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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Nov. 30, 2017
Variable Interest Entity [Line Items]          
Income (loss) from affordable housing projects, equity method investments $ (0.1) $ (0.9) $ (0.7) $ (1.9)  
Capital Bank Financial Corp | Junior Subordinated Debt          
Variable Interest Entity [Line Items]          
Term borrowings         $ 212.4