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Loans and Allowance for Loan Losses - Summary of Individually Impaired Loans Presented by Class of Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Financing Receivable Impaired [Line Items] |  |
Unpaid Principal Balance, With no related allowance recorded | $ 3,950 | $ 2,574
Recorded Investment, With no related allowance recorded | 3,950 | 2,574
Average Balance, With no related allowance recorded | 3,253 | 2,112
Interest Income, With no related allowance recorded | 348 | 301
Unpaid Principal Balance, With an allowance recorded |  | 6,133
Recorded Investment, With an allowance recorded |  | 6,133
Average Balance, With an allowance recorded |  | 5,671
Interest Income, With an allowance recorded |  | 301
Related Allowance, With an allowance recorded |  | 1,782
Construction and Land Development |  |
Financing Receivable Impaired [Line Items] |  |
Unpaid Principal Balance, With no related allowance recorded | 293 | 303
Recorded Investment, With no related allowance recorded | 293 | 303
Average Balance, With no related allowance recorded | 298 | 309
Interest Income, With no related allowance recorded | 16 | 21
Commercial Real Estate |  |
Financing Receivable Impaired [Line Items] |  |
Unpaid Principal Balance, With no related allowance recorded | 2,287 | 2,253
Recorded Investment, With no related allowance recorded | 2,287 | 2,253
Average Balance, With no related allowance recorded | 2,270 | 1,710
Interest Income, With no related allowance recorded | 253 | 280
Commercial | SBA |  |
Financing Receivable Impaired [Line Items] |  |
Unpaid Principal Balance, With no related allowance recorded | 1,370 | 18
Recorded Investment, With no related allowance recorded | 1,370 | 18
Average Balance, With no related allowance recorded | 685 | 93
Interest Income, With no related allowance recorded | $ 79 |
Unpaid Principal Balance, With an allowance recorded |  | 3,559
Recorded Investment, With an allowance recorded |  | 3,559
Average Balance, With an allowance recorded |  | 3,559
Related Allowance, With an allowance recorded |  | $ 1,782

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