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Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 and December 31, 2016 were as follows (in thousands):
| September 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Securities available for sale: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 78,039 |  |  | $ | 235 |  |  | $ | (767 | ) |  | $ | 77,507 |
Obligations of states and political subdivisions | 15,445 |  |  | 203 |  |  | (68 | ) |  | 15,580 |
Corporate equity securities | 1 |  |  | 14 |  |  | — |  |  | 15 |
Total securities available for sale | $ | 93,485 |  |  | $ | 452 |  |  | $ | (835 | ) |  | $ | 93,102 |
Securities held to maturity: |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 33,300 |  |  | $ | 48 |  |  | $ | (234 | ) |  | $ | 33,114 |
Obligations of states and political subdivisions | 14,576 |  |  | 239 |  |  | (1 | ) |  | 14,814 |
Corporate debt securities | 1,500 |  |  | — |  |  | (12 | ) |  | 1,488 |
Total securities held to maturity | $ | 49,376 |  |  | $ | 287 |  |  | $ | (247 | ) |  | $ | 49,416 |
Total securities | $ | 142,861 |  |  | $ | 739 |  |  | $ | (1,082 | ) |  | $ | 142,518 |
| December 31, 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 September 30, 2017 and December 31, 2016, investments in an unrealized loss position that were temporarily impaired were as follows (in thousands):
| September 30, 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 | $ | 44,941 |  |  | $ | (613 | ) |  | $ | 4,689 |  |  | $ | (154 | ) |  | $ | 49,630 |  |  | $ | (767 | )
Obligations of states and political subdivisions | 3,796 |  |  | (68 | ) |  | — |  |  | — |  |  | 3,796 |  |  | (68 | )
Total securities available for sale | $ | 48,737 |  |  | $ | (681 | ) |  | $ | 4,689 |  |  | $ | (154 | ) |  | $ | 53,426 |  |  | $ | (835 | )
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
U.S. agency and mortgage-backed securities | $ | 22,814 |  |  | $ | (234 | ) |  | $ | — |  |  | $ | — |  |  | $ | 22,814 |  |  | $ | (234 | )
Obligations of states and political subdivisions | 351 |  |  | (1 | ) |  | — |  |  | — |  |  | 351 |  |  | (1 | )
Corporate debt securities | 1,488 |  |  | (12 | ) |  | — |  |  | — |  |  | 1,488 |  |  | (12 | )
Total securities held to maturity | $ | 24,653 |  |  | $ | (247 | ) |  | $ | — |  |  | $ | — |  |  | $ | 24,653 |  |  | $ | (247 | )
Total securities | $ | 73,390 |  |  | $ | (928 | ) |  | $ | 4,689 |  |  | $ | (154 | ) |  | $ | 78,079 |  |  | $ | (1,082 | )
| December 31, 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 September 30, 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. Corporate equity securities are not included in the maturity categories in the following maturity summary because they do not have a stated maturity date.
| Available for Sale |  | Held to Maturity
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due within one year | $ | 1,952 |  |  | $ | 1,968 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 13,828 |  |  | 13,909 |  |  | 6,190 |  |  | 6,228 |
Due after five years through ten years | 12,689 |  |  | 12,652 |  |  | 14,198 |  |  | 14,342 |
Due after ten years | 65,015 |  |  | 64,558 |  |  | 28,988 |  |  | 28,846 |
Corporate equity securities | 1 |  |  | 15 |  |  | — |  |  | — |
| $ | 93,485 |  |  | $ | 93,102 |  |  | $ | 49,376 |  |  | $ | 49,416 |
Composition of Restricted Securities | The composition of restricted securities at September 30, 2017 and December 31, 2016 was as follows (in thousands):
| September 30, 2017 |  | December 31, 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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