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Loans (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivables [Abstract]    
Loans and Leases Receivable, Description Oriental’s loan portfolio is composed of two segments, loans initially accounted for under the amortized cost method (referred to as "originated and other" loans) and loans acquired (referred to as "acquired" loans). Acquired loans are further segregated between acquired BBVAPR loans and acquired Eurobank loans.  
Financing Receivable Modifications Recorded Investment Not Included In Non Accrual $ 112.9 $ 109.2
Originated Loans Granted To Puerto Rico Government 91.4 94.9
Acquired Credit Facilities Granted to the Puerto Rico Public Corporation 44.5 50.3
Impaired Commercial Loans 82.0 72.3
Allowance for impaired commercial loans 8.4 10.6
Impaired Mortgage Loans 84.2 85.4
Allowance For Impaired Mortgage Loans 10.2 9.1
Current but placed in non-accrual due to credit deterioration $ 21.2 $ 20.1