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Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Restructured, not on non-accrual | $ 7,900 |
Impaired Financing Receivable, Related Allowance | 900 |
Non-Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 14,801 | $ 15,687
Non-accrual | 14,168 | 14,968
Restructured, not on non-accrual | 633 | 719
Impaired Financing Receivable, Related Allowance | 3,886 | 2,579
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,886 | 2,579
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 11,226 | 12,665
Non-accrual | 10,593 | 11,946
Restructured, not on non-accrual | 633 | 719
Impaired Financing Receivable, Related Allowance | 3,667 | 2,508
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 3,667 | 2,508
Non-Covered Loans | Commercial - investor owned |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 410 | 422
Non-accrual | 410 | 422
Restructured, not on non-accrual | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Non-Covered Loans | Commercial - owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 743 | 487
Non-accrual | 743 | 487
Restructured, not on non-accrual | 0 | 0
Impaired Financing Receivable, Related Allowance | 219 | 71
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 219 | 71
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 435 | 136
Non-accrual | 435 | 136
Restructured, not on non-accrual | 0 | 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, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 1,669 | 1,602
Non-accrual | 1,669 | 1,602
Restructured, not on non-accrual | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Impaired Financing Receivable, Recorded Investment | 318 | 375
Non-accrual | 318 | 375
Restructured, not on non-accrual | 0 | 0
Impaired Financing Receivable, Related Allowance | 0 | 0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 0 | $ 0

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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