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Fair Value Disclosures - Assets and Liabilities Recorded on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | $ 317,416 |  |  |
Securities available for sale |  | $ 297,199 |  |
Allowance for loan losses, other real estate owned | 0 | 53 | $ 205 | $ 162
Allowance for impaired loans | 2,096 | 1,531 |  |
U.S. Government-sponsored agencies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 5,007 |  |  |
Mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 307,693 |  |  |
Securities available for sale |  | 289,989 |  |
State and political subdivisions |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 4,716 |  |  |
Securities available for sale |  | 6,769 |  |
Other equity securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale |  | 441 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Securities available for sale |  | 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 | 317,416 |  |  |
Securities available for sale |  | 297,199 |  |
Assets measured at fair value | 319,236 | 299,154 |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Securities available for sale |  | 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 | 317,416 |  |  |
Securities available for sale |  | 297,199 |  |
Assets measured at fair value | 319,236 | 299,154 |  |
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 | 1,820 | 1,955 |  |
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 | 1,820 | 1,955 |  |
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 5,007 |  |  |
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 0 |  |  |
Fair Value, Measurements, Recurring | U.S. Government-sponsored agencies | Estimate of Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Securities available for sale | 5,007 |  |  |
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 |  |  |
Securities available for sale |  | 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 | 307,693 |  |  |
Securities available for sale |  | 289,989 |  |
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 |  |  |
Securities available for sale |  | 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 | 307,693 |  |  |
Securities available for sale |  | 289,989 |  |
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 |  |  |
Securities available for sale |  | 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 | 4,716 |  |  |
Securities available for sale |  | 6,769 |  |
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 |  |  |
Securities available for sale |  | 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 | 4,716 |  |  |
Securities available for sale |  | 6,769 |  |
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 |  |
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 |  | 441 |  |
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 |  |
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 |  | 441 |  |
Fair Value, Measurements, Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other real estate owned | 584 | 1,012 |  |
Impaired loans | 7,415 | 6,521 |  |
Assets measured at fair value | 7,999 | 7,533 |  |
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 | 584 | 1,012 |  |
Impaired loans | 7,415 | 6,521 |  |
Assets measured at fair value | 7,999 | 7,533 |  |
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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