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Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Costs and Fair Values of Securities | Amortized costs and fair values of securities at December 31, 2017 and 2016 were as follows (in thousands):
| 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 76,074 |  |  | $ | 67 |  |  | $ | (1,337 | ) |  | $ | 74,804 |
Obligations of states and political subdivisions | 14,520 |  |  | 86 |  |  | (155 | ) |  | 14,451 |
Total securities available for sale | $ | 90,594 |  |  | $ | 153 |  |  | $ | (1,492 | ) |  | $ | 89,255 |
Securities held to maturity: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 32,149 |  |  | $ | — |  |  | $ | (551 | ) |  | $ | 31,598 |
Obligations of states and political subdivisions | 14,559 |  |  | 74 |  |  | (45 | ) |  | 14,588 |
Corporate debt securities | 1,500 |  |  | 16 |  |  | — |  |  | 1,516 |
Total securities held to maturity | $ | 48,208 |  |  | $ | 90 |  |  | $ | (596 | ) |  | $ | 47,702 |
Total securities | $ | 138,802 |  |  | $ | 243 |  |  | $ | (2,088 | ) |  | $ | 136,957 |
| 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 81,451 |  |  | $ | 177 |  |  | $ | (1,457 | ) |  | $ | 80,171 |
Obligations of states and political subdivisions | 14,654 |  |  | 146 |  |  | (180 | ) |  | 14,620 |
Corporate equity securities | 1 |  |  | 10 |  |  | — |  |  | 11 |
Total securities available for sale | $ | 96,106 |  |  | $ | 333 |  |  | $ | (1,637 | ) |  | $ | 94,802 |
Securities held to maturity: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 37,269 |  |  | $ | 1 |  |  | $ | (483 | ) |  | $ | 36,787 |
Obligations of states and political subdivisions | 14,629 |  |  | 18 |  |  | (211 | ) |  | 14,436 |
Corporate debt securities | 1,500 |  |  | — |  |  | (14 | ) |  | 1,486 |
Total securities held to maturity | $ | 53,398 |  |  | $ | 19 |  |  | $ | (708 | ) |  | $ | 52,709 |
Total securities | $ | 149,504 |  |  | $ | 352 |  |  | $ | (2,345 | ) |  | $ | 147,511 |
Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired | At December 31, 2017 and 2016, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands):
| 2017
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized (Loss) |  | Fair Value |  | Unrealized (Loss) |  | Fair Value |  | Unrealized (Loss)
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 29,963 |  |  | $ | (286 | ) |  | $ | 30,362 |  |  | $ | (1,051 | ) |  | $ | 60,325 |  |  | $ | (1,337 | )
Obligations of states and political subdivisions | 4,469 |  |  | (53 | ) |  | 1,961 |  |  | (102 | ) |  | 6,430 |  |  | (155 | )
Total securities available for sale | $ | 34,432 |  |  | $ | (339 | ) |  | $ | 32,323 |  |  | $ | (1,153 | ) |  | $ | 66,755 |  |  | $ | (1,492 | )
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 18,301 |  |  | $ | (205 | ) |  | $ | 13,297 |  |  | $ | (346 | ) |  | $ | 31,598 |  |  | $ | (551 | )
Obligations of states and political subdivisions | 6,889 |  |  | (45 | ) |  | — |  |  | — |  |  | 6,889 |  |  | (45 | )
Total securities held to maturity | $ | 25,190 |  |  | $ | (250 | ) |  | $ | 13,297 |  |  | $ | (346 | ) |  | $ | 38,487 |  |  | $ | (596 | )
Total securities | $ | 59,622 |  |  | $ | (589 | ) |  | $ | 45,620 |  |  | $ | (1,499 | ) |  | $ | 105,242 |  |  | $ | (2,088 | )
| 2016
| Less than 12 months |  | 12 months or more |  | Total
| Fair Value |  | Unrealized (Loss) |  | Fair Value |  | Unrealized (Loss) |  | Fair Value |  | Unrealized (Loss)
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 60,943 |  |  | $ | (1,249 | ) |  | $ | 5,499 |  |  | $ | (208 | ) |  | $ | 66,442 |  |  | $ | (1,457 | )
Obligations of states and political subdivisions | 5,130 |  |  | (180 | ) |  | — |  |  | — |  |  | 5,130 |  |  | (180 | )
Total securities available for sale | $ | 66,073 |  |  | $ | (1,429 | ) |  | $ | 5,499 |  |  | $ | (208 | ) |  | $ | 71,572 |  |  | $ | (1,637 | )
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 34,770 |  |  | $ | (483 | ) |  | $ | — |  |  | $ | — |  |  | $ | 34,770 |  |  | $ | (483 | )
Obligations of states and political subdivisions | 12,724 |  |  | (211 | ) |  | — |  |  | — |  |  | 12,724 |  |  | (211 | )
Corporate debt securities | $ | 1,486 |  |  | $ | (14 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1,486 |  |  | $ | (14 | )
Total securities held to maturity | $ | 48,980 |  |  | $ | (708 | ) |  | $ | — |  |  | $ | — |  |  | $ | 48,980 |  |  | $ | (708 | )
Total securities | $ | 115,053 |  |  | $ | (2,137 | ) |  | $ | 5,499 |  |  | $ | (208 | ) |  | $ | 120,552 |  |  | $ | (2,345 | )
Amortized Cost and Fair Value of Securities | The amortized cost and fair value of securities at December 31, 2017 by contractual maturity are shown below (in thousands). Expected maturities of mortgage-backed securities will differ from contractual maturities because borrowers may have the right to prepay obligations with or without call or prepayment penalties.
| Available for Sale |  | Held to Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 600 |  |  | $ | 601 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 9,040 |  |  | 9,048 |  |  | 6,186 |  |  | 6,144 |
Due after five years through ten years | 8,920 |  |  | 8,774 |  |  | 14,160 |  |  | 14,158 |
Due after ten years | 72,034 |  |  | 70,832 |  |  | 27,862 |  |  | 27,400 |
| $ | 90,594 |  |  | $ | 89,255 |  |  | $ | 48,208 |  |  | $ | 47,702 |
Composition of Restricted Securities | The composition of restricted securities at December 31, 2017 and 2016 was as follows (in thousands):
| 2017 |  | 2016
Federal Home Loan Bank stock | $ | 645 |  |  | $ | 623 |
Federal Reserve Bank stock | 875 |  |  | 875 |
Community Bankers’ Bank stock | 50 |  |  | 50 |
| $ | 1,570 |  |  | $ | 1,548 |

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