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Portfolio Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | $ 14,968 | $ 13,060
Restructured, not on non-accrual | 719 | 2,331
Total Recorded Investment | 15,687 | 15,391
Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 11,946 | 10,046
Restructured, not on non-accrual | 719 | 2,311
Total Recorded Investment | 12,665 | 12,357
CRE - investor owned |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 422 | 435
Restructured, not on non-accrual | 0 | 0
Total Recorded Investment | 422 | 435
CRE - owner occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 487 | 231
Restructured, not on non-accrual | 0 | 0
Total Recorded Investment | 487 | 231
Construction and land development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 136 | 2,286
Restructured, not on non-accrual | 0 | 20
Total Recorded Investment | 136 | 2,306
Residential real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 1,602 | 62
Restructured, not on non-accrual | 0 | 0
Total Recorded Investment | 1,602 | 62
Consumer and other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-accrual | 375 | 0
Restructured, not on non-accrual | 0 | 0
Total Recorded Investment | $ 375 | $ 0

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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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