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Allowance for Loan and Lease Losses (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Allowance, Covered $ 11.9 $ 22.6  
Provision (recapture) for Loan Losses, Covered 1.1 $ 17.7 $ 5.7
Allowance de-recognition due to change in policy from most recent acquisition 10.0    
Allowance de-recognition due to change in policy from loans acquired acquisition 74.4    
PREPA Line of Credit Sold Charge-off 56.2    
PREPA Line of Credit Sold Provision $ 2.9