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Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Costs and Fair Values of Securities | Amortized costs and fair values of securities at September 30, 2018 and December 31, 2017 were as follows (in thousands):
| September 30, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 91,126 |  |  | $ | 14 |  |  | $ | (3,097 | ) |  | $ | 88,043 |
Obligations of states and political subdivisions | 15,071 |  |  | 25 |  |  | (391 | ) |  | 14,705 |
Total securities available for sale | $ | 106,197 |  |  | $ | 39 |  |  | $ | (3,488 | ) |  | $ | 102,748 |
Securities held to maturity: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 28,233 |  |  | $ | — |  |  | $ | (1,208 | ) |  | $ | 27,025 |
Obligations of states and political subdivisions | 14,506 |  |  | 7 |  |  | (320 | ) |  | 14,193 |
Corporate debt securities | 1,500 |  |  | — |  |  | (11 | ) |  | 1,489 |
Total securities held to maturity | $ | 44,239 |  |  | $ | 7 |  |  | $ | (1,539 | ) |  | $ | 42,707 |
Total securities | $ | 150,436 |  |  | $ | 46 |  |  | $ | (5,027 | ) |  | $ | 145,455 |
| December 31, 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 |
Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired | At September 30, 2018 and December 31, 2017, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands):
| September 30, 2018
| 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 | $ | 55,198 |  |  | $ | (1,315 | ) |  | $ | 31,743 |  |  | $ | (1,782 | ) |  | $ | 86,941 |  |  | $ | (3,097 | )
Obligations of states and political subdivisions | 8,257 |  |  | (147 | ) |  | 3,063 |  |  | (244 | ) |  | 11,320 |  |  | (391 | )
Total securities available for sale | $ | 63,455 |  |  | $ | (1,462 | ) |  | $ | 34,806 |  |  | $ | (2,026 | ) |  | $ | 98,261 |  |  | $ | (3,488 | )
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 8,687 |  |  | $ | (334 | ) |  | $ | 18,338 |  |  | $ | (874 | ) |  | $ | 27,025 |  |  | $ | (1,208 | )
Obligations of states and political subdivisions | 12,452 |  |  | (309 | ) |  | 338 |  |  | (11 | ) |  | 12,790 |  |  | (320 | )
Corporate debt securities | 1,489 |  |  | (11 | ) |  | — |  |  | — |  |  | 1,489 |  |  | (11 | )
Total securities held to maturity | $ | 22,628 |  |  | $ | (654 | ) |  | $ | 18,676 |  |  | $ | (885 | ) |  | $ | 41,304 |  |  | $ | (1,539 | )
Total securities | $ | 86,083 |  |  | $ | (2,116 | ) |  | $ | 53,482 |  |  | $ | (2,911 | ) |  | $ | 139,565 |  |  | $ | (5,027 | )
| December 31, 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 | )
Amortized Cost and Fair Value of Securities | The amortized cost and fair value of securities at September 30, 2018 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 | $ | 1,585 |  |  | $ | 1,596 |  |  | $ | 629 |  |  | $ | 630 |
Due after one year through five years | 7,629 |  |  | 7,532 |  |  | 6,772 |  |  | 6,607 |
Due after five years through ten years | 13,832 |  |  | 13,318 |  |  | 13,560 |  |  | 13,228 |
Due after ten years | 83,151 |  |  | 80,302 |  |  | 23,278 |  |  | 22,242 |
| $ | 106,197 |  |  | $ | 102,748 |  |  | $ | 44,239 |  |  | $ | 42,707 |
Composition of Restricted Securities | The composition of restricted securities at September 30, 2018 and December 31, 2017 was as follows (in thousands):
| September 30, 2018 |  | December 31, 2017
Federal Home Loan Bank stock | $ | 665 |  |  | $ | 645 |
Federal Reserve Bank stock | 875 |  |  | 875 |
Community Bankers’ Bank stock | 50 |  |  | 50 |
| $ | 1,590 |  |  | $ | 1,570 |

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