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Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis(Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 300,172 | $ 300,416 |  |
Allowance for loan losses, other real estate owned | 53 | 205 | $ 162 | $ 654
Allowance for impaired loans | 1,531 | 478 |  |
Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Interest rate swap agreements | 0 | 0 |  |
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 300,172 | 300,416 |  |
Interest rate swap agreements | 1,955 | 1,790 |  |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Interest rate swap agreements | 0 | 0 |  |
Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 300,172 | 300,416 |  |
Interest rate swap agreements | 1,955 | 1,790 |  |
Mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 289,989 | 280,604 |  |
State and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 6,769 | 16,482 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 300,172 | 300,416 |  |
Assets measured at fair value | 302,127 | 302,206 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 300,172 | 300,416 |  |
Assets measured at fair value | 302,127 | 302,206 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 0 | 0 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 1,955 | 1,790 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 0 | 0 |  |
Fair Value, Measurements, Recurring | Interest Rate Swap | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate swap agreements | 1,955 | 1,790 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 289,989 | 280,604 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Mortgage-backed securities | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 289,989 | 280,604 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 6,769 | 16,482 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | State and political subdivisions | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 6,769 | 16,482 |  |
Fair Value, Measurements, Recurring | Other equity securities | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Other equity securities | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 3,414 | 3,330 |  |
Fair Value, Measurements, Recurring | Other equity securities | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 | 0 |  |
Fair Value, Measurements, Recurring | Other equity securities | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 3,414 | 3,330 |  |
Fair Value, Measurements, Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 1,012 | 375 |  |
Impaired loans | 6,521 | 827 |  |
Assets measured at fair value | 7,533 | 1,202 |  |
Fair Value, Measurements, Nonrecurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 0 | 0 |  |
Impaired loans | 0 | 0 |  |
Assets measured at fair value | 0 | 0 |  |
Fair Value, Measurements, Nonrecurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 1,012 | 375 |  |
Impaired loans | 6,521 | 827 |  |
Assets measured at fair value | 7,533 | 1,202 |  |
Fair Value, Measurements, Nonrecurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 0 | 0 |  |
Impaired loans | 0 | 0 |  |
Assets measured at fair value | $ 0 | $ 0 |  |

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