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Loans Receivable (Narratives) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable Line Items    
Financing Receivable Modifications Recorded Investment Not Included In Non Accrual $ 99.1 $ 98.1
Originated Loans Granted To Puerto Rico Government 136.5 136.6
Credit Facilities Granted to the Puerto Rico Public Corporation 66.1 66.2
Puerto Rico Housing Finance Authority credit facilities 10.7  
Impaired Commercial Loans 59.6 54.3
Allowance for impaired commercial loans 1.6 1.8
Impaired Mortgage Loans 88.8 91.6
Allowance For Impaired Mortgage Loans $ 8.2 $ 7.8