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Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 loan | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Restructured, not on non-accrual | $ 8,000 |  | $ 8,000 |  |
Impaired Financing Receivable, Related Allowance | 200 |  | 200 |  |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 17,044 |  | $ 17,044 |  | $ 15,687
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 | 1 |
Non-accrual | $ 14,935 |  | $ 14,935 |  | 14,968
Restructured, not on non-accrual | 820 |  | 820 |  | 719
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 1,289 |  | 1,289 |  |
Impaired Financing Receivable, Related Allowance | 4,314 |  | 4,314 |  | 2,579
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,314 |  | 4,314 |  | 2,579
Non-Covered Loans | Commercial and industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | $ 12,197 |  | $ 12,197 |  | 12,665
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 |  |
Non-accrual | $ 10,088 |  | $ 10,088 |  | 11,946
Restructured, not on non-accrual | 820 |  | 820 |  | 719
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 1,289 |  | 1,289 |  |
Impaired Financing Receivable, Related Allowance | 4,128 |  | 4,128 |  | 2,508
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,128 |  | 4,128 |  | 2,508
Non-Covered Loans | Commercial - investor owned |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 770 |  | 770 |  | 422
Non-accrual | 770 |  | 770 |  | 422
Restructured, not on non-accrual | 0 |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0 |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  | 0
Non-Covered Loans | Commercial - owner occupied |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 1,288 |  | 1,288 |  | 487
Non-accrual | 1,288 |  | 1,288 |  | 487
Restructured, not on non-accrual | 0 |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0 |  |
Impaired Financing Receivable, Related Allowance | 177 |  | 177 |  | 71
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 177 |  | 177 |  | 71
Non-Covered Loans | Construction and land development |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 0 |  | 0 |  | 136
Non-accrual | 0 |  | 0 |  | 136
Restructured, not on non-accrual | 0 |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0 |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  | 0
Non-Covered Loans | Residential real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 2,477 |  | 2,477 |  | 1,602
Non-accrual | 2,477 |  | 2,477 |  | 1,602
Restructured, not on non-accrual | 0 |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0 |  |
Impaired Financing Receivable, Related Allowance | 9 |  | 9 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 9 |  | 9 |  | 0
Non-Covered Loans | Consumer and other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 312 |  | 312 |  | 375
Non-accrual | 312 |  | 312 |  | 375
Restructured, not on non-accrual | 0 |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0 |  |
Impaired Financing Receivable, Related Allowance | 0 |  | 0 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 0 |  | $ 0 |  | $ 0

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