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Loans (Purchased impaired loans) (Narrative) (Details) - USD ($)
$ in Millions
Jul. 07, 2017
Feb. 28, 2017
Feb. 05, 2016
Citywide Banks      
Financing Receivable, Impaired [Line Items]      
Loans $ 1,000.0    
Loans held to maturity $ 985.4    
Founders Bancorp      
Financing Receivable, Impaired [Line Items]      
Loans   $ 98.9  
Loans held to maturity   $ 96.4  
CIC Bancshares, Inc.      
Financing Receivable, Impaired [Line Items]      
Loans     $ 594.9
Loans held to maturity     $ 581.5