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Fair Value Measurements - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | $ 162,957 | $ 159,051 | $ 158,392
Equity securities with readily determinable fair values | 1,743 | 0 | $ 0
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 1,784 |
Equity securities with readily determinable fair values | 1,743 |  |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 162,957 | 157,267 |
Equity securities with readily determinable fair values | 0 |  |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Equity securities with readily determinable fair values | 0 |  |
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 1,784 |
Equity securities with readily determinable fair values | 1,743 |  |
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 162,957 | 157,267 |
Equity securities with readily determinable fair values | 0 |  |
Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Equity securities with readily determinable fair values | 0 |  |
Recurring | U.S. Government and agencies | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | U.S. Government and agencies | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 122,076 | 104,083 |
Recurring | U.S. Government and agencies | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | Mortgage-backed securities, residential | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | Mortgage-backed securities, residential | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 31,091 | 34,833 |
Recurring | Mortgage-backed securities, residential | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | State and municipal | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | State and municipal | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 9,790 | 13,294 |
Recurring | State and municipal | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 0 | 0 |
Recurring | Corporate bonds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Recurring | Corporate bonds | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 5,057 |
Recurring | Corporate bonds | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Recurring | CRA mutual fund | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 1,035 |
Recurring | CRA mutual fund | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Recurring | CRA mutual fund | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Recurring | Stock in other banks | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 749 |
Recurring | Stock in other banks | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Recurring | Stock in other banks | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 0 |
Nonrecurring | Collateral dependent impaired loans | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 0 | 0 |
Nonrecurring | Collateral dependent impaired loans | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 0 | 0 |
Nonrecurring | Collateral dependent impaired loans | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 3,907 | 5,426 |
Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 162,957 | 159,051 |
Equity securities with readily determinable fair values | 1,743 |  |
Fair Value | Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 162,957 | 159,051 |
Equity securities with readily determinable fair values | 1,743 |  |
Fair Value | Recurring | U.S. Government and agencies |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 122,076 | 104,083 |
Fair Value | Recurring | Mortgage-backed securities, residential |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 31,091 | 34,833 |
Fair Value | Recurring | State and municipal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale | 9,790 | 13,294 |
Fair Value | Recurring | Corporate bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 5,057 |
Fair Value | Recurring | CRA mutual fund |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 1,035 |
Fair Value | Recurring | Stock in other banks |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities available for sale |  | 749 |
Fair Value | Nonrecurring | Collateral dependent impaired loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | $ 3,907 | $ 5,426 |

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