Fair Value - Summary of Carrying Amounts, Estimated Fair Values and Assumptions Used to Estimate Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Financial Assets: | ||
| Net loans held for investment, Carrying Amount | $ 1,103,162 | $ 1,032,418 |
| Financial Liabilities: | ||
| Interest bearing deposits | 981,974 | 900,677 |
| Carrying Amount [Member] | ||
| Financial Assets: | ||
| Net loans held for investment, Carrying Amount | 1,103,162 | 1,032,418 |
| Financial Liabilities: | ||
| Interest bearing deposits | 981,974 | 900,677 |
| Estimated Fair Value [Member] | ||
| Financial Assets: | ||
| Net loans held for investment, Fair Value | 1,101,890 | 1,029,540 |
| Financial Liabilities: | ||
| Interest bearing deposits | $ 982,380 | $ 901,211 |