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Investment Securities | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The following tables summarize the amortized cost and estimated fair value of investment securities at December 31, 2017 and 2016:
| Amortized |  | Unrealized |  | Unrealized |  | Fair Value
As of December 31, 2017 | Cost |  | Gains |  | Losses |  | (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 293,689,000 |  |  | $ | 722,000 |  |  | $ | (4,422,000 | ) |  | $ | 289,989,000 |
State and political subdivisions | 6,860,000 |  |  | 16,000 |  |  | (107,000 | ) |  | 6,769,000 |
Other equity securities | 3,296,000 |  |  | 121,000 |  |  | (3,000 | ) |  | 3,414,000 |
| $ | 303,845,000 |  |  | $ | 859,000 |  |  | $ | (4,532,000 | ) |  | $ | 300,172,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,155,000 |  |  | $ | — |  |  | $ | (180,000 | ) |  | $ | 10,975,000 |
Mortgage-backed securities | 23,284,000 |  |  | 568,000 |  |  | (128,000 | ) |  | 23,724,000 |
State and political subdivisions | 217,828,000 |  |  | 3,931,000 |  |  | (1,103,000 | ) |  | 220,656,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 256,567,000 |  |  | $ | 4,499,000 |  |  | $ | (1,411,000 | ) |  | $ | 259,655,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 9,321,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,321,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 10,358,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,358,000 |
| Amortized |  | Unrealized |  | Unrealized |  | Fair Value
As of December 31, 2016 | Cost |  | Gains |  | Losses |  | (Estimated)
Securities available for sale |  |  |  |  |  |  |
Mortgage-backed securities | $ | 282,397,000 |  |  | $ | 1,334,000 |  |  | $ | (3,127,000 | ) |  | $ | 280,604,000 |
State and political subdivisions | 16,183,000 |  |  | 475,000 |  |  | (176,000 | ) |  | 16,482,000 |
Other equity securities | 3,274,000 |  |  | 63,000 |  |  | (7,000 | ) |  | 3,330,000 |
| $ | 301,854,000 |  |  | $ | 1,872,000 |  |  | $ | (3,310,000 | ) |  | $ | 300,416,000 |
Securities to be held to maturity |  |  |  |  |  |  |
U.S. Government-sponsored agencies | $ | 11,943,000 |  |  | $ | 35,000 |  |  | $ | (233,000 | ) |  | $ | 11,745,000 |
Mortgage-backed securities | 31,201,000 |  |  | 967,000 |  |  | (147,000 | ) |  | 32,021,000 |
State and political subdivisions | 179,384,000 |  |  | 1,971,000 |  |  | (3,884,000 | ) |  | 177,471,000 |
Corporate securities | 4,300,000 |  |  | — |  |  | — |  |  | 4,300,000 |
| $ | 226,828,000 |  |  | $ | 2,973,000 |  |  | $ | (4,264,000 | ) |  | $ | 225,537,000 |
Restricted equity securities |  |  |  |  |  |  |
Federal Home Loan Bank Stock | $ | 10,893,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,893,000 |
Federal Reserve Bank Stock | 1,037,000 |  |  | — |  |  | — |  |  | 1,037,000 |
| $ | 11,930,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 11,930,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2017:
| 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 | $ | 111,000 |  |  | $ | 112,000 |  |  | $ | 635,000 |  |  | $ | 637,000 |
Due in 1 to 5 years | 841,000 |  |  | 842,000 |  |  | 18,059,000 |  |  | 18,164,000 |
Due in 5 to 10 years | 29,003,000 |  |  | 29,177,000 |  |  | 37,182,000 |  |  | 37,719,000 |
Due after 10 years | 270,594,000 |  |  | 266,627,000 |  |  | 200,691,000 |  |  | 203,135,000 |
Equity securities | 3,296,000 |  |  | 3,414,000 |  |  | — |  |  | — |
| $ | 303,845,000 |  |  | $ | 300,172,000 |  |  | $ | 256,567,000 |  |  | $ | 259,655,000 |
The following table summarizes the contractual maturities of investment securities at December 31, 2016:
| 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 | $ | 253,000 |  |  | $ | 253,000 |  |  | $ | 906,000 |  |  | $ | 913,000 |
Due in 1 to 5 years | 2,251,000 |  |  | 2,298,000 |  |  | 13,451,000 |  |  | 13,714,000 |
Due in 5 to 10 years | 21,043,000 |  |  | 21,505,000 |  |  | 41,588,000 |  |  | 42,448,000 |
Due after 10 years | 275,033,000 |  |  | 273,030,000 |  |  | 170,883,000 |  |  | 168,462,000 |
Equity securities | 3,274,000 |  |  | 3,330,000 |  |  | — |  |  | — |
| $ | 301,854,000 |  |  | $ | 300,416,000 |  |  | $ | 226,828,000 |  |  | $ | 225,537,000 |
