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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Nov. 30, 2017
Variable Interest Entity [Line Items]      
Income (loss) from affordable housing projects, equity method investments $ (1,000) $ (500)  
Capital Bank Financial Corp      
Variable Interest Entity [Line Items]      
Term borrowings $ 187,169    
Capital Bank Financial Corp | Junior Subordinated Debt      
Variable Interest Entity [Line Items]      
Term borrowings     $ 212,400