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Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Nov. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Expense from affordable housing projects, equity method investments |  | $ 1,200 | $ 300 | $ 3,100 | $ 1,400 |
Capital Bank Financial Corporation |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Term borrowings |  | 187,169 |  | $ 187,169 |  |
Junior Subordinated Debt | Capital Bank Financial Corporation |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Term borrowings |  |  |  |  |  | $ 212,400
Debt called during period |  | $ 10,300 |  |  |  |
Scenario, Forecast | Junior Subordinated Debt | Capital Bank Financial Corporation |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Debt called during period | $ 35,100 |  |  |  |  |

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- Definition Amount of investment income (loss) of qualified affordable housing project investments accounted for using the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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