At December 31, 2017, securities with a fair value of $231,516,000 were pledged to secure borrowings from the Federal Home Loan Bank of Boston, public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $222,328,000 as of December 31, 2016 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 2017, 2016 and 2015:
| 2017 |  | 2016 |  | 2015
Proceeds from sales of securities | $ | 15,587,000 |  |  | $ | 10,309,000 |  |  | $ | 35,468,000 |
Gross realized gains | 471,000 |  |  | 673,000 |  |  | 1,399,000 |
Gross realized losses | — |  |  | — |  |  | — |
Net gain | $ | 471,000 |  |  | $ | 673,000 |  |  | $ | 1,399,000 |
Related income taxes | $ | 165,000 |  |  | $ | 236,000 |  |  | $ | 490,000 |
Management reviews securities with unrealized losses for other than temporary impairment. As of December 31, 2017, there were 241 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 157 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 December 31, 2017 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
As of December 31, 2017 | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U.S. Government-sponsored agencies | $ | 7,161,000 |  |  | $ | (94,000 | ) |  | $ | 3,814,000 |  |  | $ | (86,000 | ) |  | $ | 10,975,000 |  |  | $ | (180,000 | )
Mortgage-backed securities | 132,025,000 |  |  | (1,857,000 | ) |  | 101,707,000 |  |  | (2,693,000 | ) |  | 233,732,000 |  |  | (4,550,000 | )
State and political subdivisions | 9,425,000 |  |  | (149,000 | ) |  | 38,864,000 |  |  | (1,061,000 | ) |  | 48,289,000 |  |  | (1,210,000 | )
Other equity securities | — |  |  | — |  |  | 9,000 |  |  | (3,000 | ) |  | 9,000 |  |  | (3,000 | )
| $ | 148,611,000 |  |  | $ | (2,100,000 | ) |  | $ | 144,394,000 |  |  | $ | (3,843,000 | ) |  | $ | 293,005,000 |  |  | $ | (5,943,000 | )
As of December 31, 2016, there were 299 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 15 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2016 is summarized below:
| Less than 12 months |  | 12 months or more |  | Total
| Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
As of December 31, 2016 | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
U.S. Government-sponsored agencies | $ | 6,642,000 |  |  | $ | (233,000 | ) |  | $ | — |  |  | $ | — |  |  | $ | 6,642,000 |  |  | $ | (233,000 | )
Mortgage-backed securities | 197,528,000 |  |  | (3,090,000 | ) |  | 2,905,000 |  |  | (184,000 | ) |  | 200,433,000 |  |  | (3,274,000 | )
State and political subdivisions | 72,348,000 |  |  | (4,060,000 | ) |  | — |  |  | — |  |  | 72,348,000 |  |  | (4,060,000 | )
Other equity securities | — |  |  | — |  |  | 128,000 |  |  | (7,000 | ) |  | 128,000 |  |  | (7,000 | )
| $ | 276,518,000 |  |  | $ | (7,383,000 | ) |  | $ | 3,033,000 |  |  | $ | (191,000 | ) |  | $ | 279,551,000 |  |  | $ | (7,574,000 | )
During the third quarter of 2014, the Company transferred securities with a total amortized cost of $89,780,000 and a corresponding fair value of $89,757,000 from available for sale to held to maturity. The net unrealized loss, net of taxes, on these securities at the date of the transfer was $15,000. The net unrealized holding loss at the time of transfer continues to be reported in accumulated other comprehensive income (loss), net of tax and is amortized over the remaining lives of the securities as an adjustment of the yield. The amortization of the net unrealized loss reported in accumulated other comprehensive income (loss) will offset the effect on interest income of the discount for the transferred securities. The remaining unamortized balance of the net unrealized losses for the securities transferred from available for sale to held to maturity was $174,000 at December 31, 2017. These securities were transferred as a part of the Company's overall investment and balance sheet strategies. 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 December 31, 2017 and 2016, the Bank's investment in FHLB stock totaled $9,321,000 and $10,893,000, respectively. FHLB stock is a restricted equity security and therefore is reported at cost, which equals par value. The Company periodically evaluates its investment in FHLB stock for impairment based on, among other factors, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through December 31, 2017. The Bank will continue to monitor its investment in FHLB stock.

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