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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 loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 loan | Dec. 31, 2018 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |  |
Restructured, accruing |  | $ 3,300 |  |
Non-Covered Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 15,569 |  | $ 16,745
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 3 | 1 |
Non-accrual |  | $ 15,430 |  | 16,520
Restructured, accruing |  | 79 |  | 225
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 60 |  |
Impaired Financing Receivable, Related Allowance |  | 2,408 |  | 4,453
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 2,408 |  | 4,453
Non-Covered Loans | Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 11,433 |  | 12,950
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 |
Non-accrual |  | $ 11,409 |  | 12,805
Restructured, accruing |  | 0 |  | 145
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 24 |  |
Impaired Financing Receivable, Related Allowance |  | 2,023 |  | 4,266
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 2,023 |  | 4,266
Non-Covered Loans | Commercial - investor owned |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,637 |  | 398
Non-accrual |  | 2,637 |  | 398
Restructured, accruing |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 0 |  |
Impaired Financing Receivable, Related Allowance |  | 258 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 258 |  | 0
Non-Covered Loans | Commercial - owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 221 |  | 808
Financing Receivable, Modifications, Number of Contracts | loan |  | 1 | 0 |
Non-accrual |  | $ 221 |  | 808
Restructured, accruing |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 0 |  |
Impaired Financing Receivable, Related Allowance |  | 0 |  | 109
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0 |  | 109
Non-Covered Loans | Construction and land development |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 0 |  | 0
Non-accrual |  | 0 |  | 0
Restructured, accruing |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 0 |  |
Impaired Financing Receivable, Related Allowance |  | 0 |  | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0 |  | 0
Non-Covered Loans | Residential real estate |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 1,267 |  | 2,277
Financing Receivable, Modifications, Number of Contracts | loan |  | 2 | 0 |
Non-accrual |  | $ 1,162 |  | 2,197
Restructured, accruing |  | 79 |  | 80
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 26 |  |
Impaired Financing Receivable, Related Allowance |  | 116 |  | 52
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 116 |  | 52
Non-Covered Loans | Consumer and other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 11 |  | 312
Non-accrual |  | 1 |  | 312
Restructured, accruing |  | 0 |  | 0
Impaired Financing Receivables, Recorded Investment, 90 Days Past Due and Still Accruing |  | 10 |  |
Impaired Financing Receivable, Related Allowance |  | 11 |  | 26
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | $ 11 |  | $ 26

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