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Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 1 | 0 | 1 | 1
Pre-Modification Outstanding Recorded Balance | $ 187 | $ 0 | $ 187 | $ 676
Post-Modification Outstanding Recorded Balance | $ 187 | $ 0 | $ 187 | $ 676
Commercial and industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan | 1 | 0 | 1 |
Pre-Modification Outstanding Recorded Balance | $ 187 | $ 0 |  |
Post-Modification Outstanding Recorded Balance | $ 187 | $ 0 |  |
Commercial and Industrial Sector [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | loan |  |  |  | 1
Pre-Modification Outstanding Recorded Balance |  |  | $ 187 | $ 676
Post-Modification Outstanding Recorded Balance |  |  | $ 187 | $ 676

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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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