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Allowance for Loan and Lease Losses (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]          
Loans And Leases Receivable Allowance, Covered $ 12,300,000   $ 12,300,000   $ 22,600,000
Provision (recapture) for Loan Losses, Covered (893,000) $ (15,800,000) 1,100,000 $ 20,500,000  
Allowance de-recognition due to change in policy from most recent acquisition     8,900,000    
Allowance de-recognition due to change in policy from loans acquired acquisition     73,100,000    
PREPA Line of Credit Sold Charge-off 56,200,000   56,200,000    
PREPA Line of Credit Sold Provision $ 2,900,000   $ 2,900,000