  |  | $ | 505,000 |
Management reviews securities with unrealized losses for other than temporary impairment. As of June 30, 2013, there were 280 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 six 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 June 30, 2013 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 85,453,000 |  |  | $ | (5,944,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 85,453,000 |  |  | $ | (5,944,000 | )
Mortgage-backed securities | 58,706,000 |  |  | (2,039,000 | ) |  | 1,585,000 |  |  | (99,000 | ) |  | 60,291,000 |  |  | (2,138,000 | )
State and political subdivisions | 71,738,000 |  |  | (7,858,000 | ) |  | — |  |  | — |  |  | 71,738,000 |  |  | (7,858,000 | )
Other equity securities | — |  |  | — |  |  | 110,000 |  |  | (8,000 | ) |  | 110,000 |  |  | (8,000 | )
| $ | 215,897,000 |  |  | $ | (15,841,000 | ) |  | $ | 1,695,000 |  |  | $ | (107,000 | ) |  | $ | 217,592,000 |  |  | $ | (15,948,000 | )
As of December 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 value, of which seven had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2012 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 15,817,000 |  |  | $ | (182,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,817,000 |  |  | $ | (182,000 | )
Mortgage-backed securities | 9,982,000 |  |  | (231,000 | ) |  | 2,534,000 |  |  | (83,000 | ) |  | 12,516,000 |  |  | (314,000 | )
State and political subdivisions | 8,621,000 |  |  | (199,000 | ) |  | — |  |  | — |  |  | 8,621,000 |  |  | (199,000 | )
Other equity securities | — |  |  | — |  |  | 222,000 |  |  | (44,000 | ) |  | 222,000 |  |  | (44,000 | )
| $ | 34,420,000 |  |  | $ | (612,000 | ) |  | $ | 2,756,000 |  |  | $ | (127,000 | ) |  | $ | 37,176,000 |  |  | $ | (739,000 | )
As of June 30, 2012, there were 30 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 eight had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of June 30, 2012 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses |  | Fair Value (Estimated) |  | Unrealized Losses
U.S. Government-sponsored agencies | $ | 7,942,000 |  |  | $ | (33,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 7,942,000 |  |  | $ | (33,000 | )
Mortgage-backed securities | 9,822,000 |  |  | (110,000 | ) |  | 5,137,000 |  |  | (148,000 | ) |  | 14,959,000 |  |  | (258,000 | )
State and political subdivisions | 3,719,000 |  |  | (51,000 | ) |  | — |  |  | — |  |  | 3,719,000 |  |  | (51,000 | )
Other equity securities | — |  |  | — |  |  | 191,000 |  |  | (135,000 | ) |  | 191,000 |  |  | (135,000 | )
| $ | 21,483,000 |  |  | $ | (194,000 | ) |  | $ | 5,328,000 |  |  | $ | (283,000 | ) |  | $ | 26,811,000 |  |  | $ | (477,000 | )
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 six 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 June 30, 2013 and 2012, and December 31, 2012, the Bank's investment in FHLB stock totaled $12,875,000, $13,412,000 and $13,412,000, respectively. FHLB stock is a non-marketable equity security and therefore is reported at cost, which equals par value.

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