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Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financial Assets |  |  |
Securities available for sale | $ 393,331 | $ 369,995 |
Loan yield maintenance provisions | 653 | 685 | $ 789
Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 393,331 | 369,995 |
Loan yield maintenance provisions | 653 | 685 |
Corporate bonds |  |  |
Financial Assets |  |  |
Securities available for sale | 1,234 | 1,339 |
Corporate bonds | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 1,234 | 1,339 |
Collateralized mortgage obligations |  |  |
Financial Assets |  |  |
Securities available for sale | 17,121 | 20,693 |
Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 17,121 | 20,693 |
Small Business Administration |  |  |
Financial Assets |  |  |
Securities available for sale | 14,212 | 16,706 |
Small Business Administration | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 14,212 | 16,706 |
U.S. Treasury and U.S. government sponsored entities |  |  |
Financial Assets |  |  |
Securities available for sale | 8,917 | 5,921 |
U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 8,917 | 5,921 |
State and political subdivisions |  |  |
Financial Assets |  |  |
Securities available for sale | 191,003 | 155,303 |
State and political subdivisions | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 191,003 | 155,303 |
Mortgage-backed securities - residential |  |  |
Financial Assets |  |  |
Securities available for sale | 160,450 | 169,682 |
Mortgage-backed securities - residential | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 160,450 | 169,682 |
Equity securities |  |  |
Financial Assets |  |  |
Securities available for sale | 394 | 351 |
Equity securities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 394 | 351 |
Interest rate swaps | Fair Value, Measurements, Recurring |  |  |
Financial Liabilities |  |  |
Derivative liabilities | 653 | 685 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 394 | 351 |
Loan yield maintenance provisions | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small Business Administration | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | State and political subdivisions | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 394 | 351 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps | Fair Value, Measurements, Recurring |  |  |
Financial Liabilities |  |  |
Derivative liabilities | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 392,929 | 369,632 |
Loan yield maintenance provisions | 653 | 685 |
Significant Other Observable Inputs (Level 2) | Corporate bonds | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 1,234 | 1,339 |
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 17,121 | 20,693 |
Significant Other Observable Inputs (Level 2) | Small Business Administration | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 14,212 | 16,706 |
Significant Other Observable Inputs (Level 2) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 8,917 | 5,921 |
Significant Other Observable Inputs (Level 2) | State and political subdivisions | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 191,003 | 155,303 |
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 160,442 | 169,670 |
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Interest rate swaps | Fair Value, Measurements, Recurring |  |  |
Financial Liabilities |  |  |
Derivative liabilities | 653 | 685 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 8 | 12 |
Loan yield maintenance provisions | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporate bonds | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Small Business Administration | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | State and political subdivisions | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 8 | 12 |
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring |  |  |
Financial Assets |  |  |
Securities available for sale | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Interest rate swaps | Fair Value, Measurements, Recurring |  |  |
Financial Liabilities |  |  |
Derivative liabilities | $ 0 | $ 0 |

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