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Acquisitions and Divestiture (Narrative) (Details)
$ in Millions
Mar. 09, 2018
USD ($)
Apr. 28, 2017
USD ($)
Mar. 10, 2017
USD ($)
entity
Jul. 13, 2018
USD ($)
Harrison Finance Company [Member]        
Business Acquisition [Line Items]        
Loss from sale of consumer finance subsidiary $ 1.1      
Proceeds from sale of finance subsidiary $ 78.9      
FNBC I [Member] | Whitney Bank [Member]        
Business Acquisition [Line Items]        
Number of branches | entity     9  
Net of cash acquired     $ 323.0  
Cash paid     326.0  
Cash acquired     3.0  
Acquisition, Premium amount to pay     $ 41.6  
FNBC II [Member] | Whitney Bank [Member]        
Business Acquisition [Line Items]        
Cash received   $ 800.0    
Cash acquired   158.0    
Premium payment   35.0    
Unpaid principal balance of the loans acquired, Net liabilities assumed   $ 642.0    
Capital One [Member] | Subsequent Event [Member]        
Business Acquisition [Line Items]        
Assets under management       $ 4,000.0
Assets under management and administration       10,400.0
Cash for customer deposit liabilities assumed       $ 217.0