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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity 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 |
Contractual Maturities of Investment Securities | 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 |
Schedule of Securities Gains and Losses | 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 |
Schedule of Temporary Impairment Losses | 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 | )

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: 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=82897076&loc=d3e27290-111563 + Details
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