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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2017
Variable Interest Entities [Abstract]        
Expenses associated with LIHTC investments accounted for using the equity method $ 1,800 $ 1,800 $ 3,400  
Capital Bank Financial Corporation        
Business Acquisition [Line Items]        
Acquired junior subordinated debt       $ 187,169
Junior Subordinated Debt | Capital Bank Financial Corporation        
Business Acquisition [Line Items]        
Acquired junior subordinated debt       $ 212,400