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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Nov. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Expense from affordable housing projects, equity method investments $ 900 $ 500 $ 1,900 $ 1,100  
Capital Bank Financial Corp          
Variable Interest Entity [Line Items]          
Term borrowings $ 187,169   $ 187,169    
Junior Subordinated Debt | Capital Bank Financial Corp          
Variable Interest Entity [Line Items]          
Term borrowings         $ 212,400