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Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Costs and Fair Values of Securities | Amortized costs and fair values of securities at March 31, 2018 and December 31, 2017 were as follows (in thousands):
| March 31, 2018
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 81,309 |  |  | $ | 24 |  |  | $ | (2,225 | ) |  | $ | 79,108 |
Obligations of states and political subdivisions | 14,820 |  |  | 57 |  |  | (286 | ) |  | 14,591 |
Total securities available for sale | $ | 96,129 |  |  | $ | 81 |  |  | $ | (2,511 | ) |  | $ | 93,699 |
Securities held to maturity: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 30,750 |  |  | $ | — |  |  | $ | (984 | ) |  | $ | 29,766 |
Obligations of states and political subdivisions | 14,541 |  |  | 18 |  |  | (192 | ) |  | 14,367 |
Corporate debt securities | 1,500 |  |  | — |  |  | (3 | ) |  | 1,497 |
Total securities held to maturity | $ | 46,791 |  |  | $ | 18 |  |  | $ | (1,179 | ) |  | $ | 45,630 |
Total securities | $ | 142,920 |  |  | $ | 99 |  |  | $ | (3,690 | ) |  | $ | 139,329 |
| 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 March 31, 2018 and December 31, 2017, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands):
| March 31, 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 | $ | 47,868 |  |  | $ | (941 | ) |  | $ | 29,121 |  |  | $ | (1,284 | ) |  | $ | 76,989 |  |  | $ | (2,225 | )
Obligations of states and political subdivisions | 7,120 |  |  | (149 | ) |  | 1,924 |  |  | (137 | ) |  | 9,044 |  |  | (286 | )
Total securities available for sale | $ | 54,988 |  |  | $ | (1,090 | ) |  | $ | 31,045 |  |  | $ | (1,421 | ) |  | $ | 86,033 |  |  | $ | (2,511 | )
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 17,269 |  |  | $ | (478 | ) |  | $ | 12,497 |  |  | $ | (506 | ) |  | $ | 29,766 |  |  | $ | (984 | )
Obligations of states and political subdivisions | 11,166 |  |  | (192 | ) |  | — |  |  | — |  |  | 11,166 |  |  | (192 | )
Corporate debt securities | 1,497 |  |  | (3 | ) |  | — |  |  | — |  |  | 1,497 |  |  | (3 | )
Total securities held to maturity | $ | 29,932 |  |  | $ | (673 | ) |  | $ | 12,497 |  |  | $ | (506 | ) |  | $ | 42,429 |  |  | $ | (1,179 | )
Total securities | $ | 84,920 |  |  | $ | (1,763 | ) |  | $ | 43,542 |  |  | $ | (1,927 | ) |  | $ | 128,462 |  |  | $ | (3,690 | )
| 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 March 31, 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 | $ | 507 |  |  | $ | 514 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 8,965 |  |  | 8,877 |  |  | 6,808 |  |  | 6,681 |
Due after five years through ten years | 12,112 |  |  | 11,721 |  |  | 13,723 |  |  | 13,534 |
Due after ten years | 74,545 |  |  | 72,587 |  |  | 26,260 |  |  | 25,415 |
| $ | 96,129 |  |  | $ | 93,699 |  |  | $ | 46,791 |  |  | $ | 45,630 |
Composition of Restricted Securities | The composition of restricted securities at March 31, 2018 and December 31, 2017 was as follows (in thousands):
| March 31, 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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