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Portfolio Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 7
Pre-Modification Outstanding Recorded Balance | $ 676 | $ 12,395
Post-Modification Outstanding Recorded Balance | $ 676 | $ 12,395
Commercial and industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 1 | 4
Pre-Modification Outstanding Recorded Balance | $ 676 | $ 12,114
Post-Modification Outstanding Recorded Balance | $ 676 | $ 12,114
CRE - investor owned |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 248
Post-Modification Outstanding Recorded Balance | $ 0 | $ 248
CRE - owner occupied |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 13
Post-Modification Outstanding Recorded Balance | $ 0 | $ 13
Construction and land development |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 1
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 20
Post-Modification Outstanding Recorded Balance | $ 0 | $ 20
Residential real estate |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 0
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 0
Post-Modification Outstanding Recorded Balance | $ 0 | $ 0
Consumer and other |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | loan | 0 | 0
Pre-Modification Outstanding Recorded Balance | $ 0 | $ 0
Post-Modification Outstanding Recorded Balance | $ 0 | $ 0

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- Definition Number of 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 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